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?

DNA bases pair by a specific rule: adenine pairs with thymine, and cytosine pairs with guanine. So the opposite strand for adenine, cytosine, cytosine, guanine is thymine, guanine, guanine, cytosine. That is choice C.

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