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

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

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Cloning Vectors
Phagemid consist of

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

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Cloning Vectors
Cosmids lack

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

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