E-PolyLearning

96. Which of the following is incorrect?
a. Mammalian cells are larger and more complex than microorganisms
b. Their growth rate is very fast compared to microorganisms
c. Mammalian cells are fragile
d. Most animal cells only grow when attached to surface
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Answer: (b).Their growth rate is very fast compared to microorganisms

97. The size of a single plant cell is usually within the range of
a. 10-20μm in diameter and 25-100μm long
b. 20-40μm in diameter and 100-200μm long
c. 40-60μm in diameter and 200-300μm long
d. 60-80μm in diameter and 300-400μm long
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Answer: (b).20-40μm in diameter and 100-200μm long

98. The archaebacterium Halobacterium, an extreme halophile, and Sulfolobus, a thermoacidophile, can be cultured in the presence of antibiotics such as streptomycin and chloramphenicol because
a. they contain ether-linked isoprenoids in their plasma membrane
b. they lack murein in their cell wall
c. they contain 80S, as opposed to 70S, ribosomes
d. all of the above
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Answer: (b).they lack murein in their cell wall

99. The isolation of the gonorrhoea - causing organisms, Neisseria gonorrhoeae,from a clinical specimen is facilitated by the use of media containing
a. cellulose
b. certain antibiotics
c. succinate
d. none of these
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Answer: (b).certain antibiotics

100. Anchorage -dependent cells require
a. wettable surface for growth
b. dry surface for growth
c. either (a) or (b)
d. nothing to do with the surface
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Answer: (a).wettable surface for growth