DNA, also called as deoxyribonucleic acid, is an organic chemical which has complex molecular structure and it is found in all the cells whether prokaryotic or eukaryotic and also found in many viruses. DNA codes genetic information for the transmission of all the inherited traits. DNA carries genes on it which are necessary for the transfer of genetic information from parent organisms to the daughter organisms.
This important chemical DNA was discovered for the first time in 1869, but the fact that it plays a significant role in genetic inheritance was not known until 1943. In the year 1953 two colleagues working together James Watson and Francis Crick, assisted by the work of biophysicists Rosalind Franklin and Maurice Wilkins, determined that the structure of DNA is like a double-helical polymer, a spiral consisting of two DNA strands running anti-parallel to each other and are wound around each other. The breakthrough led to significant advances in scientists’ understanding of DNA replication as well as hereditary control of cellular activities.
Each strand of a DNA molecule is made up of a long chain of monomer called mono-nucleotides. The nucleotides of DNA comprises of a deoxyribose (one oxygen removed from carbon at position 3), pentose sugar molecule to which is attached a phosphate group and one of four nitrogenous bases, bases in DNA molecule are
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