Chapter 27

Chapter 27 - Chapter27:Prokaryotes

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Chapter 27: Prokaryotes One thing that E. Coli and other bacteria have in common with eukaryotes  is the presence of ribosomes. Concept 27.1: Structural and functional adaptations contribute to  prokaryotic success Prokaryotes are unicellular o Some colonial forms Range in size from 1-5 micrometers o Thiomargarita namibiensis  (750 micrometers) No membrane-bound organelles Circular chromosomes Prokaryotic cells have a variety of shapes o The three most common are spheres (cocci), rods (bacilli), and  spirals (spirilli)  o Figure 27.2  o Groups of staphylococci look like clusters of grapes. (spherical) Cell-Surface Structures o Cell wall Maintains cell shape, provides physical protetection, prevents  cell from busting in a hypotonic environment Composed of peptidoglycan in bacteria May also have an outer phospholipid membrane Figure 27.3  Gram-negative bacteria have less peptidoglycan than gram- positive cells and their cell walls are more complex structurally. o
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Chapter 27 - Chapter27:Prokaryotes

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