MHT CET Biology question

Two enzymes responsible for restricting the growth of bacteriophages in E.coli were isolated. One was methylase and other was restriction endonuclease. What is the significance of methylase?

(A)Protection of host DNA from the action of restriction endonuclease, by adding methyl group to one or two bases usually with in the sequence recognized by restriction enzymeCorrect
(B)Able to ligate the two cohesive ends of DNA molecule
(C)Able to removes the methyl group and hence, prevent the action of restriction endonuclease on host DNA
(D)Able to cuts the DNA of bacteriophage at specific sites

Answer: (A)

Solution

Methylase adds methyl groups within the recognition sequence of the host DNA so that the host's own restriction endonuclease cannot cut it; ligating

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Question ID VK-080248