All of the Following Statements Are True About Restriction Enzymes

Multiple Choice

All of the following statements are true about restriction enzymes EXCEPT

A) they are made by bacteria and viruses.
B) hundreds of different ones have been isolated and purified.
C) they produce single-stranded complementary ends that can join to two different DNA strands by complementary base-pairing.
D) each enzyme cuts DNA at a different specific base sequence.