Microbial Recombination and Gene Transfer
When composite transposons are formed

an IS element integrates with another IS element with the help of a plasmid
two IS elements integrate into a chromosome with only a small distance separating them
a small deletion occurs in the transposase gene of an IS element and plasmid is integrated
a small deletion occurs in the transposase gene of an IS element

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Microbial Recombination and Gene Transfer
The main difference between a self-transmissible and a mobilizable plasmid is that the self-transmissible plasmid

usually has a transposon inserted into it
transfers antibiotic resistance genes
transfers both strands of the plasmid DNA
carries genes encoding the mating apparatus

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