Nucleotides always join to their complementary bases. In this case, the sequence starts with T, which means <u>thymine,</u> and T is always complementary to A, which means <u>adenine</u>. This works both ways. Likewise, the G base of the sequence means <u>guanine</u>, and it will always be complemented with C, <u>cytosine</u>, also working the other way around.
