07-08-08 - Concept 27.1 Structural functional and genetic...

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07-08-08 Concept 27.1 Structural functional and genetic adaptations contribute to the prokaryotic success A. Characteristics a. Prokaryotes are unicellular i. Come colonial forms b. Range in size from 1-5 um c. No membrane bound organelles d. Circular chromosomes B. Prokaryotic Domains a. Comparison of the traits found in the domain Bacteria and Archaea b. Table 27.2 (don’t memorize) C. Prokaryotic cells have a variety of shapes a. The 3 most common are spheres (cocci), rods (bacilli), and spirals (spirlli) D. Cell surface structures a. Cell Wall i. Maintains cell shape, provides physical protection, prevents cell from bursting into a hypotonic environment ii. Composed of peptioglycan in bacteria iii. May also have an outer phospholipids membrane E. Cell-Surface Structures a. A capsule (sticky layer of polysaccharide or protein) may cover the wall of many prokaryotes b. Fimbriae and Pilli allow prokaryotes to stick to their substrate or other individuals in a colony F. Motility a. Motile bacteria move by means of flagella i. Structurally different from eukaryotic flagella
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