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

stringent plasmids
none of these
cryptic plasmids
relaxed plasmids

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Cloning Vectors
Charon vectors are different from EMBL vectors because

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

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