NEET 2023, Biology Q20: Dark Reactions and Photorespiration

NEET2023Biology

How many ATP and NADPH $_{2}$ are required for the synthesis of one molecule of Glucose during Calvin cycle?

A
$12$ ATP and $12$ NADPH $_{2}$
B
$18$ ATP and $12$ NADPH $_{2}$
C
$12$ ATP and $16$ NADPH $_{2}$
D
$18$ ATP and $16$ NADPH $_{2}$

Solution

Per CO $_{2}$ fixed, the Calvin cycle uses $3$ ATP and $2$ NADPH. Making one glucose requires fixing $6$ CO $_{2}$ molecules, so the total cost is $6 \times 3 = 18$ ATP and $6 \times 2 = 12$ NADPH.

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NEET 2023, Biology Q20: Dark Reactions and Photorespiration

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