Chapter 4 - Chapter 4- Cells: the working units of life...

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Chapter 4- Cells: the working units of life What features of cells make them the fundamental unit of life? Section 4.1 1. Cell theory- cells are the fundamental units of life, all organisms are comprised of cells, and all cells come from preexisting cells. 2. Surface area to volume ratio- as surface area increases, volume increase. Volume- amount of chemical activity it carries out per unit of time. Surface area- amount of substances the cell can take in from the outside and water it can release. As it grows larger, it needs more food and has more waste. 3. Microscopes- increase resolution- distance apart two objects must be in order for the eye to distinguish them as separate. a. Light microscope- glass lens and visible light. 1,000 times the human eye. b. Electron microscope- use electgromagnets to focus an electron beam. About 1,000,000 times the human eye. 4. Plasma membrane- composed of phospholipid bilayer which the heads facing the cells aqueous interior and extracellular environment on the other. Can maintain a constant
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This note was uploaded on 01/26/2011 for the course BIO 0150 taught by Professor Roberts during the Fall '09 term at Pittsburgh.

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Chapter 4 - Chapter 4- Cells: the working units of life...

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