Cloning Vectors
Cosmid vectors are

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

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Cloning Vectors
Conjugative plasmids

do not exhibit antibiotic resistance
exhibit antibiotic resistance
carry transfer genes called the tra genes
do not carry transfer genes

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Cloning Vectors
Cosmids lack

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

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