In biotechnology, sticky ends are select one:
a. dna fragments cleaved by a restriction enzyme so that both strands are the same length.
b. dna fragments that carry a higher charge than normal after they have been cleaved by restriction enzymes.
c. dna fragments cleaved by a restriction enzyme so that one strand is longer than the other.
d. dna fragments that attract a carbohydrate molecule to one end after being cleaved by a restriction enzyme.