Question

The following reactions of glycolysis are irreversible except

• A. Glucose to Glucose – 6 – phosphate
• B. Glucose – 6 – phosphate to fructose – 6 – phosphate
• C. Reactions catalysed by kinases
• D. Fructose – 6 – phosphate to fructose 1,6 bisphosphate

Answer 1

The correct option is B Glucose – 6 – phosphate to fructose – 6 – phosphate

Reactions a, c and d are irreversible in glycolysis. The reaction ‘d’ catalysed by Phosphofructokinase is the rate limiting reaction of glycolysis.