Cell Theory
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The document outlines the development of the Cell Theory from early microscope observations of cells in the 1600s to the modern understanding. Key contributors include Hooke, who first observed cells; Leeuwenhoek, who observed single-celled organisms; Schleiden and Schwann, who concluded that plants and animals are made of cells; and Virchow, who stated that new cells come from existing cells. The Cell Theory states that all living things are composed of cells, cells are the basic unit of life, and new cells arise from existing cells. Cells come in various shapes and sizes but all have a cell membrane, DNA, cytoplasm, and organelles. There are two main types of cells - eukaryotic cells with
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1) The document outlines the key discoveries that led to the development of the Cell Theory.
2) In the late 1500s, early microscopes were used to examine cloth and pond water, with Leeuwenhoek first observing living microorganisms.
3) In 1665, Robert Hooke used a microscope to study cork and coined the term "cell" to describe its tiny chambers.
(10) the cell theory 12 13.pptx
1) The document outlines the key discoveries that led to the development of the Cell Theory.
2) In the late 1500s, early microscopes were used to examine cloth and pond water, with Leeuwenhoek first observing living microorganisms.
3) In 1665, Robert Hooke used a microscope to examine plant tissues and described the compartments as "cells".
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Cell Theory
- 1. The Cell Theory A Timeline
- 2. Late 1500’s • Hans and Zacharias Janssen • Dutch lens grinders, father and son • produced first compound microscope (2 lenses) Late 1500’s
- 3. Robert Hooke ( 1665) • Used light microscope to look at thin slices of plant tissues -- cork • Looked empty, like monk’s chamber • Called tiny chambers “cells”
- 4. • Looked at pond water organisms • First to see living microscopic organisms. • Made careful sketches. Anton von Leeuwenhoek (1673)
- 5. Matthias Schleiden -- 1838 • German Botanist (studied plants) • Viewed plant parts under a microscope • Discovered that plant parts are made of cells • He concluded: “All plants are made of
- 6. Theodore Schwann -- 1839 • German scientist who studied animals - zoologist • Saw that all animals he studied were cellular so concluded: “All animals are made of cells.”
- 7. Rudolf Virchow - 1855 • German physician who studied cell reproduction • “Where a cell exists, there must have been a preexisting cell.”
- 8. The Cell Theory • All living things are composed of one or more cells. • The cell is the basic unit of life in all living things. • New cells are produced from existing cells.
- 9. Cell Similarities • Cells come in many shapes and sizes with different duties but … • All are surrounded with a cell membrane • All cells have hereditary material (DNA) • All have cytoplasm and organelles. Cytoplasm is the fluid within a cell which provides a safe environment for the organelles. Organelles are the structures within the cell that have specific duties to make the cell a functioning unit.
- 10. Two Types of Cells • Eukaryotic • Are complex and of different types. • Have a nucleus and many organelles. • Contain more DNA due to different jobs within the cell. DNA is linear (in a line). • Possess a cell membrane or a cell wall. • All living things other than bacteria.
- 12. Two Types of Cells • Prokaryotic • Contain no nucleus. • Have no membrane covered organelles, but do have ribosomes to make protein. • Possess circular DNA. • Are bacteria.