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

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

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Cloning Vectors
Cosmid vectors are

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

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