Cloning Vectors
Cosmids lack

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

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Cloning Vectors
Plasmid incompatibility is

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
both (a) and (b)

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