46. Bacteria of genus Nitrosomonas use __________ as their electron source.
A. ammonia
B. H2S
C. succinate
D. light
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
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
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
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