Which of the following statements is (are)about restriction enzymes? I. They are used by bacteria to cut up foreign DNA.
II. They cut DNA unevenly to produce "sticky ends."
III. They are non-specific and cut anywhere along a sequence.
IV. They are involved with heterochromatin production.
A)I only
B)IV only
C)I and II
D)I, II, and III
E)III and IV

Question

Quizplus · Accepted Answer

Statement I is true; restriction enzymes are used by bacteria to cut up foreign DNA. Statement II is also true; they cut DNA unevenly to produce "sticky ends." However, statement III is false; restriction enzymes are specific and cut only at certain sequences. Statement IV is also false; restriction enzymes are not involved in heterochromatin production. Therefore, the best choice is C, which includes the true statements about restriction enzymes.

Which of the Following Statements Is (Are)about Restriction Enzymes? I