Escherichia coli is a facultative anaerobic bacterium because it can
Correct answer: C. survive without oxygen, but uses oxygen if it is present.
- A. not survive in the presence of oxygen.
- B. utilise low concentration of oxygen only.
- C. survive without oxygen, but uses oxygen if it is present.
- D. neither use oxygen for its growth nor can be harmed by it.
Explanation
A facultative anaerobe, such as Escherichia coli, can grow in both aerobic (with oxygen) and anaerobic (without oxygen) environments. However, it thrives better when oxygen is available because it can generate more energy through aerobic respiration than anaerobic processes. Therefore, it does not require oxygen but will use it if present, which makes Option C correct. Option A is incorrect because Escherichia coli can indeed survive in oxygen. Option B is incorrect as facultative anaerobes are not limited to low concentrations of oxygen. Option D describes aerotolerant organisms, which makes it incorrect for this question.
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Kingdom Prokaryotae includes bacteria and cyanobacteria, organisms with no membrane-bound nucleus or membrane-bound organelles. It covers their cell wall, capsule, flagella, plasmids, forms of nutrition, binary fission, useful and harmful roles, and the differences between prokaryotic cells and eukaryotic cells.
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