KEGS Biology Blog


Thursday 18th October 2012 Section 3
October 18, 2012, 9:27 am
Filed under: Uncategorized

Nucleotides

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DNA = Deoxyribonucleic acid. It is made of 2 hydrogen bonded chains of Nucleotides coiled into a double-helix.
Nucleotides are the monomers of nucleic acids. They are made up of Deoxyribose, a pentose sugar, bonded covalently to a Nitrogenous base and a Phosphate group (by a phosphodiester bond)
Nucleotides in DNA can have one of 4 nitrogenous bases – Thymine, Adenine, Guanine, and Cytosine. The specific sequence of these bases forms the genetic code for sequencing individual amino acids, to make specific proteins. They form complementary pairs, with T and A only bonding together and G and C bonding only together. (The nitrogenous bases bond by hydrogen bonds)
A chain of nucleotides has a Sugar-Phosphate backbone, with each Phosphate group bonding with two nucleotides, joining them. The nitrogenous bases project from the backbone.

Comment by kuranpahwa




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