The complementary strand of 5-prime ATGCCG 3-prime, written in the 5-prime to 3-prime direction, is

A5-prime CGGCAT 3-prime
B5-prime TACGGC 3-prime
C5-prime GCCGTA 3-prime
D5-prime ATGCCG 3-prime

Answer: A

Complement base by base (A-T, T-A, G-C, C-G, C-G, G-C) gives 3-prime TACGGC 5-prime. Strands are antiparallel, so written 5-prime to 3-prime this is the reverse: CGGCAT.

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