Biol 101 17 January 2008

Biol 101 17 January - Biol 101 17 January 2008(Late Prokaryotic Cells o Archaea and eubacteria o DNA is not in nucleus o No membrane-bound

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Biol 101 17 January 2008 (Late) Prokaryotic Cells o Archaea and eubacteria o DNA is not in nucleus o No membrane-bound organelles o Live and operate as individual cells; sometimes joined together in group Eukaryotic cells: have nucleus and membrane-bound organelles (“eukaryotic” can refer to a cell or an organism) o Have DNA in nucleus – double membrane (envelope) Cytoplasm Plasma membrane Defines the cell as a distinct entity Made up of phospholipids – lipid bilayer that gives the membrane its fluid properties Danielle’s unit membrane hypothesis (1940) – based on all membranes’ being alike, unity to membranes o Lipid layer o Pores = Sieve Theory (the cell does not behave as if it were completely filled with lipids; otherwise, water couldn’t go in and out) there must be holes (pores) in the membrane; the cell acts like a sieve o Various ions pass with differential ease: charge o Different properties include wettability (hydrophilic) = protein layer
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This note was uploaded on 03/29/2008 for the course BIOL 101 taught by Professor Hogan during the Spring '08 term at UNC.

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Biol 101 17 January - Biol 101 17 January 2008(Late Prokaryotic Cells o Archaea and eubacteria o DNA is not in nucleus o No membrane-bound

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