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NEET 2026
Exam
NEET
Year
2026
Subject
Biology
Chapter
Chapter

NEET 2026 · Biology · Chapter

To fix 5 molecules of CO_2 during the Calvin cycle, what is the...

To fix 5 molecules of CO2CO_2 during the Calvin cycle, what is the total number of ATP and NADPH molecules consumed respectively?

Options

  1. A10 ATP and 15 NADPH
  2. B15 ATP and 10 NADPH
  3. C15 ATP and 15 NADPH
  4. D20 ATP and 10 NADPH

Correct answer

B. 15 ATP and 10 NADPH

Step-by-step solution

In the Calvin cycle, the fixation of one molecule of CO2CO_2 requires 33 molecules of ATP and 22 molecules of NADPH.

For the fixation of 55 molecules of CO2CO_2, the total number of ATP molecules consumed is 5×3=155 \times 3 = 15 ATP.

The total number of NADPH molecules consumed is 5×2=105 \times 2 = 10 NADPH.

Thus, 1515 ATP and 1010 NADPH molecules are consumed.

Answer: 15 ATP and 10 NADPH
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