Which of the following is a circular DNA from bacteria that can hold a foreign gene?

plasmid

restriction enzyme

ligase

protein expression


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Plasmids
A plasmid is a small, circular, double-stranded DNA molecule that is distinct from a cell's chromosomal DNA. Plasmids naturally exist in bacterial cells, and they also occur in some eukaryotes. Often, the genes carried in plasmids provide bacteria with genetic advantages, such as antibiotic resistance.