NEET Biology question

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

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

Answer: (A)

Solution

Methylase does not ligate DNA or cut bacteriophage DNA (that is the role of the restriction enzyme) and it adds, rather than removes, methyl groups, whereas its true

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-125073