Representing and Describing Data · with figure
Identical cells were placed in four sucrose solutions. Which solution would be expected to have the greatest tendency to draw water out of the cells? Use Figure 1 to answer the question.
- ASolution D, because it has the highest solute concentrationcorrect
- BSolution A, because it has the lowest solute concentration
- CSolution B, because it is closest to pure water
- DSolution C, because it contains no solute gradient
Why A is correct
The highest external solute concentration is most hypertonic relative to the cells and has the greatest tendency to draw water out by osmosis.
The evidence in the prompt matters before the topic label: "Identical cells were placed in four sucrose solutions. Which solution would be expected to have the greatest...". The supported answer is "Solution D, because it has the highest solute concentration" because The highest external solute concentration is most hypertonic relative to the cells and has the greatest tendency to draw water out by osmosis. Distractors such as Solution A, because it has the lowest solute concentration or Solution B, because it is closest to pure water either ignore the stated pattern or name a related concept without matching the evidence.
Representing and Describing Data · with figure
Dialysis bags containing 0.2 M sucrose were placed in beakers with different sucrose concentrations. Which beaker was most hypotonic relative to the bag contents? Use Figure 1 to answer the question.
- ABeaker B, because the bag gained some mass.
- BThe lowest external sucrose concentration produced the greatest water gaincorrect
- CBeaker D, because water left the bag.
- DBeaker C, because there was no net mass change.
Why B is correct
A hypotonic external solution has lower solute concentration than the bag and drives water into the bag. Beaker A caused the greatest mass gain.
The evidence in the prompt matters before the topic label: "Dialysis bags containing 0.2 M sucrose were placed in beakers with different sucrose concentrations. Which beaker...". The supported answer is "Beaker A, because the lowest external solute concentration caused the greatest..." because A hypotonic external solution has lower solute concentration than the bag and drives water into the bag. Distractors such as Beaker B, because the bag gained some mass or Beaker D, because water left the bag either ignore the stated pattern or name a related concept without matching the evidence.
Representing and Describing Data · with figure
Potato cores were placed in sucrose solutions for 30 minutes. Figure 1 shows the average percent change in mass. Which conclusion is best supported by the data?
- AThe potato cells are hypertonic to every solution tested.
- BWater moved into the potato cells most rapidly in 0.6 M sucrose.
- CThe potato cells are isotonic to 0.0 M sucrose.
- DThe isotonic concentration is likely between 0.2 M and 0.4 M sucrose.correct
Why D is correct
The mass change shifts from positive at 0.2 M to negative at 0.4 M. The isotonic point, where percent mass change is approximately 0, is therefore between those concentrations.
The evidence in the prompt matters before the topic label: "Potato cores were placed in sucrose solutions for 30 minutes. Figure 1 shows the average percent change in mass....". The supported answer is "isotonic concentration is likely between 0.2 M and 0.4 M sucrose" because The isotonic point, where percent mass change is approximately 0, is therefore between those concentrations. Distractors such as potato cells are hypertonic to every solution tested or Water moved into the potato cells most rapidly in 0.6 M sucrose either ignore the stated pattern or name a related concept without matching the evidence.