Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: ATP is used at two steps in glycolysis. Reason R: First ATP is used in converting glucose into glucose-6-phosphate and second ATP is used in conversion of fructose-6-phosphate into fructose-1,6-diphosphate. In the light of the above statements, choose the correct answer from the options given below:
Answer: (A) Both A and R are true and R is the correct explanation of A. Answer: (A) Both A and R are true and R is the correct explanation of A.
- A.Both A and R are true and R is the correct explanation of A✓
- B.Both A and R are true but R is NOT the correct explanation of A
- C.A is true but R is false
- D.A is false but R is true
Correct Answer
(A) Both A and R are true and R is the correct explanation of A
Solution & Explanation
Answer: (A) Both A and R are true and R is the correct explanation of A. Solution: Assertion is true: ATP is utilised (invested) at two steps of glycolysis. The Reason correctly identifies those exact steps: the first ATP converts glucose to glucose-6-phosphate (hexokinase) and the second converts fructose-6-phosphate to fructose-1,6-bisphosphate (phosphofructokinase). Since the Reason states precisely the two ATP-investment steps, it correctly explains the Assertion. NCERT: Ch 12, p.156, line ~20: "ATP is utilised at two steps: first in the conversion of glucose into glucose 6-phosphate and second in the conversion of fructose 6-phosphate to fructose 1, 6-bisphosphate".