The most abundant protein in the whole biosphere is:

  • A
    Scleroprotein
  • B
    RuBisCO
  • C
    Collagen
  • D
    Keratin

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Which structure is formed by the interactions between different polypeptide chains?

Which element is generally absent in proteins?

Identify $X$ in the given chemical structure: $H_3N^+ - CH(R_1) - C(=O) - X - CH(R_2) - COO^-$.

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