Select the correct statement amongst the following. (a) Antagonists are the substances which inh...

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Select the correct statement amongst the following.
(a) Antagonists are the substances which inhibit the natural function of receptor site.
(b) Agonists are the drugs that mimic the natural messenger by switching on the receptor.
(c) Substrates may bind to active site of enzyme through a variety of interactions such as ionic bonding, H-bonding, Van der Waals interaction or dipole-dipole interaction.
(d) All of these
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