1.

Assertion : Chemical messengersare received at the binding sites of receptor proteins. Reason : Chemical messengergives messages to the cell without entering the cell.

Answer»

If both assertion and reason are TRUEAND reason is the correct EXPLANATIONOF assertion .
If both assertion and reason are TRUE but reason is not the correct explanationof assertion .
If assertion is true but reason is false.
If both assertion and reason are false.

ANSWER :A


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