Multiple choice

In which of the following steps of glycolysis, there is neither expenditure of energy nor formation of ATP?

  1. Phosphorylation of glucose to form glucose 6-phosphate.

  2. Conversion of fructose 6-phosphate to fructose 1,6 diphosphate.

  3. Splitting of fructose 1,6 diphosphate into two molecules of triose phosphates.

  4. Conversion of 1,3-bisphosphoglycerate to 3-phosphoglycerate.

  5. Conversion of phosphoenol pyruvate to pyruvate.
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C Correct answer
Explanation

Splitting of fructose 1,6 diphosphate into two molecules of triose phosphates, an aldotriose-glyceraldehyde 3-phosphate and one ketotriose - dihydroxy acetone phosphate is catalysed by the enzyme aldolase. There is neither expenditure of energy nor formation of ATP.

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