BIOL125_Ch4 Review

BIOL125_Ch4 Review - BIOL 125 (Microbiology) Review Chapter...

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BIOL 125 (Microbiology) Review Chapter 4: Survey of Prokaryotic Cells and Microorganisms WRITING TO LEARN (Text Page 118) 1a. Name several general characteristics that could be used to define the prokaryotes. 1b. Do any other microbial groups besides bacteria have prokaryotic cells? 1c. What does it mean to say that bacteria are ubiquitous? In what habitats are they found? Give some general means by which bacteria derive nutrients. 1d. Label the parts of the bacterial cell and write a brief description (counterclockwise from top left). Glycocalyx – coating of macromolecules; used for protection and/or sticking to environment. Cytoplasm – fluid encased by cell membrane. Pilus – rigid tube made of pilin protein; utilized in conjugation. Outer Membrane – thin layer of peptidoglycan with lipopolysaccharides and lipoproteins; helps to control molecules entering and leaving the cell. Bacterial Actin – helps to stabilize shape. Flagellum – appendage for motility; three parts: filament, hook, and basal body. Inclusions – internal storage locations. Ribosomes – made of rRNA and protein; location for protein synthesis. Cell Membrane – lipid bilayer with proteins embedded; site for energy reactions, nutrient processing, and synthesis. Cell Wall – made of peptidoglycan; provides structure and shape. Nucleoid – contains the cell’s DNA; is not contained within a membrane. Fimbriae – most contain protein; used for sticking to other cells or a surface.
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BIOL125_Ch4 Review - BIOL 125 (Microbiology) Review Chapter...

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