1.

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.

Answer»

ASSERTION and reason both are correct statement but reason does not explain assertion. 
Assertion and reason both are correct and reason explains the assertion. 
Both assertion and reason are wrong statement.
Assertion is correct statement reason is wrong statement.

Solution :Assertion is correct statement reason is wrong statement.
Correct reason : Chemical messenger binds the RECEPTOR SITE and gives the message to the CELL without entering the cell.


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