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The document discusses the cell theory, which has three main parts: 1) the cell is the basic unit of life, 2) all living things are made of cells, and 3) cells come from pre-existing cells. Many scientists contributed to the development of the cell theory, including Anton van Leeuwenhoek who invented the first microscope and observed bacteria and protists, Robert Hooke who observed "cells" in cork, and Theodor Schwann and Matthais Schleiden who stated that plants and animals are made of cells, respectively. Rudolph Virchow further discovered that all cells come from pre-existing cells, cementing the cell theory.
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Cell theory
The cell theory states that (1) the cell is the basic unit of life, (2) all living things are made of cells, and (3) cells come from pre-existing cells. Key scientists who contributed to the development of the cell theory include Anton van Leeuwenhoek who first observed bacteria and cells under a microscope, Robert Hooke who observed "cells" in cork, Theodor Schwann and Matthais Schleiden who stated that all living things are made of cells, and Rudolph Virchow who discovered that all cells come from pre-existing cells.
Cell Theory
1. The cell theory states that the cell is the basic unit of life, all living things are made of cells, and cells come from pre-existing cells.
2. Anton van Leeuwenhoek invented the first microscope and was the first to observe bacteria and protists. Matthais Schleiden and Theodor Schwann contributed to the cell theory by stating that plants and animals are made of cells, respectively.
3. Rudolph Virchow completed the cell theory by discovering that cells can only arise from pre-existing cells.
7.1 cell discovery and theory
The microscope enabled the discovery of cells. In 1665, Hooke observed box-shaped structures in cork which he called "cells". Van Leeuwenhoek later saw living organisms in pond water and milk using an improved microscope. In the 1830s, scientists established that plants and animals are composed of cells, and that cells only arise from pre-existing cells (Cell Theory). Modern compound and electron microscopes allow detailed study of prokaryotic and eukaryotic cell structures and organelles.
The Cell Theory
The Cell Theory states that:
1) All living things are made of one or more cells.
2) The cell is the basic unit of structure and function in living things.
3) All cells come from pre-existing cells.
Unit 3 - 7.1 Cell Discovery and Theory
The microscope enabled the discovery that all living things are made of cells. In 1665, Robert Hooke used a simple microscope to observe box-shaped structures in cork that he called "cells". In the late 1600s, Anton van Leeuwenhoek used an improved microscope to observe living organisms in pond water and milk. Over subsequent decades, scientists including Matthias Schleiden, Theodor Schwann, and Rudolf Virchow contributed observations that led to the accepted Cell Theory - that all living things are composed of cells, cells are the basic unit of structure, and cells come from pre-existing cells. More advanced microscopes like electron microscopes have since allowed scientists to study cells in even greater detail.
CellTheoryTimeline.ppt
1. The document outlines the timeline and key contributors to the development of the cell theory. It describes the work of early scientists like Aristotle, Hooke, Leeuwenhoek, Schleiden, and Schwann who provided evidence that all living things are made up of cells.
2. Key developments included Hooke observing "cells" in cork in 1665 using an early microscope, and the work of Schleiden and Schwann in the 1830s demonstrating that plants and animals are composed of cells.
3. The cell theory was fully established in 1858 by Rudolf Virchow, who stated that new cells only arise from pre-existing cells, completing the three main principles of the cell theory.
Demo cell theory
The document summarizes the history and development of cell theory. It discusses key scientists from the 1600s-1800s like Hooke, Van Leeuwenhoek, Schleiden, and Schwann and their discoveries using early microscopes. Their findings established that all living things are made of cells, cells are the basic unit of life, and cells come from pre-existing cells, which became known as the Cell Theory.
Microsopes
Electron microscopes allow magnification of objects up to 1 million times, enabling the first observations of cells in the 1600s and bacteria in the 1600s. The cell theory was developed in the 1800s concluding that all living things are made of cells, cells are the basic functional unit of life, and new cells are produced from existing cells.
