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- 1. Multiple Choice
Based on the results of the study, which of the suspected mutagens resulted in the greatest number of His+ revertants in a dish?
Substance L
Substance M
Substance N
Substance P
- 2. Multiple Choice
Which dish in the study was intended to serve the purpose of testing whether so of the S. typhimurium cells became His+ revertants without the addition of a mutagen?
Dish 1
Dish 2
Dish 3
Dish 4
- 3. Multiple Choice
Based on the results of the study, what is the order of the suspected mutagens, from the substance with the least potential to be mutagenic to the substance with the most potential to be mutagenic?
P, M, N, L
P, L, M, N
N, L, P, M
N, M, L, P
- 4. Multiple Choice
In the study, the scientists tested the effect of Substance P at a concentration of g/ mL. After the study, the scientists repeated their test of the effect of Substance P, but at 3 other concentrations. The 3 concentrations and their corresponding results are shown in the table below.
What is the relationship, if any, between the concentration of Substance P and its potential to cause mutations?As the concentration of Substance P increases, its potential to cause mutations increases only.
As the concentration of Substance P increases, its potential to cause mutations decreases only.
As the concentration of Substance P increases, its potential to cause mutations first decreases and then increases.
There is no relationship between the concentration of Substance P and its potential to cause mutations.
- 5. Multiple Choice
Before bacteria was added to it, the dish that was intended to serve as the control dish in the study lacked which of the substances listed below?
I. Histidine
II. Nutrient agar
III. Suspected mutagen
II only
III only
I and II only
I and III only
- 6. Multiple Choice
Which of the following statements about the numbers of bacteria that regained the ability to synthesize histidine is consistent with the results of the study for Dishes 2 and 3? The number of bacteria that became His+ revertants after the exposure to:
Substance M was about 2 times the number of bacteria that became His+ revertants after exposure to Substance L.
Substance L was about 2 times the number of bacteria that became His+ revertants after exposure to Substance M.
Substance M was about 4 times the number of bacteria that became His+ revertants after exposure to Substance L.
Substance 4 was about 2 times the number of bacteria that became His+ revertants after exposure to Substance M.
- 7. Multiple Choice
The particular strain of S. typhimurium chosen for the study lacks normal DNA repair mechanisms. Which of the following statements gives the most likely reason this particular strain was chosen? The scientists:
did not want the bacteria in the study to synthesize any DNA
did not want the bacteria in the study to synthesize any proteins
wanted the bacteria in the study to be able to repair the mutations caused by the substances
wanted the bacteria in the study to be unable to repair the mutations caused by the substances
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