The product(s) of the fourth step of glycolysis:
Correct answer: D. G3P/PGAL and Dihydroxyacetone phosphate
- A. G3P
- B. 3PGAL
- C. Dihydroxyacetone phosphate
- D. G3P/PGAL and Dihydroxyacetone phosphate
Explanation
The fourth step of glycolysis is catalyzed by the enzyme aldolase, which cleaves fructose 1,6-bisphosphate into two three-carbon molecules: glyceraldehyde 3-phosphate (G3P) and dihydroxyacetone phosphate (DHAP). Both of these molecules are triose phosphates. While G3P is directly used in subsequent steps of glycolysis, DHAP can be readily converted into G3P by the enzyme triose phosphate isomerase, allowing it to continue down the glycolytic pathway. Thus, the products of the fourth step are both G3P and DHAP. Options A, B, and C are incorrect because they each represent only part of the total set of products formed at this 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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