BIOL 1202 : Test 2 Notes
Document Summary
Clicker: 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: some colonial forms, range in size from 1-5 micrometers, exception: thiomargarita namibiensis (750 micrometers, 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) Gram-negative bacteria- have a thin layer of peptidoglycan. Gram-positive bacteria- have a thick layer of peptidoglycan. Clicker: gram-negative bacteria have ____ peptidoglycan than gram- positive cells and their cell walls are _______ complex structurally: less; more. In a heterogeneous environment bacteria exhibit taxis (ability to move toward or away from certain stimuli: e. g. , positive chemotaxis- moving toward a chemical stimulus. Internal organization: prokaryotes do not have membrane-bound organelles, some do have specialized membranes that perform metabolic functions. Clicker: groups of staphylococcus aureus look like _____: clusters of grapes.
