Describe structurally the tautomeric forms of purine and pyrimidine bases and schematically represent the formation of a mutant DNA due to tautomeric shift.

The fact that a purine base always paired through hydrogen bonds with a pyrimidine base leads to, in the DNA double helix

This question has statement I and Statement II. Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement-I: Solubility of AgCN in acidic solution is greater than that in pure water. Statement-II: Solubility equilibria of AgCN in water is shifted in forward direction due to formation of HCN.

Glycosidic bonds exist in DNA molecule between (a) Sugar and phosphate (b) Any two nitrogen bases (c) Sugar and nitrogen base (d) Purines and pyrimidines