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NUCLEIC ACIDS Nucleic tarts ar involved in the storage and transfer of inheritable information in entirely living organisms, including the simplest viruses. There nuclear number 18 2 types of nucleic acid in cells, Deoxyribonucleic acid (desoxyribonucleic acid) and Ribonucleic acid (ribonucleic acid). Nucleic acids atomic number 18 so named because deoxyribonucleic acid was 1st dislocated from nuclei, but both desoxyribonucleic acid and ribonucleic acid also turn over in former(a) parts of the cell, e.g. DNA is also appoint in mitochondria and chloroplasts, whilst ribonucleic acid is also institute in the cytoplasm, particularly at the ribosomes. both DNA and RNA argon polymers, the monomeric units being called nucleotides. DNA and RNA are and then polynucleotides. There are five-spot divers(prenominal) nitrogen-containing organic bases present in nucleic acids: adenine (A), guanine (G), wizard C (C), deoxythymidine monophosphate (T) and atomic number 92 (U). A, T, C and G are tack in DNA. A, U, C and G are found in RNA (uracil replaces thymine here). The nitrogenous bases belong to devil polar chemical families. angstrom unit and guanine are purine bases and put on a double-ringed complex personify part. Cytosine, thymine and uracil are pyrimidine bases and have a single-ringed body structure The gang of a sugar and a base forms a desegregate called a nucleoside. The addition of a phosphate group to this structure forms the nucleotide. Different nucleotides are organise according to the sugar and bases used. Cells infinitely produce nucleotides and these form a pool from which nucleotides can be used up as required for manufacturing DNA, RNA or a variety of new(prenominal) substances.

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