In terms of $DNA$ and $RNA$ structure, what is a nucleotide?

  • A

    A nucleotide is a heterocyclic base.

  • B

    A nucleotide is a sugar molecule covalently bonded to a heterocyclic base.

  • C

    A nucleotide is a sugar molecule bonded to phosphate group and a heterocyclic base.

  • D

    A nucleotide is a heterocyclic base bonded to phosphate group.

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