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?
12
views
Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation
Oxidative Phosphorylation 1
Multiple Choice
In aerobic metabolism of one molecule of glucose in a eukaryotic cell, which energy pathway produces the most ATP?
A
Oxidative phosphorylation via the electron transport chain and ATP synthase
B
Citric acid (TCA) cycle substrate-level phosphorylation
C
Glycolysis
D
Fermentation (lactate or ethanol production)
Verified step by step guidance1
Identify the main energy-producing pathways involved in aerobic metabolism of glucose: glycolysis, the citric acid (TCA) cycle, and oxidative phosphorylation via the electron transport chain and ATP synthase.
Recall that glycolysis produces a small amount of ATP directly through substrate-level phosphorylation, generating 2 ATP molecules per glucose molecule.
Understand that the citric acid cycle also produces a small amount of ATP (or GTP) directly through substrate-level phosphorylation, but its main role is to generate high-energy electron carriers (NADH and FADH2).
Recognize that oxidative phosphorylation uses the NADH and FADH2 produced in glycolysis and the TCA cycle to drive the electron transport chain, creating a proton gradient that powers ATP synthase to produce a large amount of ATP.
Conclude that among these pathways, oxidative phosphorylation produces the most ATP per glucose molecule because it efficiently converts the energy stored in electron carriers into ATP.
Related Videos
Related Practice
