Benign Vibrio cholerae becomes pathogenic by all of the following steps except
A. a bacteriophage introduces a gene coding for the cholera toxin.
B. the cholera toxin gene is incorporated into the benign Vibrio cholerae chromosome.
C. the benign host is transformed into a disease-causing agent by the toxin.
D. the cholera toxin gene is translated.
E. a bacteriophage binds only to benign Vibrio cholerae without pili.
E. a bacteriophage binds only to benign Vibrio cholerae without pili.
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