1 Which of the following is FALSE about channel proteins?
a.
transfers molecules one at a time by changing conformation
b.
binds with greatest specificity of all membrane transport proteins
c.
small charged molecules can travel through
d.
A & B
e.
A & C
2. Provides energy and acts as cell surface marker
a.
Phosphatidylserine
b.
Glycolipids
c.
Inositol phospholipids
d.
Spingomyelin
3. How can proteins cross a phospholipid bilayer?
a.
transport vesicles
b.
nuclear pores
c.
protein translocators
d.
A & B
e.
all of the above
4. How does cholesterol in animal cell membranes affect the fluidity of the bilayer?
a.
Cholesterol tends to stiffen the bilayer
b.
Cholesterol tends to make the bilayer more fluid
c.
Cholesterol has little effect on membrane fluidity
d.
A & B
5. In mammalian cells, how many Na+ molecules are transferred out of a cell and how many K+ molecules are transferred into a cell?
a.
Both molecules travel freely in and out of the cell
b.
3 Na+ and 2 K+
c.
1 Na+ and 2 K+
d.
2 Na+ and 3 K+
e.
2 Na+ and 1 K+
6. Which of the following is NOT an extracellular signal used to control arrangement of actin filaments?
a.
Cdc7
b.
Surplus of Ca2+
c.
Rac activation
d.
A & B
e.
B & C
1 Which of the following is FALSE about channel proteins?
a. | transfers molecules one at a time by changing conformation | |
b. | binds with greatest specificity of all membrane transport proteins | |
c. | small charged molecules can travel through | |
d. | A & B | |
e. | A & C |
2. Provides energy and acts as cell surface marker
a. | Phosphatidylserine | |
b. | Glycolipids | |
c. | Inositol phospholipids | |
d. | Spingomyelin |
3. How can proteins cross a phospholipid bilayer?
a. | transport vesicles | |
b. | nuclear pores | |
c. | protein translocators | |
d. | A & B | |
e. | all of the above |
4. How does cholesterol in animal cell membranes affect the fluidity of the bilayer?
a. | Cholesterol tends to stiffen the bilayer | |
b. | Cholesterol tends to make the bilayer more fluid | |
c. | Cholesterol has little effect on membrane fluidity | |
d. | A & B |
5. In mammalian cells, how many Na+ molecules are transferred out of a cell and how many K+ molecules are transferred into a cell?
a. | Both molecules travel freely in and out of the cell | |
b. | 3 Na+ and 2 K+ | |
c. | 1 Na+ and 2 K+ | |
d. | 2 Na+ and 3 K+ | |
e. | 2 Na+ and 1 K+ |
6. Which of the following is NOT an extracellular signal used to control arrangement of actin filaments?
a. | Cdc7 | |
b. | Surplus of Ca2+ | |
c. | Rac activation | |
d. | A & B | |
e. | B & C |
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