Listeria is a facultative anaerobe. How does the availability of oxygen impact w

Question

Listeria is a facultative anaerobe. How does the availability of oxygen impact what happens to NADH from glycolysis?

A: If oxygen is available, NADH will be oxidized via the electron transport chain, helping to make more ATP. If no oxygen is available, NAD+ is regenerated by fermentation without making more ATP.  

B: If oxygen is available, NADH will be oxidized via the electron transport chain, helping to make more ATP. If no oxygen is available, ATP is produced by fermentation without using glycolysis or the electron transport chain.  

C: If oxygen is available, NADH will be reduced via the electron transport chain, and generates ATP when NAD+ flows through the ATP synthase pore. If no oxygen is available, NAD+ is regenerated by fermentation and makes less ATP by a different mechanism.  

D: If oxygen is available, NADH will be oxidized via the electron transport chain, helping to make a few ATP molecules. If no oxygen is available, NAD+ is regenerated by fermentation, producing even more ATP.  

Explanation / Answer

A: If oxygen is available, NADH will be oxidized via the electron transport chain, helping to make more ATP. If no oxygen is available, NAD+ is regenerated by fermentation without making more ATP.  

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