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The correct match between Item I and Item II is: Item I (A) Allosteric effect (B) Competitive inhibitor (C) Receptor (D) Poison Item II (P) M molecule binding to the active site of enzyme (Q) M molecule crucial for communication in the body (R) M molecule binding to a site other than the active site of enzyme (S) M molecule binding to the enzyme covalently (1) (A)→(P); (B)→(R); (C)→(Q); (D)→(S) (2) (A)→(P); (B)→(R); (C)→(S); (D)→(Q) (3) (A)→(R); (B)→(P); (C)→(S); (D)→(Q) (4) (A)→(R); (B)→(P); (C)→(Q); (D)→(S)

1. (A)→(P); (B)→(R); (C)→(Q); (D)→(S)
2. (A)→(P); (B)→(R); (C)→(S); (D)→(Q)
3. (A)→(R); (B)→(P); (C)→(S); (D)→(Q)
4. (A)→(R); (B)→(P); (C)→(Q); (D)→(S)

Correct answer: (A)→(R); (B)→(P); (C)→(Q); (D)→(S)

Solution

Allosteric effect -> binding to a site other than the active site (R); competitive inhibitor -> binding to the active site (P); receptor -> molecule crucial for communication (Q); poison -> binding covalently (S). So (A)->R, (B)->P, (C)->Q, (D)->S.

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