2010 bio 113 (1)

2010 bio 113 (1) - Chapter 6: A Tour of the Cell Important...

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Chapter 6: A Tour of the Cell
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Important Point:
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Most Cells are Small Note relative size of bacteria (~1/10 size of animal/plant cells) Frog eggs 100-times & chicken egg 1000- times larger than most plant and animal cells Note relative size of nucleated cells Note relative size of viruses (~1/1000 size of animal/plant cells)
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More Size Comparisons “…any one cell embodying as it does the record of a billion years of evolution, represents more an historical than a physical event…. You cannot expect to explain so wise an old bird in a few simple words.” Max Delbrück (as quoted by Stent, in Max Delbrück, 1906-1981, 1982, Genetics 101:1-16) Cells are membrane -enclosed, DNA- containing, metabolizi ng, and self- replicating
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Surface-to-Volume Ratio Rate of “stuff” movement across membranes can be limited by amounts of membrane: solved by smaller cells or with more membrane
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A Prokaryotic Cell No nucleus Typically no membrane- bound organelles
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Plasma Membrane Surrounds cytoplasm, a.k.a., cytoplasmic membrane More in Ch. 7 Defines the limits of individual cells
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An Animal Cell (typical) See (and memorize) p. 100 for descriptions
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A Plant Cell (typical) See (and memorize) p. 101 for descriptions You should know what all of these things are as presented in these figures in your book
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Compartmentalization Eukaryotic cells are full of membrane- enclosed compartments These separate incompatible chemical and physical conditions That way, for example, proteins can be both synthesized and hydrolyzed within a single cell
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Endomembrane System error Surrounds cytoplasm, a.k.a., cytoplasmic membrane
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This note was uploaded on 12/02/2011 for the course BIO 113 taught by Professor Swenson during the Fall '08 term at Ohio State.

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2010 bio 113 (1) - Chapter 6: A Tour of the Cell Important...

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