A key difference between transforming plant cells and human cells is
A. DNA cannot be introduced into human cells.
B. Agrobacterium is commonly used as a tool to directly transform plant cells but not human cells.
C. a vector is needed to introduce DNA into human cells and not plant cells.
D. genes to be expressed in human cells require a eukaryotic promoter, and genes to be expressed in plants don't.
Answer: B
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