All of the following statements apply to proteins except

  • A
    Proteins generally have no definite melting point
  • B
    Proteins contain the grouping $-CONH-$
  • C
    Proteins have high molecular weight
  • D
    Proteins can only contain the elements $C, H, O$ and $N$.

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The amino acid containing an indole part is

Assertion $(A)$: In aqueous solution,$\alpha$-amino acids exist as an internal salt called a zwitter ion.
Reason $(R)$: Proline is a natural amino acid having a secondary amino group. The correct option among the following is:

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