Question

how do rna and dna molecules differ?
select the two answers that are correct.
□ rna has one fatty acid chain, whereas dna has two of them.
□ rna contains sugars in its backbone, whereas dna does not.
□ adenine is used in rna, whereas cytosine is used in dna.
□ rna is single - stranded, whereas dna is double - stranded.
□ uracil is used in rna, whereas thymine is used in dna.

Explanation:

• Option D is correct: RNA is typically single-stranded, while DNA is a double helix (double-stranded).
• Option E is correct: RNA uses uracil (U) as a nitrogenous base, while DNA uses thymine (T) instead.
• Other options are incorrect: Both have sugar-phosphate backbones (RNA has ribose, DNA has deoxyribose); neither has fatty acid chains; both use adenine and cytosine.

Answer:

D. RNA is single-stranded, whereas DNA is double-stranded., E. Uracil is used in RNA, whereas thymine is used in DNA.