11. Which of the following is not commonly used as vector?

A. Artificial chromosome
B. Cosmid
C. Fungi
D. Plasmid

12. A short molecule containing 2-20 nucleotide is

A. plasmid
B. vector
C. oligonucleotide
D. mononucleotide

13. Enzymes that recognize and cleave specific 4 to 8 base pair sequences of DNA are

A. DNA ligase
B. helicases
C. restriction endonucleases
D. DNA gyrase

14. Which of the following vector can maintain the largest fragment of foreign DNA?

A. YAC
B. Cosmid
C. Plasmid
D. Phage

15. Charged molecules are separated based on varying rates of migration through a solid matrix when subjected to an electric field. This technique is known as

A. photoreactivation
B. gel electrophoresis
C. autoradiography
D. blotting