Q.What are the three structural differences between RNA and DNA?

Nucleic acids are long-chain polymers of repeating subunits called nucleotides, each built from three parts: a nitrogenous base, a five-carbon (pentose) sugar, and a phosphate group. The identity of the sugar distinguishes the two nucleic acids: DNA contains deoxyribose, RNA contains ribose, differing only in that deoxyribose lacks one oxygen atom (at the 2' carbon) that ribose retains. The nitrogenous bases fall into two chemical families: adenine (A) and guanine (G), double-ring purines, and thymine (T), cytosine (C) and uracil (U), single-ring pyrimidines; thymine occurs only in DNA and uracil only in RNA. The phosphate group, derived from phosphoric acid, carries a negative charge once incorporated into a nucleotide, giving nucleic acids their acidic character. A base attached to the sugar's 1' carbon forms a nucleoside; add …