Water Potential, Diffusion And Active Transport
17 Questions
| Total Attempts: 375
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A quiz on water potential, diffusion, active transport and other cellular transport. HUMAN BIOLOGY AS LEVEL
Questions and Answers
- 1.Diffusion is the ____ _________ of a substance from a region where it is in ______ concentration to a region where it is in ______ concentration.
- 2.Diffusion is said to be a _______ process.
- 3.What can not diffuse through the phospholipid bilayer?
- A.
Small, lipid-soluble molecules
- B.
Molecules that are soluble in water
- C.
Charged particles such as ions
- 4.Facilitated diffusion is the diffusion of molecules through the plasma membrane with the help of ________. Some of these are protein _______ that are permanently open. They are lined with _____philic amino acids and water. Molecules can also diffuse through the membrane by binding to ______ proteins.
- 5.What kind of process is facilitated diffusion?
- A.
Active
- B.
Passive
- 6.Osmosis is the movement of ______ molecules from a region of _____ water potential to a region of _____ water potential.
- 7.Pure water has the highest possible water potential of ___ .
- 8.Adding solutes to water ______ the water potential, for example it makes the water potential more ______.
- A.
Increases, positive
- B.
Increases, negative
- C.
Decreases, negative
- D.
Decreases, positive
- 9.Osmosis occurs until the water potential is the same on both sides of the membrane. At this point, ___________ has been reached.
- 10.A solution with the same water potential as a cell is said to be _______ with the cell.
- 11.A solution with a lower water potential than the cell is said to be __________.
- 12.A solution with a higher water potential than the cell is said to be _________.
- 13.Glucose and other solutes will dissolve in blood plasma and ______ the water potential but it is mainly the concentration of electrolytes in plasma and in cells that is responsible for maintaining a water potential ________. Electrolytes are ions with a positive or negative _______. Positively charged ions are called _______ and those with a negative charge are called _______.
- 14.Diffusion, osmosis and facilitated diffusion go ______ the concentration gradient.
- A.
Against
- B.
Down
- 15.Active transport is the movement of a substance across a cell membrane ______ its concentration gradient, using energy from ___.
- 16.Exocytosis is...?
- A.
Is when after the the bacterium has been digested, the waste products are released back out of the cell
- B.
Is when the bacterium is engulfed into the cell
- 17.Endocytosis is...?
- A.
Is when after the the bacterium has been digested, the waste products are released back out of the cell
- B.
Is when the bacterium is engulfed into the cell
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