Cloning Vectors
Cosmid vectors are

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

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Cloning Vectors
Plasmid incompatibility is

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

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