What are plasmids? Describe their role in bacteria.

(N/A) Plasmids are small,circular,double-stranded $DNA$ molecules that are distinct from a cell's chromosomal $DNA$.
They are found in the cytoplasm of bacterial cells and are capable of autonomous replication.
Role in bacteria:
$1$. Antibiotic Resistance: Plasmids often carry genes that provide resistance to antibiotics,allowing bacteria to survive in hostile environments.
$2$. Genetic Exchange: They facilitate horizontal gene transfer between bacteria through processes like conjugation.
$3$. Virulence Factors: Some plasmids carry genes that enhance the pathogenicity or virulence of the bacteria.
$4$. Metabolic Functions: They may contain genes for the degradation of complex organic compounds,aiding in bacterial metabolism.