NEET · Biology · STD 11 - 11. photosynthesis in higher plants

Which of the following statements about RuBisCO is true?

A It is active only in the dark
B It has higher affinity for oxygen than carbon dioxide
C It is an enzyme involved in the photolysis of water
D It catalyzes the carboxylation of RuBP

Verified Solution

Answer & Solution

Correct Answer

(D) It catalyzes the carboxylation of RuBP

Step-by-step Solution

Detailed explanation

Carboxylation is the most crucial step of the Calvin cycle where \(\mathrm{CO}_2\) is utilised for the carboxylation of RuBP. This reaction is catalysed by enzyme RuBP carboxylase. Since this enzyme also has an oxygenase activity, RuBisCO has higher affinity for carbon dioxide than oxygen.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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(c) Frederick Griffith	(iii) Loosely packed and light-stained
(d) Heterochromatin	(iv) DNA as genetic material confirmation

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