Discussion
Which of the enzymes are used to cut the recipient DNA?
Answer: A
Correct answer: endonuclease
An endonuclease cuts within the DNA strand, which is what is needed to open the recipient chromosome so that donor material can be inserted. An exonuclease trims from the ends, ligases join, and polymerases synthesise - the four together being the toolkit for recombination and for genetic engineering.
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