The color wheel is made up of three different types of colors - Primary, Secondary, and Tertiary. The primary colors are red, yellow, and blue. They are called primary for a couple of reasons. First, no two colors can be mixed to create a primary color.
RNA contains uracil and DNA Thymine. RNA has five bases, but DNA only four. DNA contains a deoxyribose sugar, but RNA contains ribose sugar. DNA is a double strand of nucleotides, but RNA a single strand.
The bases, separated into two different groups, known as the purines and the pyrimidines are illustrated below in terms of their chemical makeup. (Also included in this diagram is Uracil, which although closely related to thymine, is actually a part of the RNA molecule, as opposed to the DNA molecule.