Question

At the expense of two ATP molecules, how many phosphate groups are present on the fructose in the third step of glycolysis?

(a) 2

(b) 3

(c) 4

(d) 5

This question was addressed to me in examination.

Question is from Aerobic Respiration topic in division Nucleus & Aerobic Respiration of Cell Biology

Answer 1

Correct choice is (a) 2

To explain I would say: Glucose is first phosphorylated at the expense of one ATP molecule, rearranging to form fructose phosphate and then phosphorylation takes place again leading to a total of two phosphate groups attached to the fructose chain.