Question 1

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
-____________: This substance inhibits prostaglandin H2 synthase-1 by blocking the channel through which the substrate, arachidonate, travels.
A)glycolipids
B)closed biomolecular sheets
C)lateral diffusion
D)integral
E)hydrophobic effect
F)acetylsalicylic acid (aspirin)
G)water
H)lipid raft
I)hydrophobic
J)ions
K)high
L)peripheral
M)low

Accepted Answer

Aspirin inhibits prostaglandin H2 synthase-1 by blocking the channel through which the substrate, arachidonate, travels.

Question 2

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
-Lipid biolayers spontaneously form ____________.
A)glycolipids
B)closed biomolecular sheets
C)lateral diffusion
D)integral
E)hydrophobic effect
F)acetylsalicylic acid (aspirin)
G)water
H)lipid raft
I)hydrophobic
J)ions
K)high
L)peripheral
M)low

Accepted Answer

B

Question 3

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
-____________: A complex between cholesterol and membrane phospholipids.
A)glycolipids
B)closed biomolecular sheets
C)lateral diffusion
D)integral
E)hydrophobic effect
F)acetylsalicylic acid (aspirin)
G)water
H)lipid raft
I)hydrophobic
J)ions
K)high
L)peripheral
M)low

Accepted Answer

The term "lipid raft" refers to a specific type of membrane microdomain that is enriched in cholesterol and sphingolipids. The complex between cholesterol and membrane phospholipids is a defining feature of these raft domains.

Answer: A and H 
 Both glycolipids and lipid rafts involve specific types of membrane microdomains that are enriched in particular lipid species (in the case of glycolipids, they are enriched in glycolipid molecules; in the case of lipid rafts, they are enriched in cholesterol and sphingolipids). However, glycolipids do not necessarily require the presence of cholesterol, so H is the more specific choice for this question.

Question 4

_______________ inserts into lipid bilayers, disrupting interactions between fatty acids, thereby helping to maintain membrane fluidity.

Accepted Answer

The answer of _______________ inserts into lipid bilayers, disrupting interactions...

Question 5

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
-The driving force for the formation of membrane bilayers is/are the:
A)glycolipids
B)closed biomolecular sheets
C)lateral diffusion
D)integral
E)hydrophobic effect
F)acetylsalicylic acid (aspirin)
G)water
H)lipid raft
I)hydrophobic
J)ions
K)high
L)peripheral
M)low

Accepted Answer

The driving force for the formation of membrane bilayers is the hydrophobic effect, which causes the hydrophobic tails of phospholipids to associate with each other in the interior of the membrane, away from water.

Question 6

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
-____________ membrane proteins are embedded in the hydrocarbon chains of membrane lipids.
A)glycolipids
B)closed biomolecular sheets
C)lateral diffusion
D)integral
E)hydrophobic effect
F)acetylsalicylic acid (aspirin)
G)water
H)lipid raft
I)hydrophobic
J)ions
K)high
L)peripheral
M)low

Accepted Answer

Integral membrane proteins are embedded within the membrane, meaning they are surrounded by the hydrocarbon chains of the membrane lipids.

Answer: H
 Lipid rafts are specialized regions within the membrane that have a high concentration of specific lipids and proteins. Some integral membrane proteins may be found within lipid rafts.

Answer: I
 The hydrocarbon chains of membrane lipids are hydrophobic, meaning they do not interact well with water. Integral membrane proteins must have hydrophobic regions in order to be embedded within these chains.

Question 7

Membranes are said to be ____________ because their two faces always differ from each other.

Accepted Answer

The answer of Membranes are said to be ____________ because...

Question 8

The _______________ of small molecules is correlated with their relative solubilities in water and nonpolar solvents.

Accepted Answer

The answer of The _______________ of small molecules is correlated...

Question 9

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
-____________: These membrane components contain carbohydrates.
A)glycolipids
B)closed biomolecular sheets
C)lateral diffusion
D)integral
E)hydrophobic effect
F)acetylsalicylic acid (aspirin)
G)water
H)lipid raft
I)hydrophobic
J)ions
K)high
L)peripheral
M)low

Accepted Answer

Glycolipids are the membrane components that contain carbohydrates.

Question 10

_______________ membrane proteins are bound primarily by electrostatic and hydrogen-bond interactions with the head groups of lipids.

Accepted Answer

The answer of _______________ membrane proteins are bound primarily by...

Question 11

Most cell membranes are electrically polarized, the inside being _______________ relative to the outside.

Accepted Answer

The answer of Most cell membranes are electrically polarized, the...

Question 12

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
-____________: The type of amino acid found in the transmembrane helix of an integral protein.
A)glycolipids
B)closed biomolecular sheets
C)lateral diffusion
D)integral
E)hydrophobic effect
F)acetylsalicylic acid (aspirin)
G)water
H)lipid raft
I)hydrophobic
J)ions
K)high
L)peripheral
M)low

Accepted Answer

The transmembrane helices of integral proteins are typically composed of hydrophobic amino acids, which allow the protein to stably interact with the hydrophobic core of the lipid bilayer.

Question 13

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
-____________: The process by which lipids and proteins move in the membrane bilayer.
A)glycolipids
B)closed biomolecular sheets
C)lateral diffusion
D)integral
E)hydrophobic effect
F)acetylsalicylic acid (aspirin)
G)water
H)lipid raft
I)hydrophobic
J)ions
K)high
L)peripheral
M)low

Accepted Answer

Lateral diffusion is the process by which lipids and proteins move laterally in the membrane bilayer.

Answer: H
 Lipid rafts are specific regions of the membrane enriched in certain lipids and proteins that aid in lateral diffusion and other membrane functions.

Question 14

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
-____________ has a high permeability through lipid bilayers.
A)glycolipids
B)closed biomolecular sheets
C)lateral diffusion
D)integral
E)hydrophobic effect
F)acetylsalicylic acid (aspirin)
G)water
H)lipid raft
I)hydrophobic
J)ions
K)high
L)peripheral
M)low

Accepted Answer

The answer of Use the following to answer questions
Choose the...

Question 15

The rate of lateral diffusion is such that a phospholipid molecule can travel from one end of a bacterium to the other in _______________ of time.

Accepted Answer

The answer of The rate of lateral diffusion is such...

Question 16

________________ is the noncovalent force which favors close packing of the tails of the lipids in a membrane.

Accepted Answer

The answer of ________________ is the noncovalent force which favors...

Question 17

The temperature at which a phospholipid membrane transitions from a rigid to a fluid state is referred to as _______________.

Accepted Answer

The answer of The temperature at which a phospholipid membrane...

Question 18

_______________ are bilayer lipid vesicles with an aqueous compartment.

Accepted Answer

The answer of _______________ are bilayer lipid vesicles with an...

Question 19

Use the following to answer questions
Choose the correct answer from the list below. Not all of the answers will be used.
-Cells maintain a ____________