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

none of these
relaxed plasmids
stringent plasmids
cryptic plasmids

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Cloning Vectors
Cosmid vectors are

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

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Cloning Vectors
Charon vectors are different from EMBL vectors because

they have more extensive range of restriction targets with in their polylinkers.
both (a) and (b)
physical separation of lambda arm from central fragment is required
physical separation of lambda arm from central fragment is not required

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