Which nucleic acid contains the nitrogenous base uracil? A. RNA B. DNA and RNA C. DNA

Break Down the Problem

1. Identify the options provided: RNA, DNA and RNA, DNA.
2. Determine the presence of the nitrogenous base uracil in each option.

Relevant Concepts

• Nucleic acids are biomolecules essential for all known forms of life and are classified mainly into DNA (deoxyribonucleic acid) and RNA (ribonucleic acid).
• The nitrogenous bases in nucleic acids include adenine, guanine, cytosine, thymine, and uracil.
• DNA contains thymine, while RNA contains uracil instead of thymine.

Analysis and Detail

1. Option A: RNA - Contains uracil as one of its nitrogenous bases.
2. Option B: DNA and RNA - While it mentions RNA, DNA does not contain uracil, as it has thymine.
3. Option C: DNA - DNA does not contain uracil; it contains thymine instead.

Verify and Summarize

• The only nucleic acid that contains uracil is RNA.
• Since DNA does not have uracil and the presence of uracil in the second option is negated by the inclusion of DNA, we confirm that the correct answer is dedicated only to RNA.

Final Answer

A. RNA