Recommended
Cell theory
The cell theory states that (1) the cell is the basic unit of life, (2) all living things are made of cells, and (3) cells come from pre-existing cells. Key scientists who contributed to the development of the cell theory include Anton van Leeuwenhoek who first observed bacteria and cells under a microscope, Robert Hooke who observed "cells" in cork, Theodor Schwann and Matthais Schleiden who stated that all living things are made of cells, and Rudolph Virchow who discovered that all cells come from pre-existing cells.
Cell Theory
1. The cell theory states that the cell is the basic unit of life, all living things are made of cells, and cells come from pre-existing cells.
2. Anton van Leeuwenhoek invented the first microscope and was the first to observe bacteria and protists. Matthais Schleiden and Theodor Schwann contributed to the cell theory by stating that plants and animals are made of cells, respectively.
3. Rudolph Virchow completed the cell theory by discovering that cells can only arise from pre-existing cells.
7.1 cell discovery and theory
The microscope enabled the discovery of cells. In 1665, Hooke observed box-shaped structures in cork which he called "cells". Van Leeuwenhoek later saw living organisms in pond water and milk using an improved microscope. In the 1830s, scientists established that plants and animals are composed of cells, and that cells only arise from pre-existing cells (Cell Theory). Modern compound and electron microscopes allow detailed study of prokaryotic and eukaryotic cell structures and organelles.
The Cell Theory
The Cell Theory states that:
1) All living things are made of one or more cells.
2) The cell is the basic unit of structure and function in living things.
3) All cells come from pre-existing cells.
Unit 3 - 7.1 Cell Discovery and Theory
The microscope enabled the discovery that all living things are made of cells. In 1665, Robert Hooke used a simple microscope to observe box-shaped structures in cork that he called "cells". In the late 1600s, Anton van Leeuwenhoek used an improved microscope to observe living organisms in pond water and milk. Over subsequent decades, scientists including Matthias Schleiden, Theodor Schwann, and Rudolf Virchow contributed observations that led to the accepted Cell Theory - that all living things are composed of cells, cells are the basic unit of structure, and cells come from pre-existing cells. More advanced microscopes like electron microscopes have since allowed scientists to study cells in even greater detail.
CellTheoryTimeline.ppt
1. The document outlines the timeline and key contributors to the development of the cell theory. It describes the work of early scientists like Aristotle, Hooke, Leeuwenhoek, Schleiden, and Schwann who provided evidence that all living things are made up of cells.
2. Key developments included Hooke observing "cells" in cork in 1665 using an early microscope, and the work of Schleiden and Schwann in the 1830s demonstrating that plants and animals are composed of cells.
3. The cell theory was fully established in 1858 by Rudolf Virchow, who stated that new cells only arise from pre-existing cells, completing the three main principles of the cell theory.
Demo cell theory
The document summarizes the history and development of cell theory. It discusses key scientists from the 1600s-1800s like Hooke, Van Leeuwenhoek, Schleiden, and Schwann and their discoveries using early microscopes. Their findings established that all living things are made of cells, cells are the basic unit of life, and cells come from pre-existing cells, which became known as the Cell Theory.
Microsopes
Electron microscopes allow magnification of objects up to 1 million times, enabling the first observations of cells in the 1600s and bacteria in the 1600s. The cell theory was developed in the 1800s concluding that all living things are made of cells, cells are the basic functional unit of life, and new cells are produced from existing cells.
Lesson 2 discovering the cell 2015
1) In the 16th and 17th centuries, early microscopists like Janssen, Leewenhoek, and Hooke began observing and describing cells using microscopes.
2) Hooke was the first to use the term "cell" to describe the basic units that make up living things.
3) In the early 19th century, scientists in Germany developed the cell theory, which stated that all living things are made of one or more cells, cells are the basic unit of life, new cells are produced from existing cells, and cells can function independently.
4) The development of the electron microscope in the 1930s allowed scientists to view cells and their internal structures in much greater detail.
