Why do bacteria have plasmids?

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Alireza Mordadi

Look at this:

http://www.biotecharticles.com/Others-Article/Plasmids-Types-Functions-and-Applications-187.html

but consider that is a very extensive subject that not reached by even several review article.

Dear Mariel

About that you said, toxin-antitoxin system that encoded by plasmid is very important, and in many way this system do not allow to bacteria loosing plasmid.

Eiman Syed

heavy metal resistance as well