Chapter 27

Chapter 27 - Chapter 27 Prokaryotes February 8, 2008 1)...

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Chapter 27 Prokaryotes – February 8, 2008 1) Structural, Functional, and Genetic Adaptations contribute to prokaryotic success a) Prokaryotes are unicellular i) Some colonial forms b) Range in size from 1 – 5 micrometers i) Thiomargarita namibiensis (750 micrometers) c) No membrane-bound organelles d) Circular chromosomes 2) Prokaryotic Domains a) Comparison of traits found in the Domains Bacteria and Archaea 3) Prokaryotic Cells have a variety of shapes a) The three most common are spheres (cocci), rods (bacilli), and spirals (spirilli) 4) Cell-Surface Structures a) Cell Wall i) Maintains cell shape, provides physical protection, prevents cell from bursting in a hypotonic environment ii) Composed of peptidoglycan iii) May also have an outer phospholipids membrane b) Capsule i) A sticky layer of polysaccharides or protein that may cover the cell wall of many prokaryotes ii) Fimbriae and pilli allow prokaryotes to stick to their substrate or other individuals in a colony c) Motility
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Chapter 27 - Chapter 27 Prokaryotes February 8, 2008 1)...

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