Cell history and_theory
Cells are the basic unit of all living things and were first observed in the 17th century with the invention of the microscope. Key figures in early cell study include Anton van Leeuwenhoek who developed the first microscope, Robert Hooke who coined the term "cell", and Robert Brown who discovered the nucleus. The cell theory was developed from the work of Schleiden, Schwann, and Virchow and states that 1) the cell is the basic unit of life, 2) all living things are made of cells, and 3) all new cells come from existing cells.
Information about the cell
The document discusses the history of cell discovery. Robert Hooke first observed cells in 1665 using a microscope to examine cork. Later, Robert Brown discovered the nucleus in 1833. In 1838, Matthias Schleiden and Theodor Schwann discovered that plants and animals respectively are composed of cells. In 1855, Rudolf Virchow proposed that all cells come from preexisting cells, debunking the theory of spontaneous generation. The combined work of these scientists formed the Cell Theory, which states that all living things are composed of cells, cells are the basic unit of life, and all cells come from preexisting cells.
1. cell theory
The document discusses the early discoveries around cell theory. It describes several scientists' contributions: Robert Hooke observed tiny compartments in cork under a microscope in 1665 and named them cells. Anton van Leeuwenhoek later observed red blood cells, sperm cells, and single-celled organisms using microscopes. Robert Brown discovered the cell nucleus in 1831 and studied Brownian motion. Matthias Schleiden stated in 1838 that plants are composed of cells, while Theodor Schwann later concluded the same for animals. Their joint work formed the basis of the first cell theory - that all living things are composed of one or more cells.
Cell theory
The development of the cell theory involved contributions from several scientists using microscopes. Robert Hooke first observed cells when examining cork through a microscope in 1665 and coined the term "cell". Anton van Leeuwenhoek later discovered single-celled organisms which he called "animalcules" while examining pond water with a microscope. In the 1830s, Matthias Schleiden and Theodor Schwann concluded that plants and animals, respectively, are composed of cells. Their work established that cells are the fundamental unit of all living things.
Cell discovery & cell theory
The document discusses the history and key figures in the discovery and establishment of the cell theory. It notes that cells were first observed in the 1600s using early microscopes. Key contributors included Hooke, who first observed cells in cork in 1665 and coined the term "cell", and van Leeuwenhoek who observed single-celled organisms in pond water in the 1670s. In the 1830s, Schleiden and Schwann established that plants and animals are composed of cells, respectively, and Schwann proposed the original cell theory. Virchow later expanded on this in 1858 by stating that all cells come from pre-existing cells.
Life Is Cellular
Cells are the basic structural and functional units of life. In the 17th-18th centuries, advances in microscope technology allowed scientists like Hooke and van Leeuwenhoek to observe cells. In 1838, Schleiden and Schwann proposed the Cell Theory - that all living things are composed of cells, cells are the basic unit of structure and function, and new cells are produced from existing cells. The Cell Theory was a major unifying concept in biology and changed views of life by introducing a more materialistic, reductionist perspective.
cell.pptx
The basic functional unit of life is the cell. Robert Hooke first observed cells in 1665 when examining a piece of cork under an early microscope. He saw many tiny compartments that reminded him of monk's cells, so he called them cells. Later scientists like Antonie van Leeuwenhoek observed bacteria and other microorganisms using improved microscopes. Over centuries, scientists discovered that cells are the fundamental unit of structure and function for both plants and animals, eventually formulating the cell theory. Today, cells remain the focus of extensive research that has led to advances in fields like stem cell therapy and personalized medicine.
cell theory.pptx
Cell theory states that all living things are made of cells, cells are the basic unit of structure and function, and all cells come from pre-existing cells. Key contributors included Robert Hooke, who first observed cells under a microscope in 1665, Matthias Schleiden who concluded that plants are made of cells in 1838, and Theodore Schwann who found that animals are also made of cells in 1839. They combined with Rudolf Virchow to develop the three tenets of cell theory: 1) all organisms are composed of cells, 2) the cell is the basic functional unit, and 3) all cells come from pre-existing cells. Modern interpretations retain these concepts and also recognize cells contain DNA and RNA and
A. The development of the has allowed us to study cells and their pro.pdf
A. The development of the has allowed us to study cells and their processes 1. T a. Resolution is
the ability ofamicroscope to show two objects as separate Magnification is how much larger an
object appears compared to its actual size a Light microscopes are the kind we use in lab. They
function by having visible light pass through an object, and then glass lenses enlarge the object.
