The base sequence of the strand of DNA complementary to the segment 5' T-G-G-C-A-A-C 3' is
A)3' T-G-G-C-A-A-C 5'.
B)3' A-C-C-G-T-T-G 5'.
C)3' A-C-C-G-U-U-G 5'.
D)3' U-C-C-G-T-T-G 5'.
E)3' A-C-G-C-T-U-G 5'.

Question

Quizplus · Accepted Answer

The complementary DNA strand must have the opposite base pairs to the original strand. T (thymine) pairs with A (adenine), and C (cytosine) pairs with G (guanine). Therefore, the complementary strand of the segment 5' T-G-G-C-A-A-C 3' would be 3' A-C-C-G-T-T-G 5'. Choice A is incorrect because it is the same as the original strand. Choice C is incorrect because U (uracil) is not found in DNA, only in RNA. Choice D is incorrect because DNA does not have U, only T. Choice E is incorrect because it contains a U instead of T.

The Base Sequence of the Strand of DNA Complementary to the Segment