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

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

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12. A short molecule containing 2-20 nucleotide is

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

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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

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

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

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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

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