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hichkok12 [17]
3 years ago
10

How was the appearance of the disease-causing bacteria (S strain) different from the harmless bacteria (R Strain)?

Biology
1 answer:
Vlad [161]3 years ago
3 0
The disease-causing bacteria (S strain) grew into smooth colonies on culture plates, whereas the harmless bacteria (R strain) produced colonies with rough edges. The difference in appearance made the two strains easy to tell apart. ... When he injected mice with harmless bacteria, the mice stayed healthy.
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