Cloning Vectors
Plasmid incompatibility is

None of these
inability of a plasmid to grow in the host
both (a) and (b)
inability of two different plasmids to coexist in the same host cell in the absence of selection pressure.

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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.
physical separation of lambda arm from central fragment is required
both (a) and (b)
physical separation of lambda arm from central fragment is not required

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