Question

which of the following difference between dna and rna allows them to perform their unique functions?
○ dna contains ribose, while rna contains deoxyribose.
○ dna is single - stranded, whereas rna is double - stranded.
○ dna contains thymine, while rna contains uracil.
○ rna is found only in the nucleus, while dna is found only in the cytoplasm.

Explanation:

• Analyze each option:
• Option 1: DNA has deoxyribose, RNA has ribose (not vice versa), so this is incorrect.
• Option 2: DNA is double - stranded, RNA is single - stranded (not vice versa), so this is incorrect.
• Option 3: DNA contains thymine (T) and RNA contains uracil (U) instead of thymine. This difference in nitrogenous bases is related to their functions (e.g., DNA's stability for storage, RNA's role in translation).
• Option 4: DNA is mainly in the nucleus, RNA is in nucleus and cytoplasm (not vice versa), so this is incorrect.

Answer:

C. DNA contains thymine, while RNA contains uracil.