Recombinant DNA Technology
Plant transformation can be obtained by

shooting DNA into plant cells with a gun
combining plant and animal cells in culture
using the E. coli bacterium to infect plant roots
infecting plants with a tobacco mosaic virus

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Recombinant DNA Technology
An expression vector

always contains DNA segments for the regulation of mRNA production
always contains an origin of replication
All of these
usually contains a gene that confers antibiotic resistance to the bacterial host

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