Final answer:
DNA and RNA are nucleic acids that have structural differences. DNA is double-stranded and contains deoxyribose sugar, while RNA is single-stranded and contains ribose sugar. RNA replaces thymine with uracil.
Step-by-step explanation:
DNA and RNA are both nucleic acids, but they have several structural differences. DNA is double-stranded, while RNA is single-stranded. The sugar in DNA is deoxyribose, while the sugar in RNA is ribose. DNA contains the bases adenine (A), guanine (G), cytosine (C), and thymine (T), while RNA replaces thymine with uracil (U). Additionally, RNA molecules are generally shorter than DNA molecules.