Cloning Vectors
Cosmid vectors are

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

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Cloning Vectors
Plasmid incompatibility is

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

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