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The balance sheet for ATP production in glycolysis has been given below. Select the option which correctly fills up the blanks for P,Q,R and S ['X' stands for ‘nil’].

Sl.NoStepsATP utilizationATP production
1.GlucoseGlucose6phosphatePX
2.Fructose6phosphateFructose1,6bisphosphate1Q
3..1,3bisphosphoglyceric3Phosphoglyceric acidXR
42PhosphoenolpyruvicacidPyruvic AcidS2


(A) P1;QX;RX;S2
(B) P1;QX;R2;SX
(C) P2;Q1;RX;S1
(D) P1;Q1;R2;SX

Answer
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Hint: Glycolysis is the first process in the respiration in which the complex food molecules like glucose are converted into the pyruvate. This pyruvate then moves to the process of citric acid cycle or Krebs’s cycle for the further functions. In the conversion process of glucose, various ATPs are involved in the utilization and also released.

Complete Answer:
From the given table,
(1) In the process of conversion of glucose into the Glucose6phosphate , one ATP molecule is utilized for the conversion. At the end of the conversion no ATP molecules are released. Similarly, in the process of the transformation of Fructose6phosphate to the Fructose1,6bisphosphate, One ATP molecule is used and no ATP molecule is liberated. Hence the value of P is 1 and the value of Q is X.
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(2) In the process of conversion of 1,3bisphosphoglyceric to the 3Phosphoglyceric acid and in 2Phosphoenolpyruvicacid toPyruvic Acid, two ATP molecules are used and no such ATP molecules are liberated. Hence the value of R is 2 and the value of S is X.

Thus, the option (D) is correct.

Note: Glycolysis is also known as EMP pathway. At the end of the process ATP and NADH molecules are produced. Hence totally two ATPs are produced from the EMP pathway which is used in the breakdown of further process in the cellular respiration.
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