b. Electron microscopes use beams of electrons. They have better resolving and magnification
capabilities that allow us to see organelles and their parts. 3. Cell Theory states that all living
things & come from other cells. This theory developed as a result of contributions of 5 people
van Leeuwenhoek- 1 microscope in the 17 century b. Robert Hooke was the first person to use
the term cell to describe the basic structure of living organisms. When observing cork he noticed
that it was full of small room like structures. These structures resembled the cells that monks
lived in thus he coined the term cell in relationship Schleiden-plants are composed ofcells to
living organisms. d Schwann-animals are composed of cells e. Virchow-cells don\'t just appear
they come from preexisting cells. B. Two major classes of cells. which is coiled in region where
the nuc leus would be if the cell had a nucleus. This group includes the archaea and bacteria have
a true nucleus which is bordered by a double membrane called the nuclear enve lop. This group
includes the protists, fungi, plants, and animals collectively known as the Eukarya.
Characteristics of eukaryot ic cells A. Cytoplasm is the space in a cell between the It contains
organelles within a fluid called B. Membrane Structure and Function 1. The serves as the border
of the cell. Its unique structure allows it to regulate what enters and exits a cell, for this reason it
is oft called the gate keeper 2. Membrane Structure pecialized lipids known as make up most of
the membrane. These structures have a or water loving head that is made of a phosphate group
and two x I N
Solution
1. Developmet of microscope enabled the study of cells. Microscopes are two types light or
compound microscope and electronic microscope.
2. In a compound light microscope the high power objective lens comes close to the specimen to
magnify the image. Transmission electron microscopy (TEM) depends on the electron beam of
short wavelength to illuminate the internal structures of microorganisms. The electron beam
penetrates into the specimen and magnifies 1nm object up to 500,000X. In scanning electron
microscopy (SEM) the specimen is coated with a thin layer of heavy metal like gold or
palladium. The narrow beam of electrons probe back and forth of the metal coated specimen.
The secondary electrons that are scattered back give the image of the specimen which is
displayed on the screen.
3. According to cell theory living things are composed of one or more cells. Anton von
Leeuwenhoek (1632-1723) is considered as “Father of Microbiology”. He was the f.
1__Cell_Theory.pptx
In biology, cell theory is a scientific theory first formulated in the mid-nineteenth century, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells.
Celltheory and its types
Robert Hooke was the first to observe cells in 1665 when he examined a thin section of cork under a microscope. He saw structures that resembled a honeycomb and called them cells. Later, in 1674, Anton van Leeuwenhoek discovered tiny living things in pond water using a microscope. Over time, the observations of many scientists led to the development of the Cell Theory: (1) all living things are made of cells, (2) cells are the basic units of structure and function, and (3) new cells are produced from existing cells.
introduction to Celltheory
Robert Hooke was the first to observe cells in 1665 when he examined a thin section of cork under a microscope. He saw structures that resembled a honeycomb and called them cells. Later, in 1674, Anton van Leeuwenhoek discovered tiny living things in pond water using a microscope. Over time, the observations of many scientists led to the development of the Cell Theory: (1) all living things are made of cells, (2) cells are the basic units of structure and function, and (3) new cells are produced from existing cells.
The Cell theory
This presentation you will get how the cell theory developed.
Robert Hooke observed cells in cork and coined the term "cells”.
Anton Van Leeuwenhoek observed first living cells under the simple microscope.
Matthias Schleiden (1838) German lawyer turned botanist, concluded that, despite differences in the structure of various tissues, plants were made of cells and that the plant embryo arose from a single cell.
In 1839, Theodor Schwann, a German zoologist and colleague of Schleiden’s, published a comprehensive report on the cellular basis of animal life. Schwann concluded that the cells of plants and animals are similar structures.
