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Question
Which of the following statements are incorrect about receptor proteins?
(i) Majority of receptor proteins are embedded in the cell membranes.
(ii) The active site of receptor proteins opens on the inside region of the cell.
(iii) Chemical messengers are received at the binding sites of receptor proteins.
(iv) Shape of receptor doesn’t change during attachment of messenger.
Solution
(ii) The active site of receptor proteins opens on the inside region of the cell.
(iv) Shape of receptor doesn’t change during attachment of messenger.
Explanation:
Receptor proteins are embedded in the cell membrane and their active sites project outside region of the cell membrane. Shape of the receptor changes during the attachment of messenger.
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Match the class of compounds given in Column I with their functions given in Column II.
| Column I | Column II |
| (i) Antagonists | (a) Communicate message between two neurons and that between neurons to muscles |
| (ii) Agonists | (b) Bind to the receptor site and inhibit its natural function |
| (iii) Chemical messenger | (c) Crucial to body’s communication process |
| (iv) Inhibitors | (d) Mimic the natural messenger |
| (v) Receptors | (e) Inhibit activities of enzymes |
Assertion: Receptors are crucial to body’s communication process.
Reason: Receptors are proteins.
Assertion: Chemical messengers are chemicals that enable communication of message between two neurons or between neurons and muscles.
Reason: Chemicals enter the cell through receptor.
Assertion: Chemical messenger gives message to the cell without entering the cell.
Reason: Chemical messenger is received at the binding site of receptor proteins.
Assertion: Receptor proteins show selectivity for one chemical messenger over the other.
Reason: Chemical messenger binds to the receptor site and inhibits its natural function.
