nucleotides

Nucleotides are the basic units that make up the long molecule of DNAs.

Each nucleotide is made up of three different parts: 1. a phosphate group 2. a 5-carbon sugar molecule called deoxyribose 3. and a nitrogeneous (nitrogen-containing) base.

Grey: deoxyribose // Blue: Phosphate group.

There are four kinds of nitrogenous bases in DNA. Adenine and Guanine bases have 2 rings. Cytosine and Thymine bases only have 1 ring.

Neucleotides string together like letters in the alphabet to create DNA.