Question

how are dna and rna similar?
a. they are both double stranded.
b. they both contain thymine in their structures.
c. they both consist of nucleic acids.
d. they both have uracil as a possible base.

Explanation:

• Option A: DNA is double - stranded, but RNA is usually single - stranded. So this option is incorrect.
• Option B: DNA contains thymine (\(T\)), while RNA contains uracil (\(U\)) instead of thymine. So this option is incorrect.
• Option C: Both DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are nucleic acids. DNA is composed of deoxyribose sugar, phosphate, and nitrogenous bases (\(A\), \(T\), \(C\), \(G\)), and RNA is composed of ribose sugar, phosphate, and nitrogenous bases (\(A\), \(U\), \(C\), \(G\)). This option is correct.
• Option D: Uracil (\(U\)) is only present in RNA, not in DNA. So this option is incorrect.

Answer:

C. They both consist of nucleic acids.