Which statement about RNA is true?

Which statement about RNA is true?

• A. RNA is typically single-stranded and contains uracil.
• B. RNA is typically double-stranded and contains thymine.
• C. RNA is single-stranded and contains thymine.
• D. RNA is double-stranded and leaves the nucleus.

Answer: (A)

RNA is typically single-stranded and contains uracil. This distinguishes it from DNA, which is usually double-stranded and uses thymine. RNA's four bases are adenine, guanine, cytosine, and uracil, with uracil pairing with adenine. The single-stranded nature lets RNA fold into diverse shapes necessary for its roles in coding, regulation, and catalysis. While some RNA can form double-stranded regions in certain contexts, the common description is that RNA is single-stranded and contains uracil, making that statement true.

RNA is typically single-stranded and contains uracil. This distinguishes it from DNA, which is usually double-stranded and uses thymine. RNA's four bases are adenine, guanine, cytosine, and uracil, with uracil pairing with adenine. The single-stranded nature lets RNA fold into diverse shapes necessary for its roles in coding, regulation, and catalysis. While some RNA can form double-stranded regions in certain contexts, the common description is that RNA is single-stranded and contains uracil, making that statement true.