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AP Biology
Membranes
28
Biology
12th Grade
01/09/2008
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Term
Hydrophobic/hydrophilic interactions of phospholipids can produce a molecular arangement to form which of the following?
a.
a lipid bilayer.
b.
hydrolysis of the fatty acids.
c.
a protein membrane.
d.
a cytoskeleton.
e.
a nonpolar membrane.
 Definition

 

 

a.
a lipid bilayer.

 
Term
Which of the following statements is true?
a.
When lipids and water are mixed, it is the water molecules that isolate themselves into droplets.
b.
When lipids and water are mixed, the lipids dissolve and enter into a solution.
c.
Lipids are classified as nonpolar substances and will not mix with water.
d.
Polar substances are able to pass through a plasma membrane more readily than nonpolar substances.
e.
All portions of a phospholipid molecule found in a membrane are classified as nonpolar.
 Definition

 

 

Lipids are classified as nonpolar substances and will not mix with water.

 
Term
A hypothetical "microbullet" shot, from the outside, through a phospholipid bilayer would pass the components in which order?
a.
tail >>> tail >>> head >>> head
b.
head >>> tail >>> head >>> tail
c.
tail >>> head >>> head >>> tail
d.
head >>> tail >>> tail >>> head
e.
head >>> head >>> tail >>> tail
 Definition

 

 

d.
head >>> tail >>> tail >>> head

 
Term
If a plasma membrane were compared to a sandwich, __________ would be considered the filling.
a.
cholesterol
b.
protein
c.
hydrophilic heads
d.
hydrophobic tails
e.
carbohydrates
 Definition

 

 

d.
hydrophobic tails

 
Term
Which of the following is true for the unsaturated tails of lipids in a membrane?
a.
are hydrophilic.
b.
are unstable and tend to break apart.
c.
have kinks in them and lessen the interaction between adjacent fat molecules.
d.
will break whenever exposed to phosphate ions.
e.
all of these
 Definition

 

 

c.
have kinks in them and lessen the interaction between adjacent fat molecules.

 
Term
 
In an attempt to visualize the fluid mosaic model of a membrane, we could describe the __________ as floating in a sea of __________.
a.
lipid; protein
b.
phospholipids; carbohydrate
c.
proteins; lipid
d.
fats; water
e.
glycolipids; sterols
 Definition

 

 

c.
proteins; lipid

 
Term
Which of the following explains how a membrane is more "fluid" than solid?
a.
phospholipid tails prevent close packing.
b.
proteins can shift positions.
c.
water is the main component.
d.
phospholipid tails prevent close packing and proteins can shift positions.
e.
phospholipid tails prevent close packing, proteins can shift positions, and water is the main component.
 Definition

 

d.
phospholipid tails prevent close packing and proteins can shift positions.

 
Term
Which of the following statements is false?
a.
The plasma membrane is more like a fluid than a solid.
b.
The cell membrane is symmetrical, so it is impossible to identify which is the extracellular surface.
c.
The glycoproteins have their sugar side chains on the outside of the cell membrane.
d.
The plasma membrane is in constant movement, with proteins shifting positions.
e.
There are functional differences between the two sides of the plasma membranes.
 Definition

 

 

b.
The cell membrane is symmetrical, so it is impossible to identify which is the extracellular surface.

 
Term
Glycolipids differ from other membrane lipids in what way?
a.
They have hydrophilic heads.
b.
They have hydrophobic heads.
c.
They have molecules of a monosaccharide associated with them.
d.
They have saturated and partially unsaturated tails.
e.
They are stationary molecules found scattered throughout the membrane.
 Definition

 

 

c.
They have molecules of a monosaccharide associated with them.

 
Term
Which statement is true of plasma membranes?
a.
They have molecules on their surfaces that identify them.
b.
They are essentially impermeable.
c.
They are basically static, nonchanging structures.
d.
They are hydrophilic barriers between cells.
e.
They function primarily through the activity of their carbohydrates.
 Definition

 

 

a.
They have molecules on their surfaces that identify them.

 
Term
A transport protein is most analogous to which of the following?
a.
water pipe.
b.
subway train.
c.
light switch.
d.
voice identification device.
e.
television receiver.
 Definition

 

 

b.
subway train.

 
Term
Most of the “functions” of plasma membranes are carried out by which component?
a.
cholesterol.
b.
proteins.
c.
hydrophilic heads.
d.
hydrophobic tails.
e.
carbohydrates.
 Definition

 

 

b.
proteins.

