Answer:
A plasmid is usually a
circular (sometime linear), double stranded DNA, that can replicate^autonomously.
These are found in the cytoplasm of the bacterial cell, plasm.dsnormally remain
separated from the chromosome, but sometimes may integrate into ittemporarily
and replicate with it incidentally.
Role of Plasmids in
Bacteria
Plasmids are
the extra chromosomal circular, independently replicating unit besidesnucleoid
in the bacterial cell.
Plasmids are
used to transfer the information from one cell to another, i.e., transfer of
important genes (e.g., they may confer resistance of particular, antibiotics to
their bacterialcells), enable to metabolize a nutrient, which normally a
bacteria is unable to. It also helps inconjugation of bacteria. These days,
plasmids are used in a variety of recombinationexperiments, as cloning vectors.
A such example of plasmid vector is given below in figure.
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