Which Is Incorrect About Restriction Enzymes

Multiple Choice

Which is incorrect about restriction enzymes?

A) They are key tools that make genetic engineering possible.
B) They are found in bacteria and eukaryotes.
C) They were discovered by Werner Arber and Hamilton Smith in 1960s.
D) A specific enzyme will always cut at the same sequence.
E) Bacteria may possess them naturally to rid themselves of viral DNA.