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DNA is the largest biomolecule.DNA molecule is a long, double chain of deoxyribonucleotide units.The two deoxyribonucleotide chains are unbranched and are twisted around a common axis to form a right-handed double helix that encloses a cylindrical space inside it.DNA consists of 3 different molecules:
Deoxyribose sugar (C₅H₁₀O₄) and
Nitrogenous base
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DNA is double stranded helix in which each strand is made up of thousands of deoxyriboes nucleotides. Watson and Crick proposed the structure of DNA molecule . The quantity of DNA in each doploid cell is constant.