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.
I presume that the RNA nucleotide containing uracil as its nitrogenous base is more stable than the RNA nucleotide containing thymine. This must be vice versa with DNA. RNA or DNA nucleotides containing either thymine or uracil are all complementary to DNA or RNA nucleotides containing Adenine. It is therefore all to do with probability of occurence of the more stable form, and of inclusion in the polynucleotide that is subsequently created. duncrhodes Â· 10 years ago.