Cloning Vectors – Section 1


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26. Cryptic plasmids

A. do not exhibit any phenotypic trait
B. exhibit many phenotypic traits
C. exhibit one phenotypic traits
D. exhibit antibiotic resistance

Correct Answer: A. do not exhibit any phenotypic trait
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27. Phagemid consist of

A. plasmid vector carrying λ phage’s cos site
B. plasmid vector carrying λ attachment (λ att) site
C. plasmid vector carrying origin of replication of λ phage only
D. plasmid vector carrying origin of replication of plasmid only

Correct Answer: B. plasmid vector carrying λ attachment (λ att) site
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28. Maximum size of foreign DNA that can be inserted into an insertion vector is

A. 35 kb
B. 18 kb
C. 50 kb
D. 27 kb

Correct Answer: B. 18 kb
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29. Plasmids which are maintained as multiple copy number per cell are known as

A. stringent plasmids
B. relaxed plasmids
C. cryptic plasmids
D. none of these

Correct Answer: B. relaxed plasmids
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30. Cosmid vectors are

A. plasmids that contain fragment of λ DNA including the cos site
B. phages that lack cos site
C. plasmids that have no selection marker
D. cryptic plasmids

Correct Answer: A. plasmids that contain fragment of λ DNA including the cos site
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