Which bases pair with which?

Answer 1

For DNA:

Adenine to Thymine,

Cytosine to Guanine.

For RNA:

The only thing that changes is that there is no thymine. It is replaced with uracil. So you simply replace the thymine with the uracil.

Answer 2

Adenine pairs with Guanine. Cytosine pairs with Thymine.

Answer 3

In DNA, adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C) through hydrogen bonding. In RNA, adenine still pairs with uracil (U), and guanine still pairs with cytosine.