Chapter 6(1) - Chapter 6 A Tour of the Cell 6.1-6.5 Cell...

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Unformatted text preview: Chapter 6 A Tour of the Cell 6.1-6.5 Cell Fractionation Centrifugation Takes cells apart and separates the organelles. Correlate structure with function. Prokaryotic Cell Structures Prokaryotes Bacteria no membrane-bound nucleus ONE circular chromosome in their cytoplasm Cell walls contain peptidoglycan Divide by BINARY FISSION Lack membrane-enclosed organelles DNA is not associated with histones Structures External to the Cell Wall Capsule contributes to VIRULENCE *Protect bacteria from the host immune system stealth bomber Flagella Function - Motility Taxis movement toward (+) or away from (-) a stimulus Chemotaxis Phototaxis 3 parts filament, hook basal body Filament (consists of protein, flagellin) H antigens in typing some bacteria e.g. E. coli O157:H7 Fimbriae Attachment to other cells and surfaces VIRULENCE factor Neisseria gonorrheae STRUCTURES INTERNAL TO THE CELL WALL Plasma Membrane (inner membrane) Fluid Mosaic Model composed of Phospholipids and Proteins peripheral and integral Phospholipid bilayer Water soluble head end (phosphate) Hydrophobic hydrocarbon tails Cell Membrane Functions Selective Barrier Selectively Permeable Allows small molecules, water,oxygen, carbon dioxide, simple sugars to pass through...
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This note was uploaded on 03/20/2012 for the course BIOLOGY 1305 taught by Professor Adair during the Spring '09 term at Baylor.

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Chapter 6(1) - Chapter 6 A Tour of the Cell 6.1-6.5 Cell...

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