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Pyrimidine is an aromatic heterocyclic organic compound similar to pyridine. One of the three 2 positions). In nucleic acids, three types of nucleobases are pyrimidine derivatives: cytosine (C), thymine (T), and uracil (U). It is also found in many synthetic compounds such as barbiturates and the HIV drug, zidovudine. There are two kinds of nitrogen-containing bases - purines and and the endproduct of purine catabolism, which is uric acid in man, may serve. Purine contains two carbon-nitrogen rings and four nitrogen atoms. Purines have high meting point. Pyrimidines contains one carbon-nitrogen.

Double-ringed Purine / Single-ringed Pyrimidine bases. The purines are G The pyrimidines in DNA are C & T. In RNA, U replaces T; thymine is 5-methyl-uracil. In DNA, there are four different bases: adenine (A) and guanine (G) are the larger purines. Cytosine (C) and thymine (T) are the smaller pyrimidines. RNA also. There are many derivatives of this structure through the addition of one or The three pyrimidine nitrogenous bases, thymine (T), cytosine (C), and uracil (U).

According to Chargaff's rules which states that DNA from any cell of all organisms should have a ratio (base Pair Rule) of Purine and Pyrimidine bases, i.e. (Elements & Compounds) Also called: pyrimidine base any of a number of similar compounds having a basic structure that is derived from pyrimidine, including. Purines and pyrimidines are the two families of nitrogenous bases that While they are similar in many respects, there are a number of key. A base pair is one of the pairs A-T or C-G. Notice that each base pair consists of a purine and a pyrimidine. The nucleotides in a base pair are complementary.