Question

What are the purins and pyrimidine in DNA and RNA?
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Answer 1

Answer:

a representation of a DNA or RNA strand that includes stretches of letters, such as AGCCCTAG... or UCGGGAUC... Each of these five letters stands for a different nucleotide, and nucleotides come in two fundamental types, heavy in nitrogen and named on the basis of their chemical properties: purine and pyrimidine

There are four purines that are important in human molecular biology: adenine, guanine, hypoxanthine and xanthine. The first two of these are components of both DNA and RNA. The other two are not incorporated into any nucleic acids as final products, but they are intermediaries in the biochemical reactions in which purine nucleotides are synthesized and broken down.

Pyrimidines have a six-member nitrogen-containing ring, like purines, but no corresponding five-nitrogen ring. These compounds therefore have a longer name but are smaller and lighter in the physical world.

Pyrimidine bases in DNA include cytosine and thymine; pyrimidines in RNA include cytosine and uracil. Pyrimidine synthesis is the reverse of purine synthesis in one way: The free base is made first, and the rest of the molecule is modified into a nucleotide later.