Fred Griffith's experiment, in which he used two strains of Streptococcus pneumoniae, demonstrated that _____
a. pathogenic bacteria function differently in mice than in other organisms
b. harmless bacteria can become transformed into disease-causing bacteria by a bacteria transformation factor
c. pure DNA extracted from disease-causing bacteria transformed harmless strains into killer strains
d. dead cells lose their genetic information
e. DNA is a protein rich in nitrogen and phosphorus
ANSWER: b
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