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InterviewSolution
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Assertion : A bacterial cell with restriction enzymes will be easily infected and lysed by bacteriophages. Reason : Restriction enzymes catalyse synthesis of protective coat around bacterial cell that prevents bacteriophage attack. |
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Answer» Correct Answer - C Restriction enzymes were named due to the phenomenon of host restriction of bacterial phages. Restriction enzymes produced in a bacterial cell, recognise and cleave foreign DNA introduced (such as from bacteriophage) into the cell. Thus, bacterial cell cannot beinfected and lysed by bacteriophage and hence a bacterial cell lacking restriction enzymes is easily susceptible to infection of phages. The DNA of the host bacterial cell is protected from its own restriction endonuclease by methylation (usually of A and C) within their reconginition sites. |
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