Cloning Vectors
Phagemid consist of

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
plasmid vector carrying origin of replication of plasmid only

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Cloning Vectors
Charon vectors are different from EMBL vectors because

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

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Cloning Vectors
Cosmid vectors are

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

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