Question at position 37 Which of these processes DIRECTLY produces the greatest amount of ATP in human cells? citric acid cycleglycolysisoxidative phosphorylationformation of acetyl-CoA (pyruvate oxidation)单项选择题
A
citric acid cycle
B
glycolysis
C
oxidative phosphorylation
D
formation of acetyl-CoA (pyruvate oxidation)

Question

Question at position 37 Which of these processes DIRECTLY produces the greatest amount of ATP in human cells? citric acid cycleglycolysisoxidative phosphorylationformation of acetyl-CoA (pyruvate oxidation)单项选择题

A

citric acid cycle

B

glycolysis

C

oxidative phosphorylation

D

formation of acetyl-CoA (pyruvate oxidation)

BlackTom AI · Accepted Answer

The question asks which process DIRECTLY produces the greatest amount of ATP in human cells. 
Option 1: citric acid cycle. The TCA cycle generates some ATP equivalents (GTP in some tissues) per acetyl-CoA but most of its energy is captured as reduced cofactors (NADH, FADH2) that feed into the next stage. Thus, on the note of direct ATP production, this step is smaller. 
Option 2: glycolysis. Glycolysis yields a net gain of 2 ATP per glucose and also produces NADH, but these ATPs come from substrate-level phosphorylation early in the pathway, which is far less than what the later stages can produce through oxidative phosphorylation. 
Option 3: oxidative phosphorylation. This step uses the electron transport chain to create a proton gradient, and ATP synthase converts ADP to ATP. The majority of ATP yield from glucose (roughly 26–28 ATP per glucose in a typical human cell) comes from this stage, making it the main source of ATP. It is termed direct ATP production because the ATP synthase reaction itself generates ATP. 
Option 4: formation of acetyl-CoA (pyruvate oxidation). Pyruvate dehydrogenase converts pyruvate to acetyl-CoA while producing NADH and CO2, but no ATP is formed directly in this step. The NADH produced will later contribute to ATP production via oxidative phosphorylation, but this step itself does not generate significant ATP. 
In summary, you can think of glycolysis and the TCA cycle as providing energy carriers and a small amount of direct ATP, while oxidative phosphorylation is the dominant direct producer of ATP through ATP synthase activity driven by the proton gradient established by the electron transport chain.

Question at position 37 Which of these processes DIRECTLY produces the greatest amount of ATP in human cells? citric acid cycleglycolysisoxidative phosphorylationformation of acetyl-CoA (pyruvate oxidation)单项选择题

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