By 1855, Rudolf Virchow, a German pathologist concluded that
“Omnis cellula e cellula”- new cells are formed only from pre-existing cells.
All organisms are composed of one or more cells.
2) The cell is the structural unit of life.
3) Cells can arise only by division from a pre-existing cell
Cell Theory
The document discusses cell theory, which has three main tenets: 1) All organisms are composed of one or more cells, 2) The cell is the basic unit of life, and 3) All cells come from preexisting cells. It describes the early discoveries of cells by Hooke, van Leuwenhoek, Schleiden, and Schwann that led to the development of cell theory. It also briefly explains different types of microscopes used to study cells, such as compound, scanning electron, and transmission electron microscopes.
History of cells
Robert Hooke was the first to describe cells in 1665 after observing cork under a microscope. He described them as "little boxes" or "little rooms". Almost 200 years later, Matthias Schleidan and Theodor Swann concluded that all plants and animals respectively are made up of cells. They along with Rudolf Vichrow wrote the three part Cell Theory: (1) all organisms are made of cells, (2) the cell is the basic unit of life, and (3) all cells come from preexisting cells.
Introduction to Cells
This document provides an overview of cells including:
- A brief history of cell discovery from Hooke's first observation of cells in cork in 1665 to Virchow observing cell division in 1855.
- The three statements that make up Cell Theory: all living things are made of cells, new cells are produced from existing cells, and cells are the basic unit of life.
- An introduction to specialized cell types and tissues in multicellular organisms including stem cell differentiation.
- An agenda for an introductory lecture on cells covering guided notes, videos, and assignments.
Cells
The document discusses the history and development of the cell theory and microscopy. It describes how early scientists like Hooke, Van Leeuwenhoek, Brown, Schleiden, and Schwann made important discoveries using early microscopes that contributed to the formulation of the cell theory. The cell theory states that all living things are made up of cells, cells are the basic unit of structure and function, and cells come from pre-existing cells. The document also provides an overview of different types of microscopes, including optical, electron, transmission, scanning electron, and x-ray microscopes.
Discovery of cells
Robert Hooke was the first to observe cells in 1665 under a microscope, noting their honeycomb-like structure and calling them "cellulae". Anton van Leeuwenhoek later discovered living cells in 1688 using an improved microscope. The body of plants and animals being made of cells was discovered by Schleiden and Schwann respectively. Virchow found that new cells only arise from pre-existing cells. Schleiden and Schwann formulated the cell theory stating that all organisms are made of cells, which are the basic structural and functional units of life.
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The electron transport chain (ETC) transfers electrons from electron donors like NADH to electron acceptors like oxygen via redox reactions. This creates a proton gradient across the inner mitochondrial membrane, which drives the synthesis of ATP. The ETC consists of four complexes - I, II, III, and IV - located in the inner mitochondrial membrane. As electrons pass from one complex to the next, protons are pumped from the matrix to the intermembrane space. Complex I oxidizes NADH, Complex II oxidizes FADH2, and Complexes III and IV pass electrons to oxygen to produce water. The proton gradient powers ATP synthase to phosphorylate ADP to ATP, providing energy for cellular work.
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Lesson 2 discovering the cell 2015
1) In the 16th and 17th centuries, early microscopists like Janssen, Leewenhoek, and Hooke began observing and describing cells using microscopes.
2) Hooke was the first to use the term "cell" to describe the basic units that make up living things.
3) In the early 19th century, scientists in Germany developed the cell theory, which stated that all living things are made of one or more cells, cells are the basic unit of life, new cells are produced from existing cells, and cells can function independently.
4) The development of the electron microscope in the 1930s allowed scientists to view cells and their internal structures in much greater detail.
Cell history and_theory
Cells are the basic unit of all living things and were first observed in the 17th century with the invention of the microscope. Key figures in early cell study include Anton van Leeuwenhoek who developed the first microscope, Robert Hooke who coined the term "cell", and Robert Brown who discovered the nucleus. The cell theory was developed from the work of Schleiden, Schwann, and Virchow and states that 1) the cell is the basic unit of life, 2) all living things are made of cells, and 3) all new cells come from existing cells.
