Some are further divided into subtypes. â¢ OCA1, or tyrosinase-related albinism, results from a genetic defect in an enzyme called tyrosinase. This enzyme helps the body to change the amino acid, tyrosine, into pigment. (An amino acid is a âbuilding blockâ of protein.) There are two subtypes of OCA1.
Pyrimidine is group of molecules that are part of the DNA and RNA structure. These molecules feature a single ring structure made of six atoms. There are several pyrimidine molecules, but only cytosine and thymine are part of the DNA structure, while cytosine and uracil are part of the RNA structure. These molecules bind with their purine counterparts to join the two strands of the DNA or RNA polymer.
The purines are made up of two-carbon nitrogen ring bases with four nitrogen atoms while the pyrimidines are made up of one-carbon nitrogen ring bases with two nitrogen atoms. These two compounds serve as building blocks for a wide variety of organic compounds that can be found in nature and in our bodies.n microbiology, there are two types of nitrogenous bases that make up the two different kinds of nucleotide bases in DNA and RNA. These two types are called purines and pyrimidines.