The document discusses the structure and functions of cells. It begins by summarizing the discovery of cells in the 17th century by Robert Hooke and the development of the cell theory in the 19th century. It then defines the cell as the basic unit of life and discusses variations in cell number, shape, and size between organisms. The main parts of the cell are then described in detail, including the cell membrane, cytoplasm, nucleus, and various organelles. Key differences between plant and animal cells are also highlighted.
Most relevant information about the cell, its discovery, types and various kinds of organelles and their function. it also focus on how molecules are transported across the cell membrane.
2018/2019
The word cell is derived from the Latin word “cellula” which means “a little room”
It was the British botanist Robert Hooke who, in 1664, while examining a slice of bottle cork under a microscope, found its structure resembling the box-like living quarters of the monks in a monastery, and coined the word “cells”
Most relevant information about the cell, its discovery, types and various kinds of organelles and their function. it also focus on how molecules are transported across the cell membrane.
2018/2019
The word cell is derived from the Latin word “cellula” which means “a little room”
It was the British botanist Robert Hooke who, in 1664, while examining a slice of bottle cork under a microscope, found its structure resembling the box-like living quarters of the monks in a monastery, and coined the word “cells”
All living things are made from one or more cells. A cell is the simplest unit of life and they are responsible for keeping an organism alive and functioning. This lesson to cells is the starting point for the area of biology that studies the various types of cells and how they work.
In this lesson you will learn about :
1) What is a Cell?
2) The Invention of the Microscope and the Discovery of Cell.
3) Cell Theory.
4) Cells - Number, Size, Shape and Function.
5) Structure of a Cell
6) Prokaryotic and Eukaryotic Cells.
7) The Plant and Animal cells.
8) Stem Cells.
I hope this document is helpful to you. Please share the document with your friends if you think this will benefit them. Get ready for the next lesson. Thanks.
Cells are the basic structural units and the building blocks of all living organisms.
Discovery of the Cell- Cell was discovered by Robert Hooke in 1665 after observing a piece of cork under a magnifying device.
Robert Hooke coined the term “cell”.
Schleiden and Schwann proposed the cell theory. According to cell theory.
Cells are the basic structural and functional units of life.
All living organisms are made up of one or more cells.
New cells arise from pre-existing cells
Chapter 15
The basic unit of life
Characteristics of Life
Macromolecules Needed for Life
Cell Types: Prokaryotic and Eukaryotic
The Microscope
Tour of a Eukaryotic Cell
The Cell Membrane
Transport into and out of Cells
Cell Communication
How Cells Reproduce
How Cells Use Energy
ATP and Chemical Reactions in Cells
Photosynthesis
Cellular Respiration and Fermentation
Cytoplasm is a gel like fluid present between the plasma membrane and the nucleus
Cytoplasm is the semi-fluid substance of a cell that is present within the cellular membrane and surrounds the nuclear membrane
It is sometimes described as the nonnuclear content of the protoplasm
All living things are made from one or more cells. A cell is the simplest unit of life and they are responsible for keeping an organism alive and functioning. This lesson to cells is the starting point for the area of biology that studies the various types of cells and how they work.
In this lesson you will learn about :
1) What is a Cell?
2) The Invention of the Microscope and the Discovery of Cell.
3) Cell Theory.
4) Cells - Number, Size, Shape and Function.
5) Structure of a Cell
6) Prokaryotic and Eukaryotic Cells.
7) The Plant and Animal cells.
8) Stem Cells.
I hope this document is helpful to you. Please share the document with your friends if you think this will benefit them. Get ready for the next lesson. Thanks.
Cells are the basic structural units and the building blocks of all living organisms.
Discovery of the Cell- Cell was discovered by Robert Hooke in 1665 after observing a piece of cork under a magnifying device.
Robert Hooke coined the term “cell”.
Schleiden and Schwann proposed the cell theory. According to cell theory.
Cells are the basic structural and functional units of life.
All living organisms are made up of one or more cells.
New cells arise from pre-existing cells
Chapter 15
The basic unit of life
Characteristics of Life
Macromolecules Needed for Life
Cell Types: Prokaryotic and Eukaryotic
The Microscope
Tour of a Eukaryotic Cell
The Cell Membrane
Transport into and out of Cells
Cell Communication
How Cells Reproduce
How Cells Use Energy
ATP and Chemical Reactions in Cells
Photosynthesis
Cellular Respiration and Fermentation
Cytoplasm is a gel like fluid present between the plasma membrane and the nucleus
Cytoplasm is the semi-fluid substance of a cell that is present within the cellular membrane and surrounds the nuclear membrane
It is sometimes described as the nonnuclear content of the protoplasm
Cell Definition
What is a Cell?
Discovery of Cells
Who discovered cells?
Characteristics of Cells
Types of Cells
Prokaryotic Cells
Eukaryotic Cells
Cell Structure
Cell Membrane
Cell Wall
Cytoplasm
Nucleus
Cell Organelles
Functions of Cell
Cell Theory
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Home assignment II on Spectroscopy 2024 Answers.pdf
Cell (The function and structural unit of life) Class-8th
1. The Cell –
Its Structure
And Functions
[In Detail]
1May 29, 2015
2. The Discovery Of A Cell
Cells emerged on Earth at least 3.5 billion
years ago. In 1655, the English scientist
Robert Hooke made an observation that
would change basic biological theory and
research forever. While examining a dried
section of cork tree with a crude light
microscope, he observed small chambers and
named them as cells.
After 175 years, research led to the
formation of the cell theory. In its modern
form, this theorem has four basic parts:
I. 1. The cell is the basic structural and
functional unit of life; all organisms are
composed of cells.
