Which of the following statements about enzymes are true?
$i$. Enzymes lack nucleophilic groups.
$ii$. Enzymes are highly specific both in binding chiral substrates and in catalyzing their reactions.
$iii$. Enzymes catalyze chemical reactions by lowering the activation energy.
$iv$. Pepsin is a proteolytic enzyme.

  • A
    $i$ and $iv$
  • B
    $i$ and $iii$
  • C
    $ii$,$iii$ and $iv$
  • D
    $i$

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