Cloning Vectors
Plasmids which are maintained as limited number of copies per cell are known as

all of these
stringent plasmids
cryptic plasmids
relaxed plasmids

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Cloning Vectors
Cosmid vectors are

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

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Cloning Vectors
Plasmid incompatibility is

None of these
both (a) and (b)
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

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