Cloning Vectors
Cosmid vectors are

cryptic plasmids
phages that lack cos site
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
None of these
inability of two different plasmids to coexist in the same host cell in the absence of selection pressure.
both (a) and (b)

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Cloning Vectors
Conjugative plasmids

do not carry transfer genes
carry transfer genes called the tra genes
do not exhibit antibiotic resistance
exhibit antibiotic resistance

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