After seven days, the scientist repeats the experiment in a Petri dish that contains an antibiotic drug.

Question

 
Which statement ,begin emphasis,most,end emphasis, likely predicts the results of this second experiment?
Answer options with 4 options
A.
The number of bacteria that have trait A will decrease over time over all seven days.
B.
The number of colonies of trait B bacteria will be the same as it was in the first experiment.
C.
There will be more colonies of bacteria with trait B on Day 7 than colonies of trait A bacteria.
D.
The number of colonies of trait A bacteria on Day 5 will be greater than the number of colonies of trait B bacteria on Day 5. 

Answer 1

To predict the likely results of the second experiment involving an antibiotic drug, we need to consider how bacteria might respond to such an environment.

• Statement A suggests that the number of bacteria with trait A will decrease over time. This could happen if trait A bacteria are susceptible to the antibiotic, resulting in their reduction.
• Statement B claims that the number of colonies of trait B bacteria will remain the same as in the first experiment. This does not account for the possible impact of the antibiotic.
• Statement C posits that there will be more colonies of trait B bacteria on Day 7 than of trait A bacteria. This could occur if trait B bacteria are resistant to the antibiotic.
• Statement D states that on Day 5, the number of colonies of trait A bacteria will be greater than those of trait B bacteria. This might happen initially, but if trait B were resistant to the antibiotic, on Day 7, this may not hold true anymore.

Given these considerations, the most likely outcome—assuming trait B bacteria are resistant to the antibiotic—is:

C. There will be more colonies of bacteria with trait B on Day 7 than colonies of trait A bacteria.