A) \[Ti\]
B) \[Cpl\text{ }E\]
C) \[{{\text{R}}_{\text{100}}}\]
D) \[pB{{r}^{322}}\]
Correct Answer: B
Solution :
Col-plasmids carry genes that confer ability to the host bacterium to kill other bacteria by secreting bacteriocins. a type of proteins. Bacteriocins often kill cells by creating channels in the plasmamembrane thus, increasing its permeability. They also may degrade DNA or RNA or attack peptidoglycan and weaken the cell wall. Bacteriocins act only against closely related strains. Col E plasmid of E. coli code for the synthesis of bacteriocin called colicins which kill other susceptible strains of E. coli. Col-plasmids of some E. coli code for the synthesis of bacteriocin, namely cloacins that kill enter obacter species. Lactic acid bacteria produce bacteriocin Nis in A which strongly inhibits the growth of a wide veriety of Gram(+) bacteria and is used as a preservative in the food industry.
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