Which of the following groups are present in the structure of an amino acid?

  • A
    Carboxyl group $(-COOH)$,amino group $(-NH_2)$,hydrogen group $(-H)$,and variable group $(-R)$
  • B
    Carboxyl group $(-COOH)$,amino group $(-NH_2)$,and hydrogen group $(-H)$
  • C
    Carboxyl group $(-COOH)$ and amino group $(-NH_2)$
  • D
    Carboxyl group $(-COOH)$

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