Multiple Choice
During glycolysis, one molecule of glucose is broken down into which of the following products?
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Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway
Glycolysis 1
Multiple Choice
Which set of molecules represents the net products formed from one molecule of glucose during glycolysis under aerobic conditions?
A
2 pyruvate, 2 ATP (net), 2 NADH, and 2 H2O
B
2 acetyl-CoA, 2 ATP (net), 2 NADH, and 2 CO2
C
2 pyruvate, 4 ATP (net), and 2 NADH
D
2 lactate, 2 ATP (net), and 2 NAD+
Verified step by step guidance1
Step 1: Understand the process of glycolysis. Glycolysis is the metabolic pathway that converts one molecule of glucose (a 6-carbon sugar) into two molecules of pyruvate (each with 3 carbons), producing energy in the form of ATP and reducing equivalents in the form of NADH.
Step 2: Recall the net ATP yield from glycolysis. Although 4 ATP molecules are produced during glycolysis, 2 ATP molecules are consumed in the early steps, resulting in a net gain of 2 ATP molecules per glucose molecule.
Step 3: Identify the electron carriers produced. Glycolysis produces 2 molecules of NADH by reducing NAD+ as glucose is oxidized to pyruvate.
Step 4: Consider the fate of pyruvate under aerobic conditions. Under aerobic conditions, pyruvate is transported into mitochondria for further oxidation, but glycolysis itself ends with pyruvate as the product, not acetyl-CoA or lactate.
Step 5: Recognize the additional products formed during glycolysis. Water (H2O) molecules are produced as byproducts during the enzymatic steps of glycolysis.
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