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

stringent plasmids
cryptic plasmids
all of these
relaxed plasmids

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Cloning Vectors
Cosmid vectors are

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

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Cloning Vectors
Charon vectors are different from EMBL vectors because

physical separation of lambda arm from central fragment is required
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 not required

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