Multiple Choice
Which statement best describes the roles of glycolysis and the phosphagen system during aerobic and anaerobic exercise?
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8. Respiration
Glycolysis
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Which of the following molecules is produced during the second half (last 5 steps) of glycolysis?
A
Glucose-6-phosphate
B
Citrate
C
Pyruvate
D
Oxaloacetate
Verified step by step guidance1
Understand that glycolysis is a metabolic pathway that breaks down glucose into two molecules of pyruvate, producing ATP and NADH in the process.
Recall that glycolysis consists of 10 steps, divided into two phases: the energy investment phase (first 5 steps) and the energy payoff phase (last 5 steps).
Focus on the energy payoff phase, where intermediates such as 1,3-bisphosphoglycerate, 3-phosphoglycerate, 2-phosphoglycerate, phosphoenolpyruvate (PEP), and finally pyruvate are produced.
Eliminate the incorrect options: Glucose-6-phosphate is part of the energy investment phase, citrate is part of the citric acid cycle, and oxaloacetate is also part of the citric acid cycle, not glycolysis.
Conclude that the molecule produced during the second half of glycolysis is pyruvate, which is the final product of the pathway.
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