The insertion of the human insulin gene into the bacterium Escherichia coli allowed it to produce human insulin. Which type of organism is E. coli?

E. coli received a gene from a different species—the human insulin gene—so it contains foreign genetic material. An organism with a gene from another organism inserted into its DNA is called a transgenic organism. E. coli is not the vector here; it is the organism producing insulin after the gene was inserted.

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