Multiple Choice
In glycolysis, ATP molecules are produced directly by which process?
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Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway
Glycolysis 2
Multiple Choice
In glycolysis, ATP is produced primarily by which mechanism?
A
Photophosphorylation, driven by light-dependent reactions in chloroplast thylakoid membranes
B
Substrate-level phosphorylation, where a phosphate group is transferred directly from a high-energy intermediate to ADP
C
Direct phosphorylation of ADP by molecular oxygen during glucose oxidation
D
Oxidative phosphorylation, driven by the electron transport chain and a proton gradient across the inner mitochondrial membrane
Verified step by step guidance1
Understand the context of ATP production in glycolysis: Glycolysis is a metabolic pathway that breaks down glucose into pyruvate, producing ATP in the process.
Recall the different mechanisms of ATP synthesis: Photophosphorylation (in chloroplasts), substrate-level phosphorylation, and oxidative phosphorylation (in mitochondria).
Identify that glycolysis occurs in the cytoplasm and does not involve light or electron transport chains, so photophosphorylation and oxidative phosphorylation are not the primary mechanisms here.
Focus on substrate-level phosphorylation, which involves the direct transfer of a phosphate group from a high-energy intermediate molecule to ADP, forming ATP.
Conclude that in glycolysis, ATP is produced primarily by substrate-level phosphorylation, where enzymes catalyze the transfer of phosphate groups directly to ADP without the involvement of a proton gradient or oxygen.
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