Question

Adenine (a) cytosine (c) guanine (g) thymine (t) uracil (u) DNA can make exact copies of itself through replication because the nitrogen bases ALWAYS pair A) a-t and c-g. B) a-u and c-g. C) a-c and t-g. D) c-g and t-u.

Answer 1

The answer is A. I don't think you need to know the chemistry of why they go together but I will tell you that uracil is only used in RNA which is why B is wrong. C and D just don't happen.

Answer 2

A) a-t and c-g.

Step-by-step explanation:

According to Erwin Chargaff, a biochemist the amounts of the purine and pyrimidine bases (Adenine, Thymine, Cytosine and Guanine) are in equal quantities. This means that the amount of adenine is equal to the amount of thymine, and the amount of cytosine is equal to the amount of guanine. During DNA replication base pairing is specific. Adenine (A) always pairs with thymine (T) and cytosine (C) always pairs with guanine (G).