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

all of these
relaxed plasmids
cryptic plasmids
stringent 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
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.

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