Question

Characterize the reactions involved in these reactions of the Calvin Cycle.

A. These are reactions involved in the regeneration of RuBP. The reactions include an exergonic reaction (ATP à ADP) and the reduction of the coenzyme NADPH.
B. These reaction are involved in the reduction of CO2. Energy is required in the form of ATP, which is hydrolyzed to ADP. The substrate BPG is reduced, while the coenzyme NADPH is oxidized.
C. These reaction are involved in the fixation of CO2. Energy is required in the form of ADP, which is hydrolyzed to ATP. The substrate BPG is oxidized, while the coenzyme NADPH is reduced.
D. These reactions are part of Light Reactions in noncyclic pathway. ATP and NADPH are used during these reactions."

Answer 1

The Calvin Cycle involves three stages: fixation, reduction, and regeneration. During reduction, ATP and NADPH are used to convert 3-PGA into G3P. The Calvin Cycle ultimately regenerates RuBP.

Step-by-step explanation:

In the Calvin Cycle, there are three stages: fixation, reduction, and regeneration. In stage 1, carbon dioxide is fixed into a five-carbon molecule called RuBP. In stage 2, ATP and NADPH are used to convert 3-PGA into a three-carbon compound called G3P, which is a reduction reaction. In stage 3, the remaining G3P molecules are regenerated into RuBP using ATP, ready to react with more CO2.