Nucleosides (Nucleic Acids)

2.11.4 Nucleosides (Nucleic Acids)

These naturally occurring substances are of prime biological importance and essentially possess three vital components namely: first, a sugar moiety e.g.; ribose or 2-desoxyribose; secondly, a purine or pyrimidine base e.g.; adenine, guanine and cytosine; and thirdly, a phosphoric acid. A base-sugar unit is known as a nucleoside, whereas a base-sugar phosphoric acid unit is known as nucleotide. An example of a nucleotide and a nucleoside is given here under:

nucleotide
Nucleotide : An odenylic acid unit of RNA
Nucleoside : Adenosine with the adenine as the heterocyclic base.

comment 0 nhận xét:

Post a Comment

 
© Pharmacognosy | Plants | herbal | herb | traditional medicine | alternative | Botany | © Copyright 2012 ; Email: epharmacognosy@gmail.com