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.
A pyrimidine is a single ringed base. The three kinds are; Cytosine, Thymine (in Dna) and Uracil (only in Rna). A purine is a double ringed base. the two kinds are; Adenine and Guanine. Adenine pairs with Thymine in Dna-or Uracil in Rna; Guanine pairs with Cytosine in both Dna and Rna.yrimidines are just the 6 member ring you made in the purine. It is called a 1 3 diazine ring. Pyrimidines are the basis of the other nucleic bases in DNA and RNA called cytosine, uracil, and thymine. Pyrimidines have much lower boiling points and molecular masses than purines.