Which of the following is true about RNA?

A) The structure is a double helix.
B) The bases are held together by hydrogen bonds.
C) The bases are complementary to each other.
D) It contains deoxyribose sugar.
E) It is composed of the nucleotides adenine, guanine, cytosine, and uracil.

RNA is composed of the nucleotides adenine, guanine, cytosine, and uracil. RNA has a single-stranded structure, and the bases are held together by hydrogen bonds. The complementary base pairing occurs between RNA and DNA, as well as between RNA molecules during processes like transcription and RNA folding. The sugar in RNA is ribose, which is different from the deoxyribose sugar found in DNA. RNA is involved in various biological processes, including gene expression and protein synthesis.