Question

multiple choice question

what is the first reaction in glycolysis to result in the formation of 3-carbon molecules?

1
4
2
3
5

Explanation:

Identify the reactions of glycolysis

The pathway of glycolysis consists of 10 sequential enzymatic reactions:

1. Glucose to Glucose-6-phosphate (6-carbon)
2. Glucose-6-phosphate to Fructose-6-phosphate (6-carbon)
3. Fructose-6-phosphate to Fructose-1,6-bisphosphate (6-carbon)
4. Fructose-1,6-bisphosphate to Dihydroxyacetone phosphate and Glyceraldehyde-3-phosphate (two 3-carbon molecules)

Determine the first reaction producing 3-carbon molecules

Reaction 4, catalyzed by the enzyme aldolase, cleaves the 6-carbon sugar fructose-1,6-bisphosphate into two distinct 3-carbon triose phosphates. Thus, reaction 4 is the first reaction in glycolysis to result in the formation of 3-carbon molecules.

Answer:

• 1
• 4 (Correct answer)
• 2
• 3
• 5