Question

How many ATP and NADPH molecules are respectively required to make one molecule of glucose through the Calvin cycle?

• A. 3 and 2
• B. 9 and 6
• C. 18 and 12
• D. 12 and 18

Answer 1

Answer: (C)

18 and 12

For every $C{O}_2$ molecule entering the Calvin cycle, $3$ molecules of $ATP$ and $2$ molecules of NADPH are required. To make one molecule of glucose, $6$ turns of the cycles are required

$(6\times 3ATP=18ATP$ and $6\times 2NADPH=12NADPH)$.

In	Out
$6$ $C{O}_2$	$1glucose$
$18ATP$	$18ADP$
$12NADPH$	$12NADP$ So, the correct answer is '

18 and 12'.