Cloning Vectors
Phagemid consist of

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

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Cloning Vectors
Plasmid incompatibility is

None of these
inability of two different plasmids to coexist in the same host cell in the absence of selection pressure.
inability of a plasmid to grow in the host
both (a) and (b)

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Cloning Vectors
Charon vectors are different from EMBL vectors because

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

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Cloning Vectors
Cosmid vectors are

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

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