DNA is an acid in the chromosomes in the centre of the cells of living things. DNA determines the particular structure and functions of every cell and is responsible for characteristics being passed on from parents to their children. DNA is an abbreviation for 'deoxyribonucleic acid'.
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Dna means deoxy ribo nucleic was discocverd by crick and watson.they discovered that dna molecule look rather like spring stair case,having a shape of double consists of alternate sugar and phosphate groups and steps which join the frame work together are pairs of chemical compounds called bases.they are adenine ,guanine,thymine and cytosine.