Multiple Choice
In oxidative phosphorylation, what type of molecule is ATP synthase?
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Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation
Oxidative Phosphorylation 1
Multiple Choice
In aerobic metabolism of one molecule of glucose, which process produces the most ATP (directly or via the electron transport chain and chemiosmosis) during cellular respiration?
A
Oxidative phosphorylation (electron transport chain coupled to ATP synthase)
B
Fermentation (lactate or ethanol production)
C
Glycolysis (substrate-level phosphorylation)
D
Citric acid cycle (Krebs cycle) substrate-level phosphorylation
Verified step by step guidance1
Step 1: Understand the overall process of aerobic metabolism of glucose, which includes glycolysis, the citric acid cycle (Krebs cycle), and oxidative phosphorylation (electron transport chain coupled to ATP synthase).
Step 2: Identify the ATP yield from glycolysis, which produces a small amount of ATP directly through substrate-level phosphorylation.
Step 3: Recognize that the citric acid cycle also produces a limited amount of ATP directly via substrate-level phosphorylation, along with high-energy electron carriers (NADH and FADH2).
Step 4: Understand that oxidative phosphorylation uses the electrons from NADH and FADH2 to drive the electron transport chain, creating a proton gradient that powers ATP synthase to produce a large amount of ATP.
Step 5: Conclude that oxidative phosphorylation produces the most ATP during aerobic metabolism of one glucose molecule, far exceeding the ATP produced directly by glycolysis or the citric acid cycle.
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