Recombinant DNA is a technology scientists developed that made it possible to insert a human gene into the genetic material of a common bacterium. ... There, the recombinant bacteria use the gene to begin producing human insulin. Scientists harvest the insulin from the bacteria.
Carbon makes four electrons available to form covalent chemical bonds, allowing carbon atoms to form multiple stable bonds with other small atoms, including hydrogen, oxygen, and nitrogen. This allows carbon atoms to form a tremendous variety of very large and complex molecules.
I belive the correct answer is D
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