what is a small, independently replicating dna molecule within a cell, physically separated from chromosomal dna?

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16-12-2022
Biology

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what is a small, independently replicating dna molecule within a cell, physically separated from chromosomal dna?

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charithran8975 charithran8975 · Answer 1 · 2022-12-20T11:50:44-05:00

Bacteria and certain other microscopic species contain plasmids, which are tiny circular DNA molecules. Physically distinct from chromosomal DNA, plasmids multiply on their own.

A genetic component of a cell called a plasmid can multiply without the help of chromosomes. A little circular strand of DNA called a plasmid can be found in the cytoplasm of prokaryotic cells like bacteria or protozoa. DNA is present in both forms, although plasmid and chromosomal DNA are different. Integrative DNA fragments come from rapidly proliferating bacteria like E. coli or can be created using a PCR-based method; they contain flanking homologous sections, a selection marker, and a gene of interest but are unable to replicate on their own in the host cell. There is a unique "origin of replication" for each plasmid.

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