Final answer:
The three parts of a nucleotide, the monomer of nucleic acids, are a nitrogenous base, a pentose sugar, and a phosphate group. The nitrogenous base can be one of four types: adenine (A), cytosine (C), guanine (G), or thymine (T) in DNA or uracil (U) in RNA.
Step-by-step explanation:
The three parts of a nucleotide, the monomer of nucleic acids, are a nitrogenous base, a pentose sugar, and a phosphate group. The nitrogenous base can be one of four types: adenine (A), cytosine (C), guanine (G), or thymine (T) in DNA or uracil (U) in RNA. The pentose sugar in DNA is 2-deoxyribose, while in RNA it is ribose. The phosphate group is attached to the 5' carbon of the pentose sugar.