 
Term
Which of the following are true for simple diffusion?
a.
the rate of movement of molecules is controlled by temperature and pressure.
b.
the movement of individual molecules is random.
c.
the net movement of molecules of a substance in system reaches equilibrium.
d.
the net movement is away from the region of highest concentration.
e.
all of these
 Definition

 

 

 

e. ALL 
Term
Oxygen, carbon dioxide, glucose, and other small molecules cross the plasma membrane through which process(es)?
a.
osmosis.
b.
diffusion.
c.
endocytosis and exocytosis.
d.
active transport.
e.
active diffusion.
 Definition

 

 

b.
diffusion.

 
Term
Which is the general term for the movement of a molecule against a concentration gradient?
a.
simple diffusion.
b.
facilitated diffusion.
c.
osmosis.
d.
active transport.
e.
bulk flow.
 Definition

 

 

d.
active transport.

 
Term
Which of the following does NOT require the participation of a membrane protein?
a.
active transport
b.
ion pump
c.
facilitated diffusion
d.
simple diffusion
e.
all of these require a protein
 Definition

 

 

d.
simple diffusion

 
Term
The sodium-potassium pump is an example of which of the following?
a.
simple diffusion.
b.
facilitated diffusion.
c.
osmosis.
d.
active transport.
e.
bulk flow.
 Definition

 

 

d.
active transport.

 
Term
What are the carrier molecules used in active transport?
a.
ions
b.
proteins.
c.
ATP molecules.
d.
carbohydrates.
e.
lipids.
 Definition

 

 

b.
proteins.

 
Term
A single-celled freshwater organism, such as a protistan, is transferred to saltwater. Which of the following is likely to happen?
a.
The cell bursts.
b.
Salt is pumped out of the cell.
c.
The cell shrinks.
d.
Enzymes flow out of the cell.
e.
all of these
 Definition

 

 

c.
The cell shrinks.

 
Term
Which statement is true?
a.
A cell placed in an isotonic solution will swell.
b.
A cell placed in a hypotonic solution will swell.
c.
A cell placed in a hypotonic solution will shrink.
d.
A cell placed in a hypertonic solution will remain the same size.
e.
A cell placed in a hypotonic solution will remain the same size.
 Definition

 

 

b.
A cell placed in a hypotonic solution will swell.

 
Term
Which statement is true?
a.
The movement of solvent occurs from a hypotonic solution to an isotonic solution.
b.
The net movement from an isotonic to a hypotonic solution involves the movement of solute molecules only.
c.
The concentration of the solute is greater in an isotonic solution than in a hypertonic solution.
d.
The concentration of the solvent is greater in a hypertonic solution than in an isotonic solution.
e.
Osmosis involves only hypertonic solutions.
 Definition

 

a.
The movement of solvent occurs from a hypotonic solution to an isotonic solution.

 
Term
Which statement is true?
a.
The movement of solvent occurs from a hypotonic solution to an isotonic solution.
b.
The net movement from an isotonic to a hypotonic solution involves the movement of solute molecules only.
c.
The concentration of the solute is greater in an isotonic solution than in a hypertonic solution.
d.
The concentration of the solvent is greater in a hypertonic solution than in an isotonic solution.
e.
Osmosis involves only hypertonic solutions.
 Definition

 

 

The movement of solvent occurs from a hypotonic solution to an isotonic solution.

Term
A red blood cell will lyse (burst) when placed in which of the following kinds of solution?
a.
hypotonic
b.
hypertonic
c.
isotonic
d.
any of the above
e.
none of these
 Definition

 

 

a.
hypotonic

 
Term
Bulk flow differs from osmosis in that bulk flow
a.
involves molecules that are not all alike.
b.
goes against pressure gradients.
c.
is intracellular.
d.
is the reverse of osmosis.
e.
is used only by plants.
 Definition

 

 

involves molecules that are not all alike.

 
Term
Which of the following is NOT a form of passive transport?
a.
osmosis
b.
facilitated diffusion
c.
bulk flow
d.
exocytosis
e.
none of these
 Definition

 

 

d.
exocytosis

 
Term
 
The action of a white blood cell engulfing a bacterium is
a.
pinocytosis.
b.
phagocytosis.
c.
exocytosis.
d.
endocytosis.
e.
phagocytosis and endocytosis.
 Definition

 

 

e.
phagocytosis and endocytosis.

 
Term
Exocytotic vesicles develop from the membranes of which of the following structures?
a.
mitochondria
b.
Golgi bodies
c.
lysosomes
d.
vacuoles
e.
phagocytes
 Definition

 

 

b.
Golgi bodies

 
Term
Osmotically induced shrinkage of a cells cytoplasm is known as what?
a.
turgor pressure
b.
plasmolysis
c.
phagocytosis
d.
endocytosis
e.
exocytosis
 Definition

 

 

b.
plasmolysis

 
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