Nucleotides are the base units that make up DNA and RNA. The nucleotides that make up DNA include; Adenine (A), Thymine (T), Cytosine (C) and Guanine (G). The nucleotides are paired up in DNA in a complimentary fashion; A and T are always bound together and G and C are always bound together. This complimentary pairing is very important for DNA replication and protein synthesis and is the reason that nucleotides are commonly referred to as base pairs. The nucleotides that make RNA include; Adenine (A), Uracil (U), Cytosine (C) and Guanine (G).

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