Cloning Vectors
Plasmids which are maintained as limited number of copies per cell are known as

cryptic plasmids
relaxed plasmids
all of these
stringent plasmids

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Cloning Vectors
Cosmid vectors are

cryptic plasmids
phages that lack cos site
plasmids that have no selection marker
plasmids that contain fragment of λ DNA including the cos site

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Cloning Vectors
Cosmids lack

cleavage site for the insertion of foreign DNA
marker genes coding for replication
genes coding for viral proteins
origin of replication

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