Question

Which statement regarding recombinant DNA is false?

Select one:

a. Restriction enzymes cut DNA at palindromic sequences.

b. A single restriction enzyme can cut DNA sequences at several different recognition sites.

c. Restriction enzymes can create DNA fragments with “blunt ends.”

d. Complementary “sticky ends” can form hydrogen bonds with each other.

e. Restriction enzymes can create DNA fragments with “sticky ends.”

Answer 1

Answer :

Option b -  A single restriction enzyme can cut DNA sequences at several different recognition sites.

A restriction enzyme or a restriction endonuclease identifies specific sequences in a DNA molecule. It can form sticky or blunt ends. The sticky ends are able to form hydrogen bonds with each other. These enzymes cut at palindromic sequences.

A single restriction enzyme can cut DNA at just one or very few (not several ) different recognition sites.