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There is a restriction endonuclease called EcoRI. What does 'co' part in it stand for?

1. colon
2. coelom
3. coenzyme
4. coli

Correct answer: coli

Solution

In restriction enzyme nomenclature, the first part often identifies the source organism. In EcoRI, 'Eco' refers to Escherichia coli, so the 'co' part points to coli.

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