Question

level 2
q2
what is the gain of atp at the end of
the electron transport chain?
a. 1 atp
b. 38 atp
c. 35 atp
d. 2 atp

Explanation:

The Electron Transport Chain (ETC) is part of cellular respiration. In aerobic respiration, the total ATP gain including glycolysis, Krebs cycle, and ETC is around 36 - 38, but the ETC itself (along with oxidative phosphorylation) produces a large portion. Wait, actually, the ETC and chemiosmosis produce about 32 - 34 ATP, but the question might have a simplified view. Wait, no, maybe the options are considering the total from all stages? Wait, no, the question is about the gain at the end of ETC. Wait, maybe the options have a typo or a simplified approach. Wait, actually, the correct total ATP from aerobic respiration (including ETC) is around 36 - 38, but if the question is about ETC alone, but the options: A is too low, D is glycolysis net, B is total (maybe old textbook value), C is wrong. Wait, maybe the question is misphrased, but among the options, the total ATP from all stages (including ETC) is often cited as 38 in some textbooks (old model), so B. 38 ATP.

Answer:

B. 38 ATP