A strand of DNA contains the bases adenine, cytosine, cytosine, and guanine, in that order. Which would be the order of the bases on the opposite strand of DNA?

In DNA, adenine pairs with thymine, and cytosine pairs with guanine. Matching each base in order—adenine, cytosine, cytosine, guanine—gives thymine, guanine, guanine, cytosine on the opposite strand. That is choice B.

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