$A$ molecule that binds to a receptor and induces post-receptor events in a cell is called ...$A$... and a molecule that binds to the receptor and inhibits all post-receptor events is called ...$B$....

  • A
    $A$-antagonist,$B$-agonist
  • B
    $A$-agonist,$B$-enzyme
  • C
    $A$-antagonist,$B$-hormone
  • D
    $A$-agonist,$B$-antagonist

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