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- 1. Multiple Choice
Identify cholesterol molecule
structure a
structure b
structure h
structure i
- 2. Multiple Choice
Identify a peripheral protein
structure a
strucure b
structure g
structure h
- 3. Multiple Choice
Plasma membranes are selectively permeable. This means
anything can pass in and out
the membrane regulates the passage of the material in and out of the cell
glucose cannot enter the cell
cholesterol cannot enter
- 4. Multiple Choice
Which is NOT a function of the membrane?
it forms a selective barrier
it has receptors for chemical messages
it is the control center of the cell
it is involved in self recognition
- 5. Multiple Choice
Small, nonpolar, hydrophobic molecules such as fatty acids
easily pass through the membrane's bilayer
very slowly diffuse through the bilayer
require transport proteins
enter through endocytosis
- 6. Multiple Choice
Membrane phospholipids
have hydrophobic heads that face the center of the membrane and are shielded from water
have hydrophilic tails that face outward
remain fluid because they are tightly packed
none of these
- 7. Multiple Choice
Which of the following substances would have the most trouble crossing the membrane by diffusing through the bilayer?
water
oxygen
carbon dioxide
a sodium ion
- 8. Multiple Choice
The cholesterol associated with membranes
is attached to proteins and extends into the environment surrounding the cell
helps stabilize the membrane at body temperature
is an abnormality resulting from a diet high in cholesterol
both a and c
- 9. Multiple Choice
A major function of glycoproteins and glycolipids in the membane is to
glue cells together to form tissues
allow cells to identify each other
attach membrane to cytoskeleton
help retain shape
- 10. Multiple Choice
When doctors perform organ transplants, they choose a donor tissue match. Which component is being matched?
membrane phospholipids
cytoskeleton
cell surface carbohydrates
cholesterol
- 11. Multiple Choice
The fluid mosaic model describes a membrane consisting of
a phospholipid bilayer with embedded proteins
2 layers of phospholipids with proteins in between
individual proteins and phospholipids that can drift
both a and c
- 12. Multiple Choice
What kinds of molecules pass through a cell membrane most easily?
ionic
small and hydrophobic
large polar
large and hydrophobic
- 13. Multiple Choice
Which of the following allows water to move faster across cell membranes?
aquaporins
ATP
peripheral proteins
the sodium-potassium pump
- 14. Multiple Choice
Which structure is the hydrophilic polar head of the phospholipid molecule?
F
D
C
A1
- 15. Multiple Choice
Which structure is the hydrophobic tail of the phospholipid molecule?
E
B
G
A2
- 16. Multiple Choicelateral movement of phospholipids occur more often than flip-flop movementtruefalse
- 17. Multiple ChoiceHow does cholesterol affect the cell membrane in low temperatures?helps it from becoming too rigidmakes it more viscousdenatures itassures it solidifies
- 18. Multiple ChoiceThe function of the plasma membrane is....regulate what enters and leaves the cell.fight bacteria and viruses that enter the cell.make sure each cell reproducesmake sure each cell can move
- 19. Multiple Choice
The majority of the plasma membrane is composed of ______.
phospholipids
proteins
carbohydrates
cholesterol
- 20. Multiple Choice
What property does the phospholipid bilayer give to a plasma membrane?
provides the barrier between the inside and outside of the cell
communicates between cells
conducts electrical impulses in nerve cells
allows cells to bind to each other
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