Information about the cell
The document discusses the history of cell discovery. Robert Hooke first observed cells in 1665 using a microscope to examine cork. Later, Robert Brown discovered the nucleus in 1833. In 1838, Matthias Schleiden and Theodor Schwann discovered that plants and animals respectively are composed of cells. In 1855, Rudolf Virchow proposed that all cells come from preexisting cells, debunking the theory of spontaneous generation. The combined work of these scientists formed the Cell Theory, which states that all living things are composed of cells, cells are the basic unit of life, and all cells come from preexisting cells.
1. cell theory
The document discusses the early discoveries around cell theory. It describes several scientists' contributions: Robert Hooke observed tiny compartments in cork under a microscope in 1665 and named them cells. Anton van Leeuwenhoek later observed red blood cells, sperm cells, and single-celled organisms using microscopes. Robert Brown discovered the cell nucleus in 1831 and studied Brownian motion. Matthias Schleiden stated in 1838 that plants are composed of cells, while Theodor Schwann later concluded the same for animals. Their joint work formed the basis of the first cell theory - that all living things are composed of one or more cells.
Cell theory
The development of the cell theory involved contributions from several scientists using microscopes. Robert Hooke first observed cells when examining cork through a microscope in 1665 and coined the term "cell". Anton van Leeuwenhoek later discovered single-celled organisms which he called "animalcules" while examining pond water with a microscope. In the 1830s, Matthias Schleiden and Theodor Schwann concluded that plants and animals, respectively, are composed of cells. Their work established that cells are the fundamental unit of all living things.
Cell discovery & cell theory
The document discusses the history and key figures in the discovery and establishment of the cell theory. It notes that cells were first observed in the 1600s using early microscopes. Key contributors included Hooke, who first observed cells in cork in 1665 and coined the term "cell", and van Leeuwenhoek who observed single-celled organisms in pond water in the 1670s. In the 1830s, Schleiden and Schwann established that plants and animals are composed of cells, respectively, and Schwann proposed the original cell theory. Virchow later expanded on this in 1858 by stating that all cells come from pre-existing cells.
Life Is Cellular
Cells are the basic structural and functional units of life. In the 17th-18th centuries, advances in microscope technology allowed scientists like Hooke and van Leeuwenhoek to observe cells. In 1838, Schleiden and Schwann proposed the Cell Theory - that all living things are composed of cells, cells are the basic unit of structure and function, and new cells are produced from existing cells. The Cell Theory was a major unifying concept in biology and changed views of life by introducing a more materialistic, reductionist perspective.
cell.pptx
The basic functional unit of life is the cell. Robert Hooke first observed cells in 1665 when examining a piece of cork under an early microscope. He saw many tiny compartments that reminded him of monk's cells, so he called them cells. Later scientists like Antonie van Leeuwenhoek observed bacteria and other microorganisms using improved microscopes. Over centuries, scientists discovered that cells are the fundamental unit of structure and function for both plants and animals, eventually formulating the cell theory. Today, cells remain the focus of extensive research that has led to advances in fields like stem cell therapy and personalized medicine.
cell theory.pptx
Cell theory states that all living things are made of cells, cells are the basic unit of structure and function, and all cells come from pre-existing cells. Key contributors included Robert Hooke, who first observed cells under a microscope in 1665, Matthias Schleiden who concluded that plants are made of cells in 1838, and Theodore Schwann who found that animals are also made of cells in 1839. They combined with Rudolf Virchow to develop the three tenets of cell theory: 1) all organisms are composed of cells, 2) the cell is the basic functional unit, and 3) all cells come from pre-existing cells. Modern interpretations retain these concepts and also recognize cells contain DNA and RNA and
A. The development of the has allowed us to study cells and their pro.pdf
A. The development of the has allowed us to study cells and their processes 1. T a. Resolution is
the ability ofamicroscope to show two objects as separate Magnification is how much larger an
object appears compared to its actual size a Light microscopes are the kind we use in lab. They
function by having visible light pass through an object, and then glass lenses enlarge the object.
