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JEE Main levelOne or more correct optionsDifficulty 2 of 3el021

Select all correct statements about receptors and their ligands.

  1. AA receptor binding site recognises its messenger by shape and chemical features.
  2. BAn agonist prevents the messenger from binding and gives no response.
  3. CAn antagonist can block the response to the natural messenger.
  4. DA molecule different from the natural messenger can still be an agonist.

Answer: A, C, D

Binding sites are specific (a true). An antagonist blocks the messenger (c true). A structurally different molecule that fits and activates the receptor is also an agonist (d true). An agonist activates, it does not block, so (b) is false.
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