In the Ames test, mutagenicity is normally tested on a strain of bacterium (Salmonella typhimurium) that cannot synthesize the amino acid histidine. Therefore, these bacteria require histidine in the growth plate to survive. A researcher performs the Ames test to evaluate the mutagenicity of a newly synthesized compound and notices that Salmonella typhimurium is living on a histidine-free growth plate. What can be concluded from these results?
A. The bacteria produce histidine.
B. The newly synthesized compound induces a mutation in the bacteria and the bacteria no longer produce histidine.
C. The newly synthesized compound induces a mutation in the bacteria and the bacteria produce histidine.
D. The bacteria no longer produce histidine.
E. The newly synthesized compound induces a mutation in the bacteria.
Answer: C
You might also like to view...
What do echinoderms and chordates have in common?
A. endoskeletons B. dorsal nerve cords C. protostome development D. ecdysis
The species concept based on careful analysis of the anatomical details of the specimen in question is ________
A) the morphospecies concept B) the phylogenetic species concept C) the biological species concept D) the ecological species concept
What is the best term describing a sudden spike of new cases of 'meningitis' disease among a group of Aggies?
A. Enzootic B. Epidemic C. Zoonosis D. Epizootic E. Endemic
The process in which viral capsids are removed within the infected cell is called (entry/disassembly/uncoating)
What will be an ideal response?