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.
Therefore it is believed that actually thymine is a âprotectedâ form of uracil in DNA, that is simply methylated and does not get cut out. This enzyme does not do the same to RNA, so there was apparently no need for uracil to be replaced by thymine in the RNA.