Discussion
The plasmid-mediated properties is/are
Answer: D
Correct answer: all of these
All three properties can be carried on plasmids rather than on the bacterial chromosome. Lactose fermentation is encoded by lac plasmids in some enteric bacteria, enterotoxin production by Ent plasmids in enterotoxigenic Escherichia coli, and antibiotic resistance by R plasmids, which often carry several resistance determinants together.
This is the general point about plasmids: they are dispensable replicons carrying accessory functions that are useful in particular environments but not required for growth. Because they can be transferred between cells, traits such as toxin production and drug resistance can spread horizontally through a population far faster than mutation alone would allow.
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