Question
Which of the following statements about RuBisCO is true?
It is an enzyme involved in the photolysis of water.
It catalyzes the carboxylation of RuBP.
It is active only in the dark.
It has higher affinity for oxygen than carbon dioxide.
RuBisCO (Ribulose bisphosphate carboxylase-oxygenase) catalyses the most crucial step of the Calvin cycle: the carboxylation of Ribulose bisphosphate (RuBP) . Regarding the incorrect options: RuBisCO has a much greater affinity for CO2 than for O2 when the CO2:O2 ratio is nearly equal ; photolysis of water is associated with Photosystem II, not RuBisCO ; and the biosynthetic phase (Calvin cycle) is dependent on the products of light reactions (ATP and NADPH), meaning it does not strictly occur 'only in the dark' .
This question aligns with the NEET BIOLOGY syllabus, specifically targeting concepts from Photosynthesis in Higher Plants . Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.
More Photosynthesis in Higher Plants Questions
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