variable component of nucleotides. Nitrogen containing ring structures of two basic types, pyrimidines (cytosine, thymine and uracil) and purines(adenine and guanine). Specific hydrogen bond form between nitrogen bases of nucleotides of the two antiparallel strands of nucleic acids.

component of a nucleotide that can bind to other nitrogen bases through a hydrogen bond

The basic component of nucleic acids; composed of a nitrogen-containing molecule of purine or pyrimidine.

A component of the nucleotides from which nucleic acids are made. It consists of a ring containing carbon, nitrogen, oxygen, and hydrogen.

Type of molecule that forms an important part of nucleic acid, composed of a nitrogen-containing ring structure. Hydrogen bonds between bases in opposing complementary strands link the two strands of a DNA double helix.