ETC Question

[TailorMade]

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Here's the question:

Which of the following is true concerning the electron transport system?

A. Oxygen is a necessary participant
B. Most of ATP generated in cellular oxidation is produced by the electron transport system
C. The electrons carried by each molecule of FADH2 yield the same number of ATP molecules as NADH
D. Two of the above are true
E. All of the above are true

The answer is D as both A and B are correct.

Is A actually correct? I didn't think so because of anaerobic bacteria that don't use oxygen as the final electron acceptor.

Thanks for the help

 

[TheDentist16]

Generally speaking, oxygen is usually the final electron acceptor. Yes, there are exceptions to that generalization, but in this case it's not asking for specifically anaerobic bacteria. It's a more all-inclusive type of question. For the Bio section you should go with the more general understanding of the concept, unless the question specifies otherwise.

 

[TailorMade]

Good to know. I'll try and think more generally, haha. Thanks!

 

[jaymin8]

Anaerobic respiration only undergoes glycolysis whereas aerobic respiration undergoes glycolysis, Kreb Cycle, and the ETC. In the ETC, the oxygen (which comes from the water molecule), is the final electron acceptor. Also, without oxygen, you don't make it to the ETC because it is anaerobic respiration (which only goes glycolysis). Hope this makes sense haha.