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Bacteria use restriction enzymes to cut DNA molecules, usually as a defense against viruses. Restriction enzymes are sequence specific and will only cut at that specific sequence.

EcoRI is a restriction enzyme commonly use in laboratories. It will cut only at the specific sequence 5' GAATTC.

Roughly on average, which frequency across the genome would ​you expect EcoRI to cut a large DNA molecule?


Every 64 base pairs.


Every 500 base pairs.


Every 4,000 base pairs.


Every 16,000 base pairs

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