The compound 2-carboxyarabinitol 1-phosphate is present in plants only at night and is a strong activator of rubisco.

Name: The compound 2-carboxyarabinitol 1-phosphate is present in plants only at night and is a strong activator of rubisco.
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Quizplus · Accepted Answer

2-Carboxyarabinitol 1-phosphate is actually a strong inhibitor of rubisco, not an activator, and it regulates the enzyme's activity by binding to it at night when photosynthesis is not taking place.

The Compound 2-Carboxyarabinitol 1-Phosphate Is Present in Plants Only at Night