How many molecules of ATP and NADPH are required for every molecule of CO2 fixed in the Calvin cycle

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Question

How many molecules of ATP and NADPH are required for every molecule of CO2 fixed in the Calvin cycle?
(1) 2 molecules of ATP and 3 molecules of NADPH
(2) 2 molecules of ATP and 2 molecules of NADPH
(3) 3 molecules of ATP and 3 molecules of NADPH
(4) 3 molecules of ATP and 2 molecules of NADPH

Accepted Answer

Correct Answer: D — 3 molecules of ATP and 2 molecules of NADPHStep-by-step Solution:In the Calvin cycle, for every molecule of CO2 fixed (i.e., to produce one molecule of G3P that can be used to form glucose), the following are consumed:1 CO2 is combined with RuBP to form two molecules of 3-PGA.Each 3-PGA is reduced to G3P using 1 ATP and 1 NADPH per 3-PGA. So for two 3-PGA, 2 ATP and 2 NADPH.Additionally, to regenerate RuBP, 1 more ATP is used per CO2 fixed.Total per CO2: 3 ATP and 2 NADPH. For one glucose (6 CO2), 18 ATP and 12 NADPH are required. Thus, the correct answer is 3 ATP and 2 NADPH.Key Concepts: Calvin cycle (C3 pathway), energy and reducing power requirements: 3 ATP and 2 NADPH per CO2, RuBP regeneration, carbon fixation.

How many molecules of ATP and NADPH are required for every molecule of CO2 fixed in the Calvin cycle? (1) 2 molecules of ATP and 3 molecules of NADPH (2) 2 molecules of ATP and 2 molecules of NADPH (3) 3 molecules of ATP and 3 molecules of NADPH (4) 3 molecules of ATP and 2 molecules of NADPH

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How many molecules of ATP and NADPH are required for every molecule of CO2 fixed in the Calvin cycle? (1) 2 molecules of ATP and 3 molecules of NADPH (2) 2 molecules of ATP and 2 molecules of NADPH (3) 3 molecules of ATP and 3 molecules of NADPH (4) 3 molecules of ATP and 2 molecules of NADPH

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