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  4. Bacteria protect themselves from viruses by fragmenting viral DNA with

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Q. Bacteria protect themselves from viruses by fragmenting viral DNA with

NTA AbhyasNTA Abhyas 2022

Solution:

In 1963 two enzymes responsible for restricting the growth of Bacteriophage in E. coli were isolated. One of these added methyl groups to bacterial DNA, while other cut viral DNA. The enzyme which cuts the DNA was later named as restriction endonuclease.