Cloning Vectors
Cosmids lack

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

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Cloning Vectors
Cosmid vectors are

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

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Cloning Vectors
Conjugative plasmids

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

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