II. 2. All cells are produced by the division of
pre-existing cells. Each cell contains genetic
material that is passed down during this
process.
III. 3. All basic chemical and physiological
functions are carried out inside of cells.
IV. 4. The activities of cells depends on the
activities of subcellular structures within the
cell.
What is a Cell ?
The cell (from Latin cella, meaning “small
room”)is the basic structural, functional and
biological unit of all known living organisms.
Cells are the smallest unit of life that
can reproduce independently, and are often
called the "building blocks of life". The study of
cells is called cell biology. 2
3. Variation In Cell Number, Shape And Size In
Living Organisms
Cell Number
Human body has trillions of cells which vary in
shapes and sizes. Different groups of cells
perform a variety of functions. living organisms
can be classified into two categories-
a) Organisms made of more than one cell are
called multicellular organisms. For example,
human beings ,animals etc.
b) The single-celled organisms are called
unicellular organisms. For example, amoeba,
euglena etc.
The both type organism can performs all the
necessary functions for their existence.
Cell Shape
Generally, cells are round, spherical or elongated.
Some cells are long and pointed at both ends.
They exhibit spindle shape . Cells sometimes are
quite long. Some are branched like the nerve cell
or a neuron.
Cell Size
Cell vary in size. The smallest cell is PPLO(Pleuro
pneumonia-like organism)and is about 0.1µm in
diameter. The ostrich egg is the largest cell with
1,70,000µm in diameter.
3
4. Part Of The Cell
4
Cell
Membrane
• Cell Wall
Cytoplasm
Nucleus
• Nucleoplasm
• Chromosomes
• DNA
5. Cell Membrane
The cell membrane (also known as the plasma membrane or cytoplasmic
membrane) is a biological membrane that separates the interior of
all cells from the outside environment. It also surrounds the inner gel-like
material called protoplasm. It controls the entry and the exit of substance
according to the requirements of the cell.
The cell wall is a tough, flexible but sometimes fairly rigid layer that
surrounds plant cells. It is located outside the cell membrane and provides
plant cells with structural support and protection.
Cytoplasm
The cytoplasm comprises cytosol – the gel-like substance enclosed within
the cell membrane – and the organelles – the cell's internal sub-structures.
All of the contents of the cells are contained within the cytoplasm. The
cytoplasm is made up of carbohydrates, proteins, fats, minerals vitamins and
about 80% water and usually colourless.
In plants, movements of the cytoplasm around vacuoles are known
as cytoplasmic streaming.
5
6. Nucleus
The nucleus is the most important
part of the cell as it controls the
functions and activities of the cell. It
is lies in the centre of the cell but it
also occupy peripheral positions.
The nucleus is bound by a nuclear
membrane. The protoplasm present
in the nucleus is called nucleoplasm.
It has a thread-like network called
chromatin. When the cell divides it
condenses to form, a thread-like
structure called chromosomes. The
number of chromosomes in human
beings is 46(23 pairs of
chromosomes).
Chromosomes contain genetic
material, organized as multiple long
linear DNA (deoxyribonucleic
acid)molecules in complex with a
large variety of proteins.
6
8. Plastids
The plastid is a major organelle found in
the cells of plants and algae. Plastids are the
site of manufacture. They often contain
pigments used in photosynthesis, and the types
of pigments present can change or determine
the cell's colour.
Mitochondrion
The mitochondrion (plural mitochondria) is
a membrane-bound organelle. These are rod
shape or spherical structures. These structures
are described as "cellular power plants"
because they generate most of the cell's supply
of adenosine triphosphate (ATP).
Endoplasmic Reticulum
The endoplasmic reticulum (ER) is a type
of organelle in the cells that forms an
interconnected network of flattened. There
are two types of endoplasmic reticulum, rough
endoplasmic reticulum (RER) and smooth
endoplasmic reticulum (SER). It works as
skeletal framework for the cell.
8
9. Golgi Apparatus
The Golgi apparatus, also known as
the Golgi complex is an organelle found in
the cells. It was identified in 1897 by the
Italian physician Camillo Golgi. The Golgi
apparatus packages proteins inside the
cell before they are sent to their
destination; it is important in the
processing of proteins for secretion.
Vacuole
A vacuole is a membrane-
bound organelle which is present in all
types cells. Vacuoles are essentially
enclosed compartments which are filled
with water containing inorganic and
organic molecules. The organelle has no
basic shape or size; its structure varies
according to the needs of the cell.
Ribosomes
The ribosome is a large and complex
molecular machine, found within all living
cells, that help in protein synthesis.
9
10. Some of the cells have small organelles
on their cell membrane, which help them
in transportation and collection of food.
Two of them are-
Flagellum
A flagellum is a lash-like appendage that
protrudes from the cell body of
certain cells like Euglena. The primary
role of the flagellum is locomotion but it
also often has function as a
sensory organelle, being sensitive to
chemicals and temperatures outside the
cell.
Cilium
A cilium is an organelle found
in unicellular cells like Paramecium. Cilia
are slender protuberances that project
from the much larger cell body.
10
11. Sr.
no.
Part of a Cell Plant Cells Animal Cells
1. Cell Membrane Present Present
2. Nucleus & Nucleus Membrane Present Present
3. Cytoplasm Present Present
4. Cell Wall Present Absent
5. Plastids Present Absent
6. Vacuole Present (Large in size) Present (Small in size)
11
13. 13
The basic unit of structure and
function in living things.
Made up of cells that are similar in structure and
function and which work together to perform a
specific activity.
Made up of tissues that work together to
perform a specific activity.
Groups of two or more tissues that work
together to perform a specific function for
the organism.
Entire living things that can
carry out all basic life
processes.