Question

when is most of the atp in cellular respiration produced?
in the citric acid cycle
during the last steps, when the
electron transport chain
generates a proton gradient for
atp synthase to use
during pyruvate oxidation
it is produced in equal amounts at
all stages of cellular respiration
during glycolysis
i dont know yet

Explanation:

Key Concepts:

• Glycolysis: Produces a small amount of ATP (net gain of 2 ATP per glucose molecule).
• Pyruvate oxidation: Does not directly produce a large amount of ATP; it mainly prepares acetyl - CoA for the citric acid cycle.
• Citric acid cycle: Produces a moderate amount of ATP (via substrate - level phosphorylation, around 2 ATP per glucose molecule).
• Electron transport chain (ETC): The ETC generates a proton gradient. ATP synthase uses this proton gradient (chemiosmosis) to produce a large amount of ATP. In aerobic respiration, most of the ATP (about 26 - 28 ATP per glucose molecule in eukaryotes) is produced during the steps related to the electron transport chain and chemiosmosis.

Answer:

During the last steps, when the electron transport chain generates a proton gradient for ATP synthase to use.