Question

What replaces thymine in RNA?

• A. Guanine
• B. Adenine
• C. Uracil
• D. Water

Answer 1

The correct option is C Uracil

In RNA, uracil binds to adenine via two hydrogen bonds. In DNA, the uracil nucleobase is replaced by thymine. Uracil could be considered a demethylated form of thymine. Each nucleotide in RNA contains a ribose sugar, with carbons numbered 1' through 5'. A base is attached to the 1' position, in general, adenine (A), cytosine (C), guanine (G), or uracil (U). Adenine and guanine are purines, cytosine and uracil are pyrimidines.

So, the correct answer is option C.