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

 2. 
A cell moves particles from a region of lesser concentration to a region of greater concentration by _____.
a.
osmosis
c.
facilitated diffusion
b.
passive transport
d.
active transport
 

 3. 
A plasma membrane is most fluid if it contains _____.
a.
unsaturated fatty acids
c.
proteins
b.
saturated fatty acids
d.
cholesterol
 

 4. 
The structure most responsible for maintaining cell homeostasis is the _____.
a.
cell wall
c.
plasma membrane
b.
cytoplasm
d.
mitochondrion
 

 5. 
Because the phospholipid molecules and some proteins are free to move, the plasma membrane is said to be a _____.
a.
solid
c.
fluid mosaic
b.
fatty acid
d.
bilayer
 

 6. 
When some molecules go through a membrane faster than others, the membrane is _____.
a.
impermeable
c.
defective
b.
permeable
d.
selectively permeable
 

 7. 
Diffusion continues until there is no _____.
a.
concentration gradient
c.
dynamic equilibrium
b.
turgor pressure
d.
homeostasis
 

 8. 
Which of the following might be a result of a disease that causes a thickened plasma membrane?
a.
decreased movement of molecules within the cell
b.
increased movement of molecules leaving the cell
c.
increased movement of molecules entering the cell
d.
decreased movement of molecules entering the cell
 

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

 10. 
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
 



 
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