Cloning Vectors
Plasmids which are maintained as multiple copy number per cell are known as

none of these
cryptic plasmids
relaxed plasmids
stringent plasmids

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Cloning Vectors
Cosmid vectors are

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

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Cloning Vectors
Conjugative plasmids

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

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