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A nucleotide is composed of:

1.) A nitrogenous base (either a purine such as Adenine or Guanine, or a pyrimidine such as a Thymine or Cytosine; Uracil is the nitrogenous base that replaces Thymine in RNA)

2.) A ribose sugar (5 Carbon ring)

3.) A phosphate group

The nitrogenous base is attached to Carbon 1 on the ribose sugar while the phosphate group is attached to Carbon 5 of the same sugar. (That same phosphate group is attached to Carbon 3 of a neighboring sugar when forming a strand.)

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