Which option correctly lists three major ways RNA differs from DNA?

• A. RNA typically contains ribose, uses uracil (U) instead of thymine (T), and is usually single-stranded rather than double-stranded.
• B. RNA typically contains deoxyribose, uses uracil (U) instead of thymine (T), and is always single-stranded.
• C. RNA typically contains ribose, uses thymine (T) instead of uracil (U), and is always double-stranded.
• D. RNA typically contains deoxyribose, uses thymine (T) instead of uracil (U), and is usually double-stranded rather than single-stranded.

Answer: (A)

Verified step by step guidance

1. Identify the sugar component in RNA and DNA. RNA contains ribose sugar, whereas DNA contains deoxyribose sugar. This difference affects the stability and structure of the nucleic acids.
2. Examine the nitrogenous bases used in RNA and DNA. RNA uses uracil (U) instead of thymine (T), which is found in DNA. This substitution is a key distinguishing feature between the two molecules.
3. Consider the strand structure of RNA and DNA. RNA is usually single-stranded, allowing it to fold into various shapes, while DNA is typically double-stranded, forming a stable double helix.
4. Compare each option against these three criteria: sugar type (ribose vs. deoxyribose), base composition (uracil vs. thymine), and strand structure (single vs. double).
5. Select the option that correctly states RNA contains ribose, uses uracil instead of thymine, and is usually single-stranded.