Cloning Vectors
Phagemid consist of

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
plasmid vector carrying λ attachment (λ att) site

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Cloning Vectors
Plasmid incompatibility is

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

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