b. Electron microscopes use beams of electrons. They have better resolving and magnification
capabilities that allow us to see organelles and their parts. 3. Cell Theory states that all living
things & come from other cells. This theory developed as a result of contributions of 5 people
van Leeuwenhoek- 1 microscope in the 17 century b. Robert Hooke was the first person to use
the term cell to describe the basic structure of living organisms. When observing cork he noticed
that it was full of small room like structures. These structures resembled the cells that monks
lived in thus he coined the term cell in relationship Schleiden-plants are composed ofcells to
living organisms. d Schwann-animals are composed of cells e. Virchow-cells don\'t just appear
they come from preexisting cells. B. Two major classes of cells. which is coiled in region where
the nuc leus would be if the cell had a nucleus. This group includes the archaea and bacteria have
a true nucleus which is bordered by a double membrane called the nuclear enve lop. This group
includes the protists, fungi, plants, and animals collectively known as the Eukarya.
Characteristics of eukaryot ic cells A. Cytoplasm is the space in a cell between the It contains
organelles within a fluid called B. Membrane Structure and Function 1. The serves as the border
of the cell. Its unique structure allows it to regulate what enters and exits a cell, for this reason it
is oft called the gate keeper 2. Membrane Structure pecialized lipids known as make up most of
the membrane. These structures have a or water loving head that is made of a phosphate group
and two x I N
Solution
1. Developmet of microscope enabled the study of cells. Microscopes are two types light or
compound microscope and electronic microscope.
2. In a compound light microscope the high power objective lens comes close to the specimen to
magnify the image. Transmission electron microscopy (TEM) depends on the electron beam of
short wavelength to illuminate the internal structures of microorganisms. The electron beam
penetrates into the specimen and magnifies 1nm object up to 500,000X. In scanning electron
microscopy (SEM) the specimen is coated with a thin layer of heavy metal like gold or
palladium. The narrow beam of electrons probe back and forth of the metal coated specimen.
The secondary electrons that are scattered back give the image of the specimen which is
displayed on the screen.
3. According to cell theory living things are composed of one or more cells. Anton von
Leeuwenhoek (1632-1723) is considered as “Father of Microbiology”. He was the f.
1__Cell_Theory.pptx
In biology, cell theory is a scientific theory first formulated in the mid-nineteenth century, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells.
Celltheory and its types
Robert Hooke was the first to observe cells in 1665 when he examined a thin section of cork under a microscope. He saw structures that resembled a honeycomb and called them cells. Later, in 1674, Anton van Leeuwenhoek discovered tiny living things in pond water using a microscope. Over time, the observations of many scientists led to the development of the Cell Theory: (1) all living things are made of cells, (2) cells are the basic units of structure and function, and (3) new cells are produced from existing cells.
introduction to Celltheory
Robert Hooke was the first to observe cells in 1665 when he examined a thin section of cork under a microscope. He saw structures that resembled a honeycomb and called them cells. Later, in 1674, Anton van Leeuwenhoek discovered tiny living things in pond water using a microscope. Over time, the observations of many scientists led to the development of the Cell Theory: (1) all living things are made of cells, (2) cells are the basic units of structure and function, and (3) new cells are produced from existing cells.
The Cell theory
This presentation you will get how the cell theory developed.
Robert Hooke observed cells in cork and coined the term "cells”.
Anton Van Leeuwenhoek observed first living cells under the simple microscope.
Matthias Schleiden (1838) German lawyer turned botanist, concluded that, despite differences in the structure of various tissues, plants were made of cells and that the plant embryo arose from a single cell.
In 1839, Theodor Schwann, a German zoologist and colleague of Schleiden’s, published a comprehensive report on the cellular basis of animal life. Schwann concluded that the cells of plants and animals are similar structures.
By 1855, Rudolf Virchow, a German pathologist concluded that
“Omnis cellula e cellula”- new cells are formed only from pre-existing cells.
All organisms are composed of one or more cells.
2) The cell is the structural unit of life.
3) Cells can arise only by division from a pre-existing cell
Cell Theory
The document discusses cell theory, which has three main tenets: 1) All organisms are composed of one or more cells, 2) The cell is the basic unit of life, and 3) All cells come from preexisting cells. It describes the early discoveries of cells by Hooke, van Leuwenhoek, Schleiden, and Schwann that led to the development of cell theory. It also briefly explains different types of microscopes used to study cells, such as compound, scanning electron, and transmission electron microscopes.
History of cells
Robert Hooke was the first to describe cells in 1665 after observing cork under a microscope. He described them as "little boxes" or "little rooms". Almost 200 years later, Matthias Schleidan and Theodor Swann concluded that all plants and animals respectively are made up of cells. They along with Rudolf Vichrow wrote the three part Cell Theory: (1) all organisms are made of cells, (2) the cell is the basic unit of life, and (3) all cells come from preexisting cells.
Introduction to Cells
This document provides an overview of cells including:
- A brief history of cell discovery from Hooke's first observation of cells in cork in 1665 to Virchow observing cell division in 1855.
- The three statements that make up Cell Theory: all living things are made of cells, new cells are produced from existing cells, and cells are the basic unit of life.
- An introduction to specialized cell types and tissues in multicellular organisms including stem cell differentiation.
- An agenda for an introductory lecture on cells covering guided notes, videos, and assignments.
Cells
The document discusses the history and development of the cell theory and microscopy. It describes how early scientists like Hooke, Van Leeuwenhoek, Brown, Schleiden, and Schwann made important discoveries using early microscopes that contributed to the formulation of the cell theory. The cell theory states that all living things are made up of cells, cells are the basic unit of structure and function, and cells come from pre-existing cells. The document also provides an overview of different types of microscopes, including optical, electron, transmission, scanning electron, and x-ray microscopes.
Discovery of cells
Robert Hooke was the first to observe cells in 1665 under a microscope, noting their honeycomb-like structure and calling them "cellulae". Anton van Leeuwenhoek later discovered living cells in 1688 using an improved microscope. The body of plants and animals being made of cells was discovered by Schleiden and Schwann respectively. Virchow found that new cells only arise from pre-existing cells. Schleiden and Schwann formulated the cell theory stating that all organisms are made of cells, which are the basic structural and functional units of life.
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- 2. TheCell Theory The developmentand refinement of magnifying lenses and light microscopes made the observation and description of microscopic organisms and living cells . possible
- 3. TheCell Theory Many scientists contributed to thecell theory
- 4. TheCell Theory 3 : parts to the cell theory 1. Thecell is thebasic unitof life 2. All living things aremadeof cells 3. - Cells comefrompre existing cells
- 5. Anton van Leeuwenheok (1632-1723) He invented the . firstmicroscope Dutch scientist who was the first to see bacteria . and protists
- 7. (1635-1703) RobertHooke He observed thatcork has small regular boxes in itthat he called . “cells”
- 9. Theodor Schwann and Matthais Schleiden stated thatall living things . (1839) are made of cells Matthais Schleiden ( ) plants Theodor Schwann ( ) animals
- 10. (1821-1902) Rudolph Virchow German scientist who discovered thatall cells come from - pre existing . cells
- 11. TheCell Theory Continued advances in microscopy allowed observation of cell . organelles and structure
- 12. Electron Microscopes ( ): Scanning Electron Microscope SEM bounces electrons off of a whole - 3- gold coated sample to create vivid D images ( ): Transmission Electron Microscope TEM bounces electrons off of a sliced sample to create very detailed images
- 13. ... Questions ? Who used the firstmicroscope Who said thatplants were made of ? cells ? Who coined the term“cell” Who said thatall animals were made ? of cells Who said thatcells mustcome from ? existing cells
- 14. ... Statethecell theory Thecell is thebasic unitof structure. Thecell is thebasic unitof function. - All cells arisefrompre existing cells.