Multiple Choice
In cellular respiration, which stage produces the most ATP in aerobic eukaryotic cells?
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Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation
Oxidative Phosphorylation 1
Multiple Choice
In cellular energy metabolism under aerobic conditions, which energy system produces the greatest amount of ATP per molecule of glucose?
A
Oxidative phosphorylation via the electron transport chain and chemiosmosis
B
ATP generation by substrate-level phosphorylation alone (e.g., in glycolysis and the TCA cycle)
C
Fermentation (lactic acid or alcoholic)
D
Glycolysis
Verified step by step guidance1
Step 1: Understand the different energy systems involved in cellular metabolism under aerobic conditions. These include glycolysis, the TCA (Krebs) cycle, substrate-level phosphorylation, and oxidative phosphorylation via the electron transport chain and chemiosmosis.
Step 2: Recall that glycolysis and the TCA cycle generate ATP primarily through substrate-level phosphorylation, which produces a relatively small amount of ATP directly per glucose molecule.
Step 3: Recognize that fermentation pathways (lactic acid or alcoholic) occur under anaerobic conditions and yield much less ATP per glucose molecule compared to aerobic pathways.
Step 4: Focus on oxidative phosphorylation, which occurs in the mitochondria and involves the electron transport chain and chemiosmosis. This process uses electrons from NADH and FADH2 to drive ATP synthesis and produces the largest amount of ATP per glucose molecule.
Step 5: Compare the ATP yields from each system: glycolysis and substrate-level phosphorylation produce a few ATP molecules, fermentation produces even less, while oxidative phosphorylation produces the greatest amount of ATP per glucose molecule under aerobic conditions.
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