46.A biologist isolated a gene from a human cell, attached it to a plasmid, and inserted the plasmid into a bacterium. TheI； bacterium made a new protein, but it was nothing like the protein normally produced in a human cell. Why? ;
(A) the bacterium had undergone transformation
(B) the gene did not have sticky ends 誓
(C)the gene contained introns
(D) the gene did not come from a genomic library ;
(E)the biologist should have cloned the gene first ^