NURSING EXAM QUESTIONS
MICROBIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following statements are TRUE?
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Nitrogen-fixing bacteria, such as cyanobacteria, can use atmospheric nitrogen (N2) for their nitrogen source.
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Agar is a polysaccharide derived from plant alga and is used as a solidifying agent in microbiological media since few bacteria can degrade it.
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Aerotolerant anaerobes grow more efficiently anerobically than they do aerobically.
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Facultative anaerobes grow more efficiently aerobically than anaerobically.
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Explanation:
Detailed explanation-1: -Therefore, the correct answer is (a) They can survive in the presence or absence of oxygen.
Detailed explanation-2: -Facultative anaerobes (like Escherichia coli) are able to adapt their metabolism and can grow under conditions with or without oxygen but prefer aerobic conditions.
Detailed explanation-3: -3: Facultative anaerobes can grow with or without oxygen because they can metabolise energy aerobically or anaerobically. They gather mostly at the top because aerobic respiration generates more ATP than fermentation. 4: Microaerophiles need oxygen because they cannot ferment or respire anaerobically.
There is 1 question to complete.