Cloning Vectors
A plasmid can be considered as a suitable cloning vector if

insertion of foreign DNA does not alter its replication properties
All of these
it can be readily isolated from the cells
it possesses a single restriction site for one or more restriction enzymes

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Cloning Vectors
Plasmid incompatibility is

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

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