A Suspension of Algae Is Incubated in a Flask in the Presence

question 87

Multiple Choice

A suspension of algae is incubated in a flask in the presence of both light and CO₂. When it is transferred to the dark, the reduction of 3-phosphoglycerate to glyceraldehyde 3-phosphate is blocked, and the concentration of ribulose bisphosphate (RuBP) declines. Why does the RuBP concentration decline?

• A) Ribulose bisphosphate is synthesized from glyceraldehyde 3-phosphate.
• B) Glyceraldehyde 3-phosphate is converted to glucose.
• C) Ribulose bisphosphate is used to synthesize 3-phosphoglycerate.
• D) Both a and b
• E) Both a and c

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