In C3 cycle for the fixation of every CO2 molecule, the reduction and regeneration steps require:

Question

In C3 cycle for the fixation of every CO2 molecule, the reduction and regeneration steps require: (A) 3 ATP and 2 NADPH2 (B) 2 ATP and 2 NADPH2 (C) 2 ATP and 3 NADPH2 (D) 3 ATP and 3 NADPH2

Tardigrade Admin · Accepted Answer

The Calvin cycle or C3 cycle proceeds in three stages (1) carboxylation, during which CO2 combines with ribulose -1, 5-bisphosphate; (2) reduction, during which carbohydrate is formed at the expense of the photochemically made ATP (two molecules) and NADPH (two molecules) and (3) regeneration during which the CO2 acceptor ribulose-1, 5-bisphosphate is formed again so that the cycle continues. The regeneration step requires one ATP for phosphorylation to form RuBP

Q. In $C_{3}$ cycle for the fixation of every $C O_{2}$ molecule, the reduction and regeneration steps require:

$3 A TP$ and $2 N A D P H_{2}$

$2 A TP$ and $2 N A D P H_{2}$

$2 A TP$ and $3 N A D P H_{2}$

$3 A TP$ and $3 N A D P H_{2}$

$3 A TP$ and $1 N A D P H_{2}$

Q. In C3​ cycle for the fixation of every CO2​ molecule, the reduction and regeneration steps require:

3ATP and 2NADPH2​

2ATP and 2NADPH2​

2ATP and 3NADPH2​

3ATP and 3NADPH2​