How many major types of restriction endonucleases have been recognised?

One

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Two

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Three

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Four

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Solution

The correct option is D Four
Answer is option D i.e. "Four"
Restriction endonucleases are a class of enzyme that cut DNA molecules. Four types of restriction enzymes are recognized. These are named as type I, type II, type III, and type IV, which differ in their structure, cleavage site, specificity and co-factors.

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