First slide

The C4 Pathway

Question

How many ATP and NADPH are required for synthesis of 3 molecules of sucrose in $C_{4}$ plants?

Moderate

A

90ATP and 36 NADPH
B

180ATP and 72 NADPH
C

360 ATP and 144 NADPH
D

30 ATP and 12 NADPH

Solution

To form a hexose or to fix 6 molecules of ${CO}_{2}$ , 30 ATP and 12 NADPH are consumed in $C_{4}$ cycle.
Sucrose is a disaccharide and contains one molecule of glucose and one molecule of fructose.
Therefore, for the synthesis one sucrose molecule the ATP and NADPH consumed would be double.
So, to synthesize one molecule of sucrose there is the requirement of 30 x 2= 60ATP and 12 x 2= 24 NADPH
Therefore, for synthesis of 3 molecules of sucrose there is requirement of 60 x 3=180 ATP and 24 x 3 = 72 NADPH.

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