Question

How many molecules of ATP and NADP are required in formation of two molecules of glucose? How many Calvin cycles are required?

• A. 36 ATP, 24 NADPH, 12 Calvin cycles
• B. 36 ATP, 24 NADPH, 6 Calvin cycles
• C. 18 ATP, 12 NADPH, 6 Calvin cycles
• D. 24 ATP, 38 NADPH, 12 Calvin cycles

Answer 1

The correct option is A 36 ATP, 24 NADPH, 12 Calvin cycles

The net reaction of Calvin cycle or C${}_3$ cycle is :

$6RUBP+6C{O}_2+18ATP+12NADPH\to 6RUBP+C_6{H}_{12}{O}_6+18ADP+12{NADP}^{+}+18Pi$

6 calvin cycles, 18 ATP and 12 NADPH required to form 1 glucose molecule.

So, to form two molecules of glucose, 12 Calvin cycle, 36 ATP and 24 NADPH required.

Hence, the correct answer is '36 ATP, 24 NADPH, 12 Calvin cycle'.