Cloning Vectors
Cosmid vectors are

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

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Cloning Vectors
Plasmid incompatibility is

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.
None of these

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