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Multiple Choice
In glycolysis, which molecule is oxidized and broken down to ultimately yield two 3-carbon molecules (pyruvate) while reducing to ?
A
Lactate
B
Glucose
C
Acetyl-CoA
D
Glycogen
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Verified step by step guidance
1
Identify the starting molecule in glycolysis that undergoes oxidation and breakdown. Glycolysis begins with a 6-carbon sugar molecule.
Recall that during glycolysis, this 6-carbon molecule is split into two 3-carbon molecules called pyruvate.
Understand that during this process, the molecule is oxidized, meaning it loses electrons, which are transferred to NAD+, reducing it to NADH.
Recognize that the molecule being oxidized and broken down to yield two pyruvate molecules is glucose.
Confirm that lactate, acetyl-CoA, and glycogen are not the direct substrates oxidized in glycolysis to produce pyruvate and NADH; rather, glucose is the correct molecule.