Question

on an rna molecule, which would base pair with adenine?
thymine
guanine
cytosine
uracil

Explanation:

In RNA, the base - pairing rules are that adenine (A) pairs with uracil (U), and cytosine (C) pairs with guanine (G). Thymine is found in DNA (where adenine pairs with thymine), not in RNA for this base - pairing with adenine. Guanine pairs with cytosine, and cytosine pairs with guanine. So among the given options, uracil is the one that base - pairs with adenine in an RNA molecule.

Answer:

D. uracil