What is one characteristic that makes RNA different from DNA?

RNA is characterized by being single-stranded, which distinguishes it from DNA that typically exists as a double-stranded helix. This single-stranded nature allows RNA to fold into various shapes and perform a wide range of functions within the cell, such as acting as a messenger between DNA and the ribosomes where proteins are synthesized. The flexibility of RNA being single-stranded is crucial for its roles in processes like transcription and translation, where it carries genetic information from the DNA to synthesize proteins.

In contrast, DNA's double-helix structure provides a stable platform for genetic information storage and replication. The other options imply inaccuracies in RNA's composition or structure: RNA does not contain thymine, and instead uses uracil; it also features ribose sugar rather than deoxyribose found in DNA.