Question

match the nitrogen base with its complement in rna. not all of them will be used.
adenine (a)
cytosine (c)
guanine (g)
uracil (u)
cytosine (c) thymine (t) uracil (u) guanine (g) adenine (a)

Explanation:

In RNA, base - pairing rules are as follows: Adenine (A) pairs with Uracil (U) through two hydrogen bonds. Cytosine (C) pairs with Guanine (G) through three hydrogen bonds. Thymine (T) is not present in RNA (it is in DNA, where it pairs with A).

Answer:

Adenine (A) - Uracil (U)
Cytosine (C) - Guanine (G)
Guanine (G) - Cytosine (C)
Uracil (U) - Adenine (A)