BIOL 200 Chapter Notes - Chapter 4: Robert Hooke, Cell Membrane, Cell Theory

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All organisms are composed of one or more cells. Cells are the smallest living things (basic units of organization) Diffusion of things in and out of the cell. True/false: organisms made of many small cells have an advantage over an organism composed of fewer, larger cells. What happens to the volume and surface area as a cell"s size increases. The volume increases much more rapidly than the surface area because the distance to the plasma membrane increases, and the relative amount of plasma membrane decreases. The minimum distance two points can be apart and still be distinguished as two separate points. Light microscopes- use magnifying lenses with visible light. They resolve structures that are 200 nm apart. Have 1000 times the resolving power of light microscopes. Nucleoids or nucleus where dna is located. A thin rigid fiber made of protein that protrudes from the cell surface. Purpose is to attach a bacterial cell to other cells or other structures.

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