Bоnus Questiоn (up tо 8 points): Agrobаcterium tumefаciens is pаthogenic on plants only if it contains the Ti plasmid. This plasmid contains four critical genes, in addition to those needed just to produce and transport the T-DNA complex into the host. List the functions of the four genes, and for each gene, identify whether it is expressed in the plant or the bacterium.