Question: In an Ames test, a ____________ number of colonies is observed if a substance ________ a mutagen, compared with the number of colonies for a

In an Ames test, a ____________ number of colonies is observed if a substance ________ a mutagen, compared with the number of colonies for a control sample that is not exposed to the suspected mutagen.

a. significantly higher, is

b. significantly higher, is not

c. significantly lower, is

d. significantly lower, is not

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