Most pathogenic bacteria are
A. obligate aerobes
B. facultative anaerobes
C. microaerophiles
D. obligate anaerobes
E. None of the above
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The growth rate of bacteria during the exponential phase of growth is
A. Zero
B. Increasing
Constant
Decreasing
E. Negative
The ability to use compounds and ions other than oxygen as terminal oxidants in respiration is a widespread microbial trait. This capacity is called
A. Photosynthesis
B. Fermentation
C. Anaerobic respiration
D. Substrate phosphorylation
E. Nitrogen fixation
Lack of the enzymes catalase and superoxide dismutase may explain why certain bacteria are
A. unable to produce oxygen radicals when exposed to O2
B. able to grow in the absence of O2
C. killed by exposure to O2
D. able to respire in the presence of O2
E. able to respire in the absence of O2
一个信号可以既是随机信号，又是确定信号，这种说法正确吗
A. 对
B. 错
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