Which statement about $\mathrm{RNA}$ is correct?

• A. $\mathrm{RNA}$ is typically double-stranded.
• B. $\mathrm{RNA}$ contains the base uracil instead of thymine.
• C. $\mathrm{RNA}$ contains the sugar $\mathrm{deoxyribose}$.
• D. $\mathrm{RNA}$ is more stable than $\mathrm{DNA}$ under alkaline conditions.

Answer: (B)

Verified step by step guidance

1. Identify the key components of RNA: RNA is a nucleic acid similar to DNA but with some distinct differences.
2. Understand the structure of RNA: RNA is typically single-stranded, unlike DNA which is double-stranded.
3. Examine the bases in RNA: RNA contains the base uracil (U) instead of thymine (T), which is found in DNA.
4. Consider the sugar component: RNA contains ribose sugar, whereas DNA contains deoxyribose sugar.
5. Evaluate the stability: RNA is generally less stable than DNA under alkaline conditions due to the presence of the hydroxyl group on the ribose sugar.