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What did the two enzymes isolated in 1963 in Escherichia coli restrict?

Options

  1. AGrowth of bacteriophage
  2. BMethylation of DNA
  3. CCutting of DNA
  4. DBoth A and B

Correct answer

A. Growth of bacteriophage

Step-by-step solution

In the year 1963, the two enzymes responsible for restricting the growth of bacteriophage in Escherichia coli were isolated. One of these added methyl groups to DNA, while the other cut DNA. The later was called restriction endonuclease.

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