Water Potential, Diffusion And Active Transport

17 Questions | By Nuzzzzie | Last updated: Mar 19, 2022 | Total Attempts: 635

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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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