The product of the third step of glycolysis is
Correct answer: D. Fructose 1, 6-biphosphate
- A. Glucose
- B. Fructose 6-phosphate
- C. Glucose 6-phosphate
- D. Fructose 1, 6-biphosphate
Explanation
In the glycolytic pathway, the third step involves the phosphorylation of fructose 6-phosphate to form fructose 1,6-bisphosphate. This reaction is catalyzed by the enzyme phosphofructokinase-1 (PFK-1) and is a key regulatory step, often considered the rate-limiting step of glycolysis. The correct answer is fructose 1,6-bisphosphate. The other options are incorrect, as they represent different stages or molecules involved in the glycolytic process: Glucose is the initial substrate, glucose 6-phosphate is the product of the first phosphorylation step, and fructose 6-phosphate is the product of the second step.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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