Multiple Choice
Of the following, which occurs during the Calvin cycle?
9. Photosynthesis
Calvin Cycle
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Glyceraldehyde-3-phosphate (G3P) is produced in the stroma of chloroplasts. Which of the following statements is most accurate regarding this compound?
A
It is produced from glucose during glycolysis.
B
It is a three-carbon sugar.
C
For every three molecules of CO2 reduced in the Calvin cycle, six molecules of G3P are formed but only one of these molecules exits the cycle to be used by the plant cell.
D
For every three molecules of CO2, six molecules of G3P are formed but five molecules must be recycled to regenerate three molecules of RuBP
E
All of the listed responses are correct.
Verified step by step guidance1
Understand the role of Glyceraldehyde-3-phosphate (G3P) in photosynthesis. G3P is a product of the Calvin cycle, which occurs in the stroma of chloroplasts.
Recognize that G3P is a three-carbon sugar. This is a fundamental characteristic of G3P, making it a key intermediate in the Calvin cycle.
Analyze the process of the Calvin cycle: For every three molecules of CO2 that enter the cycle, six molecules of G3P are produced. However, only one of these G3P molecules exits the cycle to be used by the plant cell.
Understand the recycling process within the Calvin cycle: Out of the six G3P molecules produced, five are recycled to regenerate three molecules of Ribulose bisphosphate (RuBP), which is necessary for the cycle to continue.
Conclude that all the listed statements regarding G3P are correct, as they accurately describe its production, characteristics, and role in the Calvin cycle.
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