Diffusion And Active Transport Question Preview (ID: 56895)

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Which of the following statements best explains the changes shown in the diagram?

a) Molecules moved across the membrane only when additional energy was supplied.

b) Molecules moved across the membrane without additional energy being supplied.

c) Molecular movement was aided by the presence of specific carbohydrate molecules on the surface of the membrane.

d) Molecular movement was aided by the presence of specific enzyme molecules on the surface of the membrane.

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) The yellow food-coloring molecules are large, while the blue food-coloring molecules are small.

b) Both the yellow food-coloring molecules and the blue food-coloring molecules are small.

c) The yellow food-coloring molecules are small, while the blue food-coloring molecules are large.

d) Both the yellow food-coloring molecules and the blue food-coloring molecules are large.

If frog eggs taken from a freshwater pond are placed in a saltwater aquarium, what will most likely happen?

a) Salt will leave the eggs.

b) The eggs will burst.

c) Water will neither enter nor leave the eggs.

d) Water will leave the eggs.

Which diagram best represents the appearance of the cell after it has been placed in a 15% salt solution for two minutes?

a) 1

b) 2

c) 3

d) 4

This change is most likely due to the cell being placed in

a) light

b) darkness

c) distilled water

d) salt water

The appearance of the pink color was due to the movement of

a) base molecules from high concentration through the membrane to low concentration

b) phenolphthalein molecules from low concentration to high concentration

c) phenolphthalein molecules in the water from high concentration to low concentration

d) water molecules through the membrane from high concentration to low concentration

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 fluids in both tubes A and B will change from a higher temperature to a lower temperature.

c) The starch concentrations are equal on both sides of the membrane.

d) The water will pass from a region of lower starch concentration to one of higher starch concentration.

Which statement best explains the results of this experiment?

a) The yellow dye molecules are smaller than the red dye molecules.

b) Water diffused into the membrane bag.

c) Only red dye diffused through the membrane.

d) The dialysis membrane actively transported yellow dye molecules.

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) Oxygen would diffuse into the cell.

c) Carbon dioxide would diffuse out of the cell.

d) Protein would diffuse out of the cell.

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) 1

b) 2

c) 3

d) 4

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) color

b) size

c) temperature

d) shape

Damage to which structure will most directly disrupt water balance within a single-celled organism?

a) nucleus

b) chloroplast

c) ribosome

d) cell membrane

Which process is directly responsible for the net movement of K+ and Mg++ into the animal cell?

a) diffusion

b) active transport

c) electrophoresis

d) circulation

Which row in the chart below best describes the active transport of molecule X through a cell membrane?

a) 1

b) 2

c) 3

d) 4

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