If a DNA strand has the sequence TAC GCA TAT, what is the complementary DNA strand?

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Multiple Choice

If a DNA strand has the sequence TAC GCA TAT, what is the complementary DNA strand?

Explanation:
Base pairing pairs A with T and C with G, so to get the complementary strand you replace each base with its partner: T→A, A→T, C→G, G→C, and do this across the whole sequence. TAC GCA TAT becomes ATG CGT ATA, which is the strand that would pair with the original. The other sequences don’t follow these base-pairing rules, so they aren’t correct complements.

Base pairing pairs A with T and C with G, so to get the complementary strand you replace each base with its partner: T→A, A→T, C→G, G→C, and do this across the whole sequence. TAC GCA TAT becomes ATG CGT ATA, which is the strand that would pair with the original. The other sequences don’t follow these base-pairing rules, so they aren’t correct complements.

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