Which of the following statements is correct?

  • A
    There are only $2$ types of enzymes.
  • B
    There are many types of proteins.
  • C
    $DNA$ consists of only four types of molecules.
  • D
    There are $80$ types of chromosomes.

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Which of the following is a monomer of protein?

The vitamin nicotinamide (Vitamin $B_3$) can be synthesized in our body from which of the following amino acids?

Which of the following is an aromatic amino acid?

What is formed by the combination of one or more polypeptide chains?

How many polypeptide chains are present in a single molecule of globin protein?

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