Biochemistry : Calvin Cycle Carbohydrate Intermediates

Study concepts, example questions & explanations for Biochemistry

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Example Questions

Example Question #1 : Calvin Cycle Carbohydrate Intermediates

What happens during stage 1 of the Calvin cycle?

Possible Answers:

Fructose-6-phosphate becomes ribulose 5-phosphate

2 ATP molecules react with 3-phosphoglycerate to form 1,3-bisphosphoglycerate

ATP reacts with ribulose 5-phosphate to become ribulose 1,5-bisphosphate

Carbon dioxide and ribulose 1,5-bisphosphate react to form 3-phosphoglycerate

NADPH and 1,3 bisphosphoglycerate react to form glyceraldehyde-3-phosphate

Correct answer:

Carbon dioxide and ribulose 1,5-bisphosphate react to form 3-phosphoglycerate

Explanation:

All of the answer choices are steps in the Calvin cycle, but the only one that describes the first stage - fixation - is  and ribulose 1,5-bisphosphate reacting to form 3-phosphoglycerate.

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