Science 35 Minutes

Based on Table 1, as streptomycin concentration increased, the relative fitness of Strain Y:

• increased only.

• decreased only.

• increased and then decreased.

• decreased and then increased.

Tags

NGSS.HS-LS4-4

NGSS.HS-LS4-5

Based on Table 1, if Strain X had been exposed for 24 hr to a streptomycin concentration of 3.0 μg/mL, its relative fitness would most likely have been:

• less than 0.5

• between 0.5 and 0.8

• between 0.8 and 0.9

• greater than 0.9

Tags

NGSS.HS-LS4-4

According to Table 2, which of the following statements best describes the effect of the cation(s) in increasing the observed i value at 25°C?

• Mg2+ increases the observed i value more than Na+ or K+.

• Na+ has no effect on the observed i value.

• K+ decreases the observed i value.

• All cations have the same effect on the observed i value.

Tags

NGSS.HS-PS1-3

Which of the following statements best describes the effect of the mutation in Strain X cells? Compared to nonmutated E. coli cells, Strain X cells remove streptomycin:

• into the cell at a decreased rate.

• into the cell at an increased rate.

• out of the cell at a decreased rate.

• out of the cell at an increased rate.

Suppose an equal number of Strain W cells and Strain X cells were exposed for 24 hr to a streptomycin concentration of 2 μg/mL. Based on Table 1, which of Strain W or Strain X would more likely have the greater number of cells survive and reproduce?

• Strain W; Strain W had a relative fitness of 0.3, and Strain X had a relative fitness of 0.6.

• Strain W; Strain W had a relative fitness of 1.2, and Strain X had a relative fitness of 0.9.

• Strain X; Strain X had a relative fitness of 0.8, and Strain W had a relative fitness of 0.3.

• Strain X; Strain X had a relative fitness of 0.9, and Strain W had a relative fitness of 1.2.

Tags

NGSS.HS-LS4-4

NGSS.HS-LS4-5

NGSS.HS-LS4-3

Consider the mutated strain with an increased rate of cell division. According to Table 1, what was the relative fitness of this strain when it was exposed for 24 hr to a streptomycin concentration of 4 μg/mL?

• 0.1

• 0.2

• 0.5

• 0.7

Tags

NGSS.HS-LS4-4

NGSS.HS-LS4-5

In the study, the relative fitness of a nonmutated strain that was grown for 24 hr in the absence of any antibiotic was set to 1.0. Was this strain more likely Strain U or Strain Z, and was this strain grown for 24 hr at a streptomycin concentration of 0 μg/mL or at a streptomycin concentration of 8 μg/mL?

• Strain U; 0 μg/mL

• Strain U; 8 μg/mL

• Strain Z; 0 μg/mL

• Strain Z; 8 μg/mL

Tags

NGSS.HS-LS4-4

NGSS.HS-LS4-5

How many times in Experiment 2 was a bottle placed into the box when the box was maintained at 10°C?

• 7

• 14

• 29

• 58

Tags

NGSS.HS-PS3-4

Suppose that in Experiment 2 the bottle containing water stored at 50°C had been reused 35 times. At that reuse number, the approximate concentration of Sb5+ in the water would have been:

• less than 270 ng/L

• between 270 ng/L and 300 ng/L

• between 300 ng/L and 330 ng/L

• greater than 330 ng/L

Tags

NGSS.HS-PS1-5

Assume that the maximum acceptable concentration of Sb5+ in drinking water is 6,000 ng/L. This concentration of Sb5+ is how many times as great as the concentration of Sb5+ ion water stored at 50°C in a bottle that was reused 21 times in Experiment 2?

• 2

• 3

• 20

• 30