Cloning Vectors
Cosmid vectors are

plasmids that have no selection marker
plasmids that contain fragment of λ DNA including the cos site
phages that lack cos site
cryptic plasmids

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Cloning Vectors
Cosmids lack

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

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Cloning Vectors
Plasmid incompatibility is

None of these
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)

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