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Theory and Membrane Biology Chapter 4 Section 1

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Presentation on theme: "Theory and Membrane Biology Chapter 4 Section 1"— Presentation transcript:

1 Theory and Membrane Biology Chapter 4 Section 1
The Cell Theory and Membrane Biology Chapter 4 Section 1

2 Objectives Describe the discovery of the cell
Know the important discoveries that led to the cell theory Relate the properties of the cell membrane (plasma membrane) to its structure

3 Cell Theory First recorded view by Robert Hooke in 1665
Cork structures look like monks' cells

4 Cell Theory Antonie van Leeuwenhoek viewed living cells in 1674
Named moving objects in pond water animalcules (little animals)‏ Henri Dutrochet—1837 “The cell is the fundamental element of organization.” Matthias Schleiden—1837 All plants are composed of cells that come from other plant cells

5 Cell Theory Theodor Schwann—1838
Animals have cells and those come from other animal cells Schleiden and Schwann: All living things have at least one cell (VIDEO) Rudolf Virchow—1858 Cells come from pre-existing cells (refutes spontaneous generation)‏

6 Cell Theory All living things have at least one cell
The cell is the basic unit of structure and function in organisms All cells are produced from other cells Video

7 All Cells Cell membrane Cytoplasm Usually live in fluid environment

8 Plasma Membrane Also called cell membrane
Controls what goes into and comes out of cell Selectively permeable

9 Plasma Membrane Lipid bilayer made of phospholipids
Phosphate portion is attracted to water, while tails of fatty acid are repelled by water

10 Plasma Membrane Proteins extend through structure to enable transport
Glycolipids and cholesterols help maintain shape and function

11 Fluid Mosaic Model Proposed by S. J. Singer and Garth Nicolson
Proteins are free to move around in fluid phospholipid layer

12 Cell Theory All living things have at least one cell
The cell is the basic unit of structure and function in organisms All cells are produced from other cells Video

13 Other Membranes Internal cell structures (organelles)‏
Membrane composition and structure differs slightly for organelles Function depends on structure

14 Cell membrane VIDEO

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