Multiple Choice
In aerobic cellular respiration, pyruvate molecules must be transformed through a process called pyruvate oxidation before they can be broken down in the Krebs Cycle. What are the products of pyruvate oxidation?
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8. Respiration
Pyruvate Oxidation
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Each of the following describes the pyruvate oxidation reaction except that _____________________.
A
It connects glycolysis to the citric acid cycle.
B
Each pyruvate is converted to an acetyl-CoA molecule.
C
NAD+ is reduced to NADH.
D
This reaction occurs within the cytoplasm.
E
Carbon dioxide is released as a by-product.
Verified step by step guidance1
Understand the context of pyruvate oxidation: Pyruvate oxidation is a crucial step in cellular respiration that links glycolysis to the citric acid cycle.
Identify the location of pyruvate oxidation: Pyruvate oxidation occurs in the mitochondria, specifically in the mitochondrial matrix, not in the cytoplasm.
Recognize the conversion process: During pyruvate oxidation, each pyruvate molecule is converted into an acetyl-CoA molecule, which is then used in the citric acid cycle.
Consider the role of electron carriers: NAD+ is reduced to NADH during pyruvate oxidation, which is important for the electron transport chain.
Note the release of by-products: Carbon dioxide is released as a by-product during pyruvate oxidation, which is a key step in the decarboxylation process.
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