The plasmids that cause R plasmids most likely acquired are bacterial conjugation by the bacterial infection. Such plasmids, termed drug-resistance (R) factors, typically additionally specify the formation of intercourse pili, filamentous appendages at the surface.
These sell bacterial conjugation, and therefore allow the switch of a duplicate of the plasmid from the resistant organism to one that may also formerly had been drug-sensitive. Antibiotic resistance genes harbored in plasmids may be without problems transferred to commensal and pathogenic micro organism via a technique called bacterial conjugation.
Through a technique referred to as conjugation, the conjugation pilus allows the bacterium to switch a duplicate of the R-plasmids to different micro organism, making them additionally more than one antibiotic resistant and capable of produce a conjugation pilus.
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Because of their relatively simple genetic structure when compared to other organisms. Not to mention, they breed in extremely high numbers which is great for scientists looking to do many trials, as most are. Their life cycle is also very short which means we can observe their entire life span and witness the effects of testing at all stages.
The characteristics of agar that makes it a useful solidifying agent for growth media is it is unable to be metabolized by most microorganisms. Agar is a common solidifying agent for a culture medium; a complex polysaccharide derived from a marine alga - long been used as a thickener in foods such as jellies and ice cream. Agar has some very important properties that make it valuable to microbiology, and no satisfactory substitute has ever been found. A small number of microorganisms can damage agar so it remains solid. Also, agar liquefies at about 100°C which is the boiling point of water and at sea level remains liquid until the temperature drops to about 40°C. For laboratory use, agar is held in water baths at about 50°C. At this temperature, it does not injure most bacteria when it is poured over them. As soon as the agar has hardened it can be keep warm at high temperature approaching 100°C before it again dissolves and is particularly valuable when thermophilic bacteria are grownup.