Plasmids Are Used as Vectors in Both Plant and Bacterial

question 19

Multiple Choice

Plasmids are used as vectors in both plant and bacterial genetic engineering.However,there is a major difference in the fate of genes introduced into bacteria on most bacterial plasmids and into plants on Ti plasmids.What is this difference?

• A)In bacteria,genes are stably expressed;in plants,gene expression is always lost quickly.
• B)Gene expression tends to decrease rapidly and unpredictably in bacteria;gene expression is much more stable in plants.
• C)Bacterial plasmids are circular DNAs;Ti plasmid DNA is linear.
• D)Bacterial plasmids and the genes they carry usually are not integrated into the chromosome;Ti plasmids and the genes they carry are integrated into the chromosome.
• E)Bacterial plasmids typically do not modify the growth of the host cells;Ti plasmids modified for genetic engineering always produce plant galls.

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