The disarmed Ti plasmid has a selectable marker for KanR and the transformation vector has a selectable marker for AmpR. The markers KanR and AmpR are genes that confer resistance to the antibiotics kanamycin and ampicillin.How are these markers used to identify Agrobacterium tumefaciens bacteria that have acquired both the disarmed Ti plasmid and the transformation vector and are capable of transforming plant cells?
a. Bacteria that have acquired at least one of the plasmids can grow on a culture medium containing both kanamycin and ampicillin.
b. Bacteria that have acquired both plasmids are resistant to both kanamycin and ampicillin and can grow on a culture medium containing both antibiotics.
c. Bacteria that have acquired at least one of the plasmids can metabolize the antibiotics for energy and grow on a culture medium containing both kanamycin and ampicillin.
d. Bacteria that have acquired both plasmids are resistant to both kanamycin and ampicillin and can grow on a culture containing minimal medium.