Correct answer: (D) Opine biosynthesis genes are located within the T-DNA segment.
Explanation
The transferred T-DNA carries genes that induce plant hormone and opine synthesis. The bacterium retains virulence machinery outside T-DNA to mediate transfer, and its opine-catabolism genes enable it to use the resulting opines. Hence opine biosynthesis genes lie within T-DNA, D; the other statements reverse the usual locations.
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