Cloning Vectors
A plasmid can be considered as a suitable cloning vector if

insertion of foreign DNA does not alter its replication properties
it can be readily isolated from the cells
All of these
it possesses a single restriction site for one or more restriction enzymes

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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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