Which statement correctly describes a key difference between DNA and RNA?

• A. DNA is usually single-stranded and uses uracil, whereas RNA is usually double-stranded and uses thymine.
• B. DNA typically contains deoxyribose sugar and thymine, whereas RNA typically contains ribose sugar and uracil.
• C. DNA typically contains ribose sugar and uracil, whereas RNA typically contains deoxyribose sugar and thymine.
• D. DNA is translated into protein by ribosomes, whereas RNA stores long-term genetic information in chromosomes.

Answer: (B)

Verified step by step guidance

1. Identify the structural components that differentiate DNA and RNA, focusing on their sugar molecules and nitrogenous bases.
2. Recall that DNA contains deoxyribose sugar, which lacks one oxygen atom compared to ribose sugar found in RNA.
3. Remember that DNA uses thymine (T) as one of its four nitrogenous bases, while RNA uses uracil (U) instead of thymine.
4. Consider the typical strand structure: DNA is usually double-stranded forming a double helix, whereas RNA is usually single-stranded.
5. Understand the functional roles: DNA stores long-term genetic information, while RNA plays various roles including acting as a messenger and participating in protein synthesis.