How many polypeptide chains are present in the structure of hemoglobin?

  • A
    Two
  • B
    Four
  • C
    Six
  • D
    Eight

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Name the main constituent of the food,in the absence of which one cannot live.

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Column $I$ Column $II$
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$(b)$ Immunoglobulin $(ii)$ Immunity
$(c)$ Melanin $(iii)$ Pigmentation of the body
$(d)$ Hemoglobin $(iv)$ Muscle movement

Biological diversity of amino acids is due to the presence of . . . . . . .

Which of the following macromolecules is found in the structure of hormones and enzymes?

Amino acids with polar and negatively charged '$R$' groups are ..........

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