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Manufacturing recombinant dna molecules involves cutting a gene from its normal location, inserting it into a circular piece of dna from a bacterial cell, and then transferring the circle of dna to cells of another species. which of the below describe the circular piece of dna?

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Answer: Plasmid.
A plasmid is a small DNA molecule within a bacteria cell that is separated from the chromosomal DNA and can replicate independently. Through Recombinant DNA, we can insert a gene that we want to see replicated in the plasmid, and when the bacteria multiplies, which it does often, we will obtain a lot of copies of  interest gene.