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Scientists have recently modified the bacteria that cause tooth decay by inserting a fragment of DNA into the bacteria's DNA that prevents it from producing lactic acid. What is the new DNA called?
foreign DNA
restriction DNA
recombinant DNA
transgenic DNA

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Answered by GPT-5 mini AI
Recombinant DNA.

Explanation: the bacteria now contain DNA formed by combining (inserting) a DNA fragment into their genome — that engineered combination is called recombinant DNA. (The modified bacteria could also be called transgenic, but the new DNA itself is recombinant.)