Cloning Vectors
Plasmid incompatibility is

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

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Cloning Vectors
Cosmids lack

marker genes coding for replication
cleavage site for the insertion of foreign DNA
origin of replication
genes coding for viral proteins

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