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Eukaryotic%20cellsS09

Eukaryotic%20cellsS09 - EUKARYOTIC CELLS Chapter4...

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EUKARYOTIC CELLS Chapter 4
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EUKARYOTES True, membrane-bound nucleus DNA  organized into chromosomes DNA associated with basic proteins Membrane-bound organelles Larger and more complex than prokaryotes SIZE: 10-100 um in diameter Microorganisms: Algae, Fungi, Protozoa Other: Higher Plants and Animals
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FLAGELLA FUNCTION = Locomotion Some protozoa and algae Surrounded by cytoplasmic membrane Contains 9 pairs of microtubles in a ring PLUS 2 single  microtubules in the center, 9+2 array Moves in a wave like manner Few per cell and relatively long
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Microtubules   Tubulin 9 pairs + 2 array Figure 4.23c Flagella and Cilia
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CILIA FUNCTION = move foreign material  Same structure as flagella, but shorter Hundreds per cell Some protozoa and animal cells
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CELL WALL Eukaryotic cell walls = rigid polysaccharide Cellulose - all plants and some fungi Chitin (NAG polymer) - most fungi Glucan & mannan - yeasts Pellicle - protective covering of protozoa NO PEPTIDOGLYCAN therefore NOT susceptible to penicillin,  etc.
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GLYCOCALYX FUNCTIONS Strengthen membrane Attach cells together (ADHESINS) Cell-cell recognition Animal cells CHO, glycolipids, glycoproteins
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PLASMA (CYTOPLASMIC) MEMBRANE FUNCTION = External covering of the cell Phospholipid bilayer Integral and peripheral proteins CHOs, glycoproteins = cell surface receptors Contains sterols (cholesterol, ergosterols)
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