Question

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:

• A. Both A and R are true but R is NOT the correct explanation of A.
• B. A is true but R is false.
• C. A is false but R is true.
• D. Both A and R are true and R is the correct explanation of A.

Answer 1

The Correct Option is D

Assertion A is true because ATP is indeed used at two steps in glycolysis. These steps are the conversion of glucose to glucose-6-phosphate, and the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate. In both of these steps, a phosphate group is added to the substrate, and ATP is used to provide the phosphate group.
Reason R is also true and provides the correct explanation for Assertion A. The first ATP is used in the conversion of glucose to glucose-6-phosphate, and the second ATP is used in the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate. Therefore, Reason R correctly explains why ATP is used at two steps in glycolysis.

Therefore, The correct answer is (D): Both A and R are true and R is the correct explanation of A.

Answer 2

The assertion A is true because ATP (adenosine triphosphate) requires two major steps in glycolysis. These steps are:

1. Conversion of glucose to glucose-6-phosphate

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

In both these steps, a phosphate group is added to the substrate, and ATP is used to provide the phosphate group

The reason R is true and provides the correct explanation of A. In glycolysis, the first step is the conversion of glucose to glucose-6-phosphate catalyzed by the reaction hexokinase. The second step involves the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate catalyzed by phosphofructokinase.