Which structure provides some extra properties to bacteria like resistance to antibiotics?
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The discovery that antibiotics can treat bacterial infections dramatically changed human health, and many once deadly infections are now curable. Yet often we hear about bacteria that are no longer killed effectively by antibiotics. These bacteria are known as antibiotic resistant, and they’re a growing problem in medicine.
Frequent antibiotic use over long periods of time puts selective pressure on bacteria, and causes resistance to spread. When an antibiotic is used to treat a typical bacterial infection, most bacteria are killed. Sometimes, however, a bacterium with an advantage lives. This bacterium can then reproduce and pass its advantage on, creating many more antibiotic resistant bacteria.
Frequent antibiotic use over long periods of time puts selective pressure on bacteria, and causes resistance to spread. When an antibiotic is used to treat a typical bacterial infection, most bacteria are killed. Sometimes, however, a bacterium with an advantage lives. This bacterium can then reproduce and pass its advantage on, creating many more antibiotic resistant bacteria.
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In the presence of plasmid, the additional double stranded circular DNA which provides the extra phenotypic character to bacteria which restricts the antibiotic entry.
EXPLANATION:
These plasmid are genetic structure in DNA which can replicate independently of chromosome. They are mostly present in bacterial and protozoa species. Certain other bacteria like mycoplasma lack peptidoglycan layer but are made of certain sterol in their membrane. In such case these sterol layer are resistant to penicillin and other antibiotics.
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