Question

some bacteria extra circular DNA pieces are followed what are they called​

Answer 1

Explanation:

Small pieces of DNA, such as human DNA, can be attached to appropriate elements, circularized, and then introduced into bacteria, where they are propagated--or in other words, copied--along with the host bacterial chromosome. These small circles containing the cloned DNA are called plasmids

Answer 2

Explanation:

A plasmid is a small, extrachromosomal DNA molecule within a cell that is physically separated from chromosomal DNA and can replicate independently. They are most commonly found as small circular, double-stranded DNA molecules in bacteria; however, plasmids are sometimes present in archaea and eukaryotic organisms.