KERALA UNIVERSITY COLLEGE & TEACHER EDUCATION NEDUMANAGADU, THIRUVANANTHAPURAM 2013-2014

ASWATHY IG NATURAL SCIENCEREG NO: 13983009

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DNA (Deoxyribonucleic acid)

The structure of part of a DNA  DOUBLE HELIX

Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions used in the development and functioning of all known living organisms and some viruses.

The main role of DNA molecules is the long-term storage of information.

DNA usually occurs as linear  chromosomes in eukaryotes, and circular chromosomes in prokaryotes.

A single strand of a DNA molecule consists of a chain of nucleotide subunits.

Each nucleotide is made of the sugar deoxyribose connected to an inorganic phosphate group, and to one of four nitrogenous bases(Adinine , Guanine, Cytocine, Thymine).

The phodiester bonds that link the nucleotide subunits to each other attach phosphate group of one nucleotide to the deoxyribose sugar of the preceding nucleotide

DNA replication is the process of producing two identical replicas from one original DNA molecule.

DNA REPLICATION

DNA is made up of two strands and each strand of the original DNA molecule serves as template for the production of the complementary strand, a process referred to as semi conservative replication

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