Given below are two statements : One is labeled as Assertion (A) and the other is labeled as Reason(R)
Assertion (A) :The enzyme RuBisCO plays a dual role as a carboxylase or as an oxygenase.
Reason (R) : Its active site can bind to either CO ₂ or O ₂, depending on their relative concentration in the surrounding atmosphere.
Choose the correct answer from the options given below.

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Both (A) and (R) are correct but (R) is not the correct explanation of (A)

(A) is correct but (R) is not correct

Both (A) and (R) are false.

Both (A) and (R) are correct and (R) is the correct explanation of (A)

answer is B.

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Detailed Solution

RuBisCO, which is the most abundant enzyme in the world, is characterized by the fact that its active site can bind to both CO2 and O2 – hence the name. RuBisCO has a much greater affinity for CO2 when the CO2 : O2 is nearly equal. This binding is competitive. It is the relative concentration of O2 and CO2 that determines which of the two will bind to the enzyme.

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