The reactions of the Calvin cycle used to be referred to as the "dark reactions" of photosynthesis, implying that light was not required for this pathway to incorporate CO2 into carbohydrate

However, in the absence of light the Calvin cycle shuts down. Which of the
following parts of the Calvin cycle would be impacted FIRST by the absence of light energy?
A. the reduction of 3-phosphoglycerate and
the regeneration of RuBP
B. the carboxylation of RuBP and the
reduction of 3-phosphoglycerate
C. the carboxylation of RuBP and the
regeneration of RuBP
D. the carboxylation of RuBP and the
synthesis of hexose sugars


A

Biology & Microbiology

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