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 a phosphate group and a heterocyclic base.
  • D
    $A$ nucleotide is a heterocyclic base bonded to a phosphate group.

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