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How many restriction enzymes are known today besides Hind II?

Options

  1. AMore than 900
  2. BMore than 900 restriction enzymes from over 2030 strains of bacteria
  3. COver 2030 strains of bacteria
  4. DSix base pairs

Correct answer

A. More than 900

Step-by-step solution

The first restriction endonuclease–Hind II, whose functioning depended on a specific DNA nucleotide sequence was isolated and characterized five years later. It was found that Hind II always cut DNA molecules at a particular point by recognizing a specific sequence of six base pairs. This specific base sequence is known as the recognition sequence for Hind II. Besides Hind II, today we know more than 900 restriction enzymes that have been isolated from over 230 strains of bacteria each of which recognize different

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