sandra
Forum Guru
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R factors:
A. Are small plasmids which encode resistance to only one type of antibiotic
B. Contain plasmid elements (replication origins, incompatibility determinants, etc.) that were widespread in the pre-antibiotic era
C. Represent genetically engineered cloning vectors which have escaped into pathogenic bacteria
D. All of the above are correct
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| DrS
Forum Elite
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A?
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| sandra
Forum Guru
Topics: 200
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i think its none..
source_
R-factor is an old name for a plasmid that codes for antibiotic resistance. Often, R-factors code for more than one antibiotic resistance factor: genes that encode resistance to unrelated antibiotics may be carried on a single R-factor. Many R-factors can pass from one bacterium to another through bacterial conjugation and are a common means by which antibiotic resistance spreads between bacterial species, genera and even families. For example RP1, a plasmid that encodes resistance to ampicillin, tetracycline and kanamycin originated in a species of Pseudomonas, from the Family Pseudomonadaceae, but can also be maintained in bacteria belonging to the family Enterobacteriaceae, such as Escherichia coli.
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