Question

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? O 2 1 O 6 O 3

Answer 1

Answer:

Each of the reaction must take place three (3)times

Explanation:

The Calvin cycle occurs in the stroma of the chloroplast using the energy generated during the light dependent phase of photosynthesis.

In the stroma, Ribulose -1,5 bisphosphate carboxylase catalyses the addition of one carbon dioxide molecule to ribulose -1,5- bisphosphate to form an unstable hexose compound of 2-carboxy 3-keto 1,5 -bisphosphoribotol which breakdown to form 2 molecules of 3-phosphoglycerate. The latter is them phosphorylated by phosphoglycerate kinase using two ATP and finally glyceraldehyde 3- dehydrogenase enzyme catalyses NADPH reduction of 1,3bisphosphoglycerate to glyceraldehyde 3-phosphate. 3 molecules of carbondioxide yielded 6G3P and five is used to generate RuBP and one molecule of G3P left.