How many G3P molecules are needed to form one glucose molecule?

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Study for the Principles of Biology Exam 2. Enhance your understanding with multiple-choice questions, detailed explanations, and study tips. Ace your biology test!

Multiple Choice

How many G3P molecules are needed to form one glucose molecule?

Explanation:
G3P is a 3-carbon molecule, while glucose has 6 carbons. To build a hexose, you need two three-carbon units, so two G3P molecules can join to form one glucose (after a couple of rearrangements and dephosphorylation). In the Calvin cycle, the other G3P produced is recycled to regenerate the starting RuBP, keeping the cycle going. So the amount required to form one glucose is two.

G3P is a 3-carbon molecule, while glucose has 6 carbons. To build a hexose, you need two three-carbon units, so two G3P molecules can join to form one glucose (after a couple of rearrangements and dephosphorylation). In the Calvin cycle, the other G3P produced is recycled to regenerate the starting RuBP, keeping the cycle going. So the amount required to form one glucose is two.

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