Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Enzymes are highly specific in their action, generally catalyzing only one particular reaction. Reason (R): Enzymes are globular proteins possessing specific active sites on their surface where only a specific substrate can fit. In the light of the above statements, choose the most appropriate answ

Step-by-step solution

Assertion (A) is true. Enzymes are highly specific catalysts; almost all enzymes catalyze only one particular reaction for a particular substrate. Reason (R) is also true and correctly explains the Assertion. Chemically, almost all enzymes are globular proteins. They have specific shapes and possess active sites on their surface. These active sites have specific geometry where only a substrate molecule with a complementary shape can fit (similar to a lock and key mechanism). This structural complementarity is the r