What is the number of $-COOH$,$-NH_2$,$-H$,and $-R$ groups respectively in the structure of an amino acid?

  • A
    $1, 1, 1, 1$
  • B
    $1, 2, 1, 1$
  • C
    $1, 1, 2, 1$
  • D
    $1, 1, 1, 2$

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The most abundant protein in the whole biosphere is:

Which of the following is a macromolecular protein?

Which of the following groups consists of amino acids with non-polar $R$ groups?

$S$ - Statement: Proteins are called conjugated proteins when they are associated with substances other than amino acids.
$R$ - Reason: Chlorophyll is essential for photosynthesis.

Identify the type of bond formed between the carboxyl group of one amino acid residue and the amino group of another amino acid residue.

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