Growth and Nutrition of Bacteria – Section 1

46. Bacteria of genus Nitrosomonas use __________ as their electron source.

A. ammonia
B. H2S
C. succinate
D. light

Correct Answer: A. ammonia

47. All organisms require at least small amounts of carbon dioxide, However, some can use CO2 as their sole source of carbon. Such organisms are termed as

A. autotrophs
B. phototrophs
C. chemotrophs
D. photo-organotrophs

Correct Answer: A. autotrophs

48. The generation time of a culture that produces two generations per hour is

A. greater than that produces three generations per hour
B. lesser than that produces three generations per hour
C. equal to that produces three generations per hour
D. none of the above

Correct Answer: A. greater than that produces three generations per hour

49. Autotrophic bacteria are those which

A. make their own food
B. form a long chain glycocalyx
C. are highly susceptible to penicillin
D. produce a blue-green pigment

Correct Answer: A. make their own food

50. Which of the following organisms typically get their carbon for biosynthesis from organic compounds?

A. Aerobic, glucose-respiring bacteria (aerobic respiration)
B. Ammonia-oxidizing bacteria (chemolithotrophic bacteria)
C. Photosynthetic cyanobacteria (phototrophic metabolism)
D. None of the above

Correct Answer: A. Aerobic, glucose-respiring bacteria (aerobic respiration)

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