Assertion (A) Receptor proteins show selectivity for one chemical messenger over the other.
Reason (R) Chemical messenger binds to the receptor site and inhibits its natural function.
1. Assertion and reason both are correct statements but reason does not explain assertion.
2. Assertion and reason both are correct and reason explains the assertion.
3. Both assertion and reason are wrong statements.
4. Assertion is the correct statement reason is the wrong statement.
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