Question

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'].

	Steps	ATP Utilisation	ATP Production
1.	$Glucose\to Glucose-6-phosphate$	P	X
2.	$Fructose-6-phosphate\to Fructose-1,6-bisphosphate$	1	Q
3.	$1,3-bisphosphoglycericacid\to 3-Phospho-glycericacid$	X	R
4.	$2-Phosphoenolpyruvicacid\to Pyruvicacid$	S	2

• A. P-1; Q-X; R-X; S-2
• B. P-1; Q-X; R-2; S-X
• C. P-2; Q-1; R-X; S-1
• D. P-X; Q-1; R-2; S-X

Answer 1

The correct option is B P-1; Q-X; R-2; S-X

During glycolysis, the conversion of glucose into glucose-6-phosphate requires the utilization of one ATP molecule and no ATP molecules are produced. Similarly, there is no production of ATP molecules during the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate and only one ATP molecule is utilized. Also, during the conversion of 1,3−bisphosphoglycericacid to 3−Phospho−glycericacid and that of 2−Phosphoenolpyruvicacid to pyruvic acid, tow molecules each of ATP as utilized and no ATP is produced.

So, the correct answer is 'P-1; Q-X; R-2; S-X'.