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Bio4B:  Cellular processes (Chapter 9)

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 
When some molecules go through a membrane faster than others, the membrane is _____.
a.
impermeable
c.
selectively permeable
b.
permeable
d.
defective
 

 2. 
A plasma membrane is made up of a(n) _____.
a.
enzyme bilayer
c.
cholesterol layer
b.
lipid bilayer
d.
protein layer
 

 3. 
The structure most responsible for maintaining cell homeostasis is the _____.
a.
plasma membrane
c.
mitochondrion
b.
cell wall
d.
cytoplasm
 

 4. 
If it is not watered, a tulip plant wilts because it _____.
a.
loses active transport
c.
loses turgor pressure
b.
increases turgor pressure
d.
increases active transport
 

 5. 
Which of the following might be a result of a disease that causes a thickened plasma membrane?
a.
decreased movement of molecules entering the cell
b.
decreased movement of molecules within the cell
c.
increased movement of molecules entering the cell
d.
increased movement of molecules leaving the cell
 

 6. 
Diffusion continues until there is no _____.
a.
homeostasis
c.
turgor pressure
b.
dynamic equilibrium
d.
concentration gradient
 

 7. 
Because the phospholipid molecules and some proteins are free to move, the plasma membrane is said to be a _____.
a.
fatty acid
c.
solid
b.
fluid mosaic
d.
bilayer
 

 8. 
A plasma membrane is most fluid if it contains _____.
a.
cholesterol
c.
proteins
b.
saturated fatty acids
d.
unsaturated fatty acids
 

 9. 
If a cell is placed in salt water, water leaves the cell by _____.
a.
phagocytosis
c.
diffusion
b.
active transport
d.
osmosis
 

 10. 
A cell moves particles from a region of lesser concentration to a region of greater concentration by _____.
a.
active transport
c.
osmosis
b.
passive transport
d.
facilitated diffusion
 



 
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