Lecture 4

Lecture 4 - Connects at two points within the cell and...

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Explain the importance of being small Surface area to volume ratio is grater the smaller you are Describe the various microbial shapes and names Streptobacilli – lots of rods connected Coccobacillus (coccus) – round Vibrio – comma shaped Spirillum – curvy Spirochete - corkscrew Explain flagella distribution Polar Monotrichous – one flagella at the end Polar Amphitrichous – one flagella at each end Polar Lophotrichous – a group of flagella at one end Peritrichous – flagella all over the body Compare and contrast; Fimbriae and Pili Fimbriae – short and solid, used for adherence, stick to surface of cells Pili – long and hollow, used for DNA exchange or motility (movement) Explain flagellar structure and action Basal body – attaches flagella to cell and acts like the motor Hook – Attaches fagetin to basal body Fagetin – subset of proteins that make up the flagella Describe the endoflagellum
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Unformatted text preview: Connects at two points within the cell and works like a muscle contracting and relaxing to cause a spin motion Compare and contrast; capsule, slime and S-layer Capsule Organized and difficult to remove, made from polysaccharides (Glycocalyx) Slime Disorganized and easy to remove, made from polysaccharides (Glycocalyx) S-layer Organized, self-assembled Glycoprotein Describe Biofilms and gliding motility Biofilms immobile polysaccharide material that allows microbes to reproduce Gliding Slime is excreted from the cell and pushes the cell forward as it hydrates Describe and compare; Positive and Negative Chemotaxis, Phototaxis and Aerotaxis Chemotaxis movement towards a favorable place, amino acids or sugars, positive movement away from an unfavorable place, weak asic/base, negative Phototaxis movement towards and away from light Aerotaxis movement towards and away from oxygen...
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This note was uploaded on 04/01/2008 for the course MB 351 taught by Professor Keen during the Spring '08 term at N.C. State.

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