Prokaryotes

Prokaryotes - P rokaryotes Chapter 27 Concept 27.1:...

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Prokaryotes Chapter 27 Concept 27.1: Structural and functional adaptations contribute to prokaryotic success - Prokaryotes are unicellular 1. Some colonial forms - Range in size from 1-5 um 1. Thiomargarita namibiensis (750 um) - No membrane-bound organelles - Circular chromosomes Prokaryotic cells have a variety of shapes - The three most common are spheres (cocci), rods(bacilli), and spirals(spirilli) Cell-Surface Structures - Cell wall 1. Maintains cell shape, provides physical protection, prevents cell from bursting in a hypotonic environment 2. Composed of peptidoglycan in bacteria 3. May also have an outer phospholipid membrane - A capsule ( a sticky layer of polysaccharide or protein) may cover the cell wall of many prokaryotes - Fimbriae and pilli allow prokaryotes to stick to their substrate of other individuals in a colony Motility - Motile bacteria move by means of flagellae 1. Structurally different from eukaryotic flagella - In a heterogeneous environment bacteria exhibit taxis (ability to move toward
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This note was uploaded on 03/27/2010 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Prokaryotes - P rokaryotes Chapter 27 Concept 27.1:...

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