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
Charon vectors are different from EMBL vectors because

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

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