Cloning Vectors
Plasmids which are maintained as multiple copy number per cell are known as

cryptic plasmids
relaxed plasmids
none of these
stringent plasmids

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Cloning Vectors
Phagemid consist of

plasmid vector carrying λ attachment (λ att) site
plasmid vector carrying origin of replication of plasmid only
plasmid vector carrying λ phage's cos site
plasmid vector carrying origin of replication of λ phage only

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Cloning Vectors
Cosmid vectors are

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

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