Topscore Test2 Bio #8

[Decan]

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Can someone please explain to me how oxygen is NOT necessary for ATP synthesis? It is due to the ETC that the PMF is created, which is necessary for ATP synthesis...I dont see why the answer should be B.

Thanks in advance for the help!

 

[Flipper405]

I don't have the actual question, but remember that glycolysis can produce ATP without oxygen.

 

[BenignDMD]

glycolysis

 

[IsRaEl21]

yes glycolysis doesn't require oxygen, therefore only 2 ATP is produced. U really should read the explanations in destroyer, I also had problem with it, so I suggest u to really know the destroyer in and out. Believe me best explanations.

 

[El Sol]

If oxygen is not present, there is no electron acceptor to accept the electrons at the end of the electron transport chain. If this occurs, then NADH accumulates. Once all the NAD+ has been converted to NADH, the Krebs cycle and glycolysis both stop (both need NAD+ to accept electrons). Once this happens, no new ATP is produced, and the cell soon dies.

And then there was anaerobic respiration.

Anaerobic respiration is a method cells use to escape this fate. The pathways in plants and animals, alcoholic and lactate fermentation, respectively, are slightly different, but the objective of both processes is to replenish NAD+ so that glycolysis can proceed once again (producing 2 net ATP). Anaerobic respiration occurs in the cytoplasm alongside glycolysis.

 

[Decan]

I know glycolysis is anaerobic...the question just confused me. It said "in glucose breakdown which of the follwing is true" and the answer was "oxygen is the final electron acceptor" and "oxygen is not needed for atp synthesis". I guess I was just focusing on the ETC and didnt even think about kreb's or glycolysis.