What Are the ʺSticky Endsʺ Produced by Some Restriction Enzymes

Multiple Choice

What are the ʺsticky endsʺ produced by some restriction enzymes?

A) Sticky ends are DNA strands with an extra hydroxyl group on the end.
B) Sticky ends are able to hydrogen bond with complementary strands.
C) Sticky ends are short single-strand ends of a DNA molecule.
D) Sticky ends are short single-strand ends of DNA able to hydrogen bond with complementary strands.
E) Sticky ends are DNA strands able to form phosphate bonds with free DNA ends.