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Jeff State Micro Prokaryotic cell
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Terms in this set (76)
Prokaryotic cell structure
Flagella, Pili and fimbriae, Glycocalyx
Prokaryotic cell Motility
Flagellum
Prokaryotic cell Attachement or Channel
Pilus, Fimbira
Flagella
(tail for movement)Bacterial Propellers
Monotrichous
single flagellum
Lophotrichous
small bunches or tufts of flagella emerging from the same site
Amphitrichous
flagella at both poles of the cell.
Peritrichous
flagella are dispersed randomly over the surface of the cell.
Three main parts of the flagella
basal body, hook, and filament.
Chemotaxis
- to detect and move in response to chemical signals.
Chemotaxis Positive signals
cells to move toward them
Chemotaxis Negative
cells to move away from them
Pilus and Fimbria
Provide adhesion but not locomotion
Fimbriae
small, bristlelike fibers sprouting from the surface of many bacterial cells
Fimbriae help
bacteria to stick to one another ... Pathogenesis
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Discuss the following problem. Mortality due to lung cancer was followed in groups of males in the United Kingdom for 50 years. The cumulative risk of dying from lung cancer as a function of age and smoking habits for four groups of males: those who never smoked, those who stopped at age 30, those who stopped at age 50, and those who continued to smoke. These data show clearly that individuals can substantially reduce their cumulative risk of dying from lung cancer by stopping smoking. What do you suppose is the biological basis for this observation?
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Of the three animals you have observed in this chapter—emperor penguins, earthworms, and isopods, which has the most complex ecological behavior? Based on what you learned in earlier chapters about these animals, why do you think this might be?
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List four physical properties of each of the following: (a) a piece of copper wire (b) 500 g of butter (c) a glass of milk (d) a candle (e) a piece of aluminum foil (f) a spoonful of sugar (g) toothpaste
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What structural adaptation allows pterophytes to grow larger than bryophytes?
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