Microbial Recombination and Gene Transfer
Which of the following statement describes plasmids?

Small, circular DNA molecules that can exist independently of chromosomes commonly found in bacteria
Another name for a protoplast
None of these
A complex membrane structure that covers the chromosome of bacteria

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Microbial Recombination and Gene Transfer
When composite transposons are formed

a small deletion occurs in the transposase gene of an IS element
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
an IS element integrates with another IS element with the help of a plasmid

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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

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

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