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Name: ____________________________________________
Date: _________________________
Diffusion Quiz
Directions: Choose the best answer for each of the following questions and write the corresponding letter on
the line. If the letter is not on the line no credit will be given.
_____ 1. A biologist observed a plant cell in a drop of water as shown in diagram A. The biologist added a 10%
salt solution to the slide and observed the cell as shown in diagram B. The change in appearance of the cell
resulted from
a) more salt moving out of the cell than into the cell
b) more salt moving into the cell than out of the cell
c) more water moving into the cell than out of the cell
d) more water moving out of the cell than into the cell
_____ 2. The calcium concentration in the root cells of certain plants is higher than in the surrounding soil.
Calcium may continue to enter the root cells of the plant by the process of
a) diffusion
c) active transport
b) respiration
d) protein synthesis
_____ 3. The diagram below shows the relative
concentration of molecules inside and outside of a cell.
Which statement 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) Carbon dioxide would diffuse out of the cell.
d) Oxygen would diffuse into the cell.
_____ 4. A substance is most likely to diffuse into a cell when
a) it is a large organic food molecule such as protein or starch
b) it is enclosed in an organelle such as a vacuole
c) the concentration of the substance is greater outside the cell than inside
d) the pH of the substance is greater than the pH of the cell
_____ 5. The process of osmosis would explain the net movement of water into a cell if the percentage of
a) water was 90% inside the cell and 95% outside the cell
b) protein was 30% inside the cell and 35% outside the cell
c) water was 95% inside the cell and 90% outside the cell
d) water and protein was equal inside and outside the cell
_____ 6. Molecule X moves across a cell membrane by diffusion. Which row in the chart below best indicates
the relationship between the relative concentrations of molecule X and the use of ATP for diffusion?
Row Movement of Molecule X
Use of ATP
A
high concentration → low concentration used
B
high concentration → low concentration not used
C
low concentration → high concentration used
D
low concentration → high concentration not used
_____ 7. The diagram below shows molecules represented by X both
outside and inside of a cell. A process that would result in the
movement of these molecules out of the cell requires the use of
a) DNA
b) ATP
c) antigens
d) antibodies
_____ 8. A student prepared four different red blood cell suspensions,
as shown in the chart below. Which suspension would contain red
blood cells that would appear wrinkled and reduced in volume?
a) A
b) B
c) C
d) D
_____ 9. . The diagram below shows two different kinds of substances, A and B, entering a cell.
ATP is most likely being used for
a) substance A to enter the cell
b) substance B to enter the cell
c) both substances to enter the cell
d) neither substance to enter the cell
_____ 10. When most proteins, fats, and carbohydrates are digested
completely, they are converted to end products that
a) are soluble and can easily pass through cell membranes
b) contain long chains of amino acids and fatty acids
c) contain atoms of carbon, hydrogen, oxygen and nitrogen
d) are a direct result of dehydration synthesis
_____ 11. Which statement regarding the functioning of the cell membrane of all organisms is not correct?
a) The cell membrane forms a boundary that separates the cellular contents from the outside environment.
b) The cell membrane is capable of receiving and recognizing chemical signals.
c) The cell membrane forms a barrier that keeps all substances that might harm the cell from entering the
cell.
d) The cell membrane controls the movement of molecules into and out of the cell.
_____ 12. Since cyanide is a poison that limits a cell’s ability to manufacture ATP, a cell containing cyanide is
least likely to carry on the process of
a) passive transport
b) osmosis
c) active transport
d) diffusion
_____ 13. Base your answer to the question on the information and the diagram below and on your
knowledge of biology. The diagram illustrates an investigation carried out in a laboratory activity on diffusion.
The beaker and the artificial cell also contain water.
Which diagram below correctly shows what would happen over time regarding the location of molecules I, G,
and S?
a)
b)
c)
d)
_____ 14. Base your answer to the question on the diagram below and on your knowledge of biology. The
diagram 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.
Which statement best explains the changes shown?
a) Molecular movement was aided by the
presence of specific carbohydrate molecules
on the surface of the membrane.
b) Molecular movement was aided by the
presence of specific enzyme molecules on the
surface of the membrane.
c) Molecules moved across the membrane
without additional energy being supplied.
d) Molecules moved across the membrane only
when additional energy was supplied.
_____ 15. Red blood cells contain a higher concentration of potassium than the surrounding blood plasma
does. This higher concentration is maintained by the process of
a) cyclosis
c) simple diffusion
b) osmosis
d) active transport
_____ 16. In the cell shown below, which lettered structure is responsible for the
excretion of most cellular wastes?
a) A
b) B
c) C
d) D
_____ 17. The diagram below represents the distribution of some molecules inside
and outside of a cell over time.
Which factor prevented the protein molecules from moving out of the cell?
a) temperature
b) pH
c) molecule size
d) molecular concentration
_____ 18. Which substance can enter a cell by diffusion without having to be digested?
a) water
c) starch
b) protein
d) fat
_____ 19. The process of active transport requires the most direct use of
a) carbon dioxide
d) glucose
b) amino acids
c) ATP
_____ 20. A laboratory setup of a model cell is shown in the diagram
below. Which observation would most likely be made 24 hours later?
a) The contents of the model cell have changed color.
b) The diameter of the model cell has increased.
c) The model cell has become smaller.
d) The amount of distilled water in the beaker has increased.