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

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

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Cloning Vectors
Phagemid consist of

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

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Cloning Vectors
Charon vectors are different from EMBL vectors because

both (a) and (b)
they have more extensive range of restriction targets with in their polylinkers.
physical separation of lambda arm from central fragment is required
physical separation of lambda arm from central fragment is not required

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