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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 most fluid if it contains _____.
a.
saturated fatty acids
c.
unsaturated fatty acids
b.
cholesterol
d.
proteins
 

 2. 
When some molecules go through a membrane faster than others, the membrane is _____.
a.
selectively permeable
c.
defective
b.
impermeable
d.
permeable
 

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

 4. 
A plasma membrane is made up of a(n) _____.
a.
lipid bilayer
c.
protein layer
b.
cholesterol layer
d.
enzyme bilayer
 

 5. 
If a cell is placed in salt water, water leaves the cell by _____.
a.
active transport
c.
phagocytosis
b.
osmosis
d.
diffusion
 

 6. 
Because the phospholipid molecules and some proteins are free to move, the plasma membrane is said to be a _____.
a.
fatty acid
c.
fluid mosaic
b.
solid
d.
bilayer
 

 7. 
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 entering the cell
c.
decreased movement of molecules entering the cell
d.
increased movement of molecules leaving the cell
 

 8. 
A cell moves particles from a region of lesser concentration to a region of greater concentration by _____.
a.
passive transport
c.
osmosis
b.
active transport
d.
facilitated diffusion
 

 9. 
If it is not watered, a tulip plant wilts because it _____.
a.
increases turgor pressure
c.
increases active transport
b.
loses turgor pressure
d.
loses active transport
 

 10. 
Diffusion continues until there is no _____.
a.
turgor pressure
c.
homeostasis
b.
dynamic equilibrium
d.
concentration gradient
 



 
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