Question

During the reduction phase of the Calvin cycle, phosphoglyceric acid is reduced to______utilizing________as the reduction source.
A.phosphoglyceraldehyde; NADPH+H+
B. phosphoglyceraldehyde; NADH+H+
C. ribulose 1,5 - bisphosphate; NADH+H+
D. pyruvic acid; NADPH+H+

Answer 1

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During the reduction phase of the Calvin cycle, phosphoglyceric acid is reduced to
$\textbf{phosphoglyceraldehyd}$ utilizing $\textbf{NADPH+H+}$ as the reduction source.

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Answer 2

During the reduction phase of the Calvin cycle, phosphoglyceric acid is reduced to phosphoglyceraldehyde utilizing NADPH+H+ as the reduction source.

• The Calvin cycle or C₃ Pathway is involved in the carbon fixation that converts carbon dioxide into glucose by utilizing products of light reaction, therefore, also called Dark Reaction.
• The Cycle is divided into 3 phases:

1. Carbon Fixation
2. Reduction
3. Regeneration

• Carbon fixation involves the entry of a molecule of carbon dioxide that is combined with Ribulose-1,5-BisPhosphate(RuBP) in presence of the RuBiCO enzyme to form 2 molecules of 3- Phosphoglycerate(3-PGA).
• The Reduction Phase involves the reduction of 2 molecules of 3-PGA to 2 molecules of 3-Phosphoglycerate by utilizing 1 molecule of ATP and NADPH.
• In Regeneration Phase, RuBP is again regenerated by utilization of ATP and release of sugar(glucose).
• 6 molecules of carbon dioxide are fixed by 6 cycles to produce 1 molecule of glucose.