Cloning Vectors
Plasmids which are maintained as limited number of copies per cell are known as

relaxed plasmids
stringent plasmids
cryptic plasmids
all of these

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Cloning Vectors
Conjugative plasmids

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

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Cloning Vectors
Cosmids lack

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

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