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

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

 3. 
Diffusion continues until there is no _____.
a.
concentration gradient
c.
turgor pressure
b.
dynamic equilibrium
d.
homeostasis
 

 4. 
A plasma membrane is most fluid if it contains _____.
a.
unsaturated fatty acids
c.
saturated fatty acids
b.
cholesterol
d.
proteins
 

 5. 
A cell moves particles from a region of lesser concentration to a region of greater concentration by _____.
a.
facilitated diffusion
c.
passive transport
b.
osmosis
d.
active transport
 

 6. 
Which of the following might be a result of a disease that causes a thickened plasma membrane?
a.
increased movement of molecules leaving the cell
b.
decreased movement of molecules entering the cell
c.
decreased movement of molecules within the cell
d.
increased movement of molecules entering the cell
 

 7. 
A plasma membrane is made up of a(n) _____.
a.
protein layer
c.
lipid bilayer
b.
enzyme bilayer
d.
cholesterol layer
 

 8. 
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
 

 9. 
The structure most responsible for maintaining cell homeostasis is the _____.
a.
mitochondrion
c.
cell wall
b.
cytoplasm
d.
plasma membrane
 

 10. 
If a cell is placed in salt water, water leaves the cell by _____.
a.
phagocytosis
c.
diffusion
b.
active transport
d.
osmosis
 



 
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