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
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