The diagram below shows the Calvin cycle, which is a series of enzymatic reactions that manufacture sugars.
How many times must this cycle "turn" to make one molecule of glucose (six carbons)?

Question

The diagram below shows the Calvin cycle, which is a series of enzymatic reactions that manufacture sugars. 
How many times must this cycle "turn" to make one molecule of glucose (six carbons)?

Quizplus · Accepted Answer

The Calvin cycle involves fixing CO2 to form a 3-carbon molecule (3-phosphoglycerate) which goes through a series of enzymatic reactions to form a 6-carbon sugar molecule (glucose), this cycle must turn 6 times to assemble enough 6-carbon sugar molecules (glucose) from 3-carbon precursors. Therefore, the answer is C) 6.

The Diagram Below Shows the Calvin Cycle, Which Is a Series