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 possesses a single restriction site for one or more restriction enzymes
it can be readily isolated from the cells

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Cloning Vectors
Plasmid incompatibility is

None of these
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.
both (a) and (b)

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