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Biology 20 Online
OpenStudy (anonymous):

Restriction enzymes are 1. Naturally occurring proteins 2. genetically engineered proteins 3. enzymes that cut proteins 4. b then c 5. a then c

OpenStudy (anonymous):

4

OpenStudy (matt101):

Actually they don't have to be genetically engineered. Many bacteria possess restriction enzymes naturally, possibly to defend against viral infection. 1,2, and 3 are all correct...

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