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Diffusion And Active Transport
Test Description: Use your knowledge of Living Environment to answer all questions in the data set. You may need a calculator to answer some of the questions. Good Luck.
Instructions: Answer all questions to get your test result.
1) Damage to which structure will most directly disrupt water balance within a single-celled organism?
A
nucleus
B
chloroplast
C
cell membrane
D
ribosome
Helpful Hint
The graph below shows the relative concentrations of different ions inside and outside of an animal cell.
2) Which process is directly responsible for the net movement of K+ and Mg++ into the animal cell?
A
active transport
B
diffusion
C
electrophoresis
D
circulation
3) Which row in the chart below best describes the active transport of molecule X through a cell membrane?
A
2
B
1
C
4
D
3
Helpful Hint
The diagram below shows the relative concentration of molecules inside and outside of a cell.
4) Which of the following statements best describes the general direction of diffusion across the membrane of this cell?
A
Glucose would diffuse into the cell.
B
Protein would diffuse out of the cell.
C
Oxygen would diffuse into the cell.
D
Carbon dioxide would diffuse out of the cell.
Helpful Hint
Molecule X moves across a cell membrane by diffusion.
5) Which row in the chart above best indicates the relationship between the relative concentrations of molecule X and the use of ATP for diffusion?
A
2
B
1
C
4
D
3
6) In the Diffusion Through a Membrane lab, the model cell membranes allowed certain substances to pass through based on which characteristic of the diffusing substance?
A
shape
B
color
C
temperature
D
size
Helpful Hint
A student fills a dialysis membrane bag with a mixture of red dye, yellow dye, and water. He soaks the bag in pure water for 24 hours and then observes that the water outside the bag turns yellow.
7) Which statement best explains the results of this experiment?
A
The yellow dye molecules are smaller than the red dye molecules.
B
Only red dye diffused through the membrane.
C
The dialysis membrane actively transported yellow dye molecules.
D
Water diffused into the membrane bag.
Helpful Hint
The diagram below represents a laboratory setup used by a student during an investigation of diffusion.
8) Which statement best explains why the liquid in tube A will rise over a period of time?
A
Water and starch volumes are the same in both tubes A and B.
B
The water will pass from a region of lower starch concentration to one of higher starch concentration.
C
The starch concentrations are equal on both sides of the membrane.
D
The fluids in both tubes A and B will change from a higher temperature to a lower temperature.
Helpful Hint
Phenolphthalein is a chemical that turns pink in the presence of a base. A student set up the demonstration shown in the diagram below.
9) The appearance of the pink color was due to the movement of
A
water molecules through the membrane from high concentration to low concentration
B
base molecules from high concentration through the membrane to low concentration
C
phenolphthalein molecules from low concentration to high concentration
D
phenolphthalein molecules in the water from high concentration to low concentration
Helpful Hint
A red onion cell has undergone a change, as represented in the diagram below.
10) This change is most likely due to the cell being placed in
A
salt water
B
light
C
distilled water
D
darkness
Helpful Hint
The diagram below represents a plant cell in tap water as seen with a compound light microscope.
11) Which diagram best represents the appearance of the cell after it has been placed in a 15% salt solution for two minutes?
A
3
B
1
C
4
D
2
12) If frog eggs taken from a freshwater pond are placed in a saltwater aquarium, what will most likely happen?
A
Water will leave the eggs.
B
The eggs will burst.
C
Water will neither enter nor leave the eggs.
D
Salt will leave the eggs.
Helpful Hint
The diagram below shows the changes that occurred in a beaker after 30 minutes. The beaker contained water, food coloring, and a bag made from dialysis tubing membrane.
13) When the colors yellow and blue are combined, they produce a green color. Which of the following statements most likely describes the relative sizes of the yellow and blue food-coloring molecules in the diagram?
A
Both the yellow food-coloring molecules and the blue food-coloring molecules are large.
B
The yellow food-coloring molecules are small, while the blue food-coloring molecules are large.
C
The yellow food-coloring molecules are large, while the blue food-coloring molecules are small.
D
Both the yellow food-coloring molecules and the blue food-coloring molecules are small.
Helpful Hint
The diagram below shows the changes that occurred in a beaker after 30 minutes. The beaker contained water, food coloring, and a bag made from dialysis tubing membrane.
14) Which of the following statements best explains the changes shown in the diagram?
A
Molecular movement was aided by the presence of specific enzyme molecules on the surface of the membrane.
B
Molecules moved across the membrane only when additional energy was supplied.
C
Molecular movement was aided by the presence of specific carbohydrate molecules on the surface of the membrane.
D
Molecules moved across the membrane without additional energy being supplied.
*select an answer for all questions
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