The product of the Calvin cycle is a triose-phosphate sugar that is either exported from the chloroplast or used to regenerate RUBP. How many times must each of the reactions in the Calvin cycle take place in order to complete the synthesis of one 3-carbon triose phosphate sugar molecule?
A)6
B)3
C)2
D)1

Question

Quizplus · Accepted Answer

Each triose-phosphate molecule requires three CO2 molecules to be fixed by three RuBP (which is then regenerated) through the Calvin cycle. Therefore, each of the reactions in the Calvin cycle must occur three times to produce one triose-phosphate sugar molecule.

The Product of the Calvin Cycle Is a Triose-Phosphate Sugar