The ames test is used to identify potential carcinogens. a compound tested resulted in a few scattered colonies growing on the media, similar to the control plate with no disk. what does this result imply? a. the compound in the disk is so toxic that it inhibits almost all growth on the plate. b. the few colonies that grew are resistant to the compound. c. the few colonies that grew contain reversion mutations that allow them to grow on media without histidine. d. the compound in the disk is not mutagenic so there was no increase in the reversion rate.
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