Ans. DNA and RNA differ in several aspects. DNA is double-stranded, while RNA is usually single-stranded. DNA contains the sugar deoxyribose, while RNA contains ribose. DNA uses the nitrogenous bases adenine (A), thymine (T), cytosine (C), and guanine (G), whereas RNA uses adenine (A), uracil (U), cytosine (C), and guanine (G). DNA is primarily found in the nucleus, while RNA is found in the nucleus and cytoplasm.