Cloning Vectors
A plasmid can be considered as a suitable cloning vector if

insertion of foreign DNA does not alter its replication properties
it can be readily isolated from the cells
All of these
it possesses a single restriction site for one or more restriction enzymes

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Cloning Vectors
Phagemid consist of

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

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