A DNA strand has a region with the sequence ATCGGAT. Which of the following would be a complementary strand?
a. CGATACGT
b. TAGCCTAG
c. TUGCCTUG
d. UAGCCUAG
ANS: B
The consistent pairing of adenine with thymine and of guanine with cytosine is known as com-plementary base pairing; thus, A complements to T and C to G and vice versa throughout the strand. A complements to T; thus, the first letter must be a T. U does not represent a complement in the sequence.
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