47.With reference to double stranded DNA, the following ratio is always constant for all species A. A+T/G+C B. G C/A T C. Both a & b D. A+G/T+C
Option D Nucleic acids are essential biomacromolecules of the living cells. They are polymer of nucleotides. Nucleotides comprises of three basic units nitrogenous base, pentose sugar and phosphate. There are two types of nitrogenous bases purines and pyrimidines. Adenine (A) and Guanine (G) are purines whereas Cytosine (C), Uracil (U) and Thymine (T) are pyrimidines. Erwin Chargaff proposed two rules which are termed as Chargaff's rules. These are applicable for double helix DNA/RNA structure.First rule, in any double stranded DNA the number of guanine units equals the number of cytosine units and the number of adenine units equals the number of thymine units.
