Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion : Chemical messenger gives message to the cell without entering the cell.

Reason : Chemical messenger is received at the binding site of receptor proteins.

• In case of living organisms communications b/w cells is very important and it occurs via receptors .

• In the body, message b/w neurons & neuron-muscles is communicated by a chemical substance called chemical messengers.

• These chemical messengers are generally received at the binding sites of the receptor proteins.

• In order to put up a message , shape of the receptor changes resulting the transfer of message into the cell & by the process the messengers give message to cells without even entering the cell.