biology-117

biology-117 - www.biology.brookscole.com Prokaryotic Cells...

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www.biology.brookscole.com Prokaryotic Cells Archaea and eubacteria DNA is not in the nucleus No membrane-bound organelles Bacteria Nothing is completely compartmentalized Cytoplasm and ribosomes Unicellular Eukaryotic Cells Have nucleus and membrane-bound organelles Can refer to a whole organism, or just the cells DNA enclosed in a membrane, envelope Plant cell- chloroplasts, central vacuole Animal cell- centrioles, absence of chloroplasts, cell walls, central vacuoles Multicellular Plasma Membrane Defines the cell as a distinct entity Made up of phospholipids The plasma membrane surrounding cell Lipid Bilayer- gives the membrane its fluid properties Danielli’s unit membrane hypothesis (1940)- o based on all membranes being alike, being a unity o Structure to the membrane
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o Looks like a pumpernickel, cream cheese sandwich 1. Lipid layer 2. Pores- Cell does not behave as if it is completely covered in lipids, so they must have Pores. If it was all lipid covered, water could not let water in or out (not the case). Sieve Theory 3. Various ions pass with differential ease: Charge 4. Different properties include wettability. Hydrophilic. There must be a
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biology-117 - www.biology.brookscole.com Prokaryotic Cells...

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