Which of the following statements is (are)correct 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.

Question

Quizplus · Accepted Answer

Statement I is correct as restriction enzymes are used by bacteria as a defense mechanism to cut up foreign DNA.
Statement II is correct as restriction enzymes cut DNA at specific recognition sites, often leaving "sticky ends" which can match up with complementary "sticky ends" on other DNA fragments.
Statement III is incorrect as restriction enzymes are specific and cut only at particular recognition sites. 
Statement IV is incorrect as restriction enzymes are not involved in heterochromatin production.

Which of the Following Statements Is (Are)correct About Restriction Enzymes