When a Suspension of Algae Is Incubated in a Flask

question 143

Multiple Choice

When a suspension of algae is incubated in a flask in the presence of light and CO₂ and then transferred to the dark, the reduction of 3-phosphoglycerate to glyceraldehyde 3-phosphate is blocked. This reaction stops when the algae are placed in the dark because

• A) the reaction requires CO₂.
• B) the reaction is exergonic.
• C) the reaction requires ATP and NADPH + H⁺.
• D) the reaction requires O₂.
• E) chlorophyll is not synthesized in the dark.

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