Question

How is the name given to restriction endonucleases?

Hint:

EcoRI is one of the most widely used restriction enzymes in genetic engineering.

Answer 1

Step 1: Basis of naming.
Restriction endonucleases are named according to the bacterium from which they are isolated.
Step 2: Rules.
1. The first letter → genus (capital).
2. Next two letters → species (small letters).
3. Strain of bacterium may be mentioned.
4. Roman numeral indicates the order of discovery.
Step 3: Example.
EcoRI:
- E → Escherichia (genus)
- co → coli (species)
- R → strain RY13
- I → First enzyme isolated from this strain.
Step 4: Conclusion.
Thus, restriction enzymes are named scientifically using genus, species, strain, and discovery order.