Question

If one strand of DNA has the base sequence AAGCAA, the complementary strand has which of the following sequences?

Options

• UUCGUU

• TICGTI

• AAGCAA

• UTCGTU

Answer 1

TICGTI

Explanation:

DNA strands are complementary based on specific base-pairing rules where Adenine (A) always pairs with Thymine (T), and Guanine (G) always pairs with Cytosine (C). To find the sequence of the second strand, you replace each base in the original sequence with its partner: the first two A bases pair with T, the G pairs with C, the C pairs with G, and the final two A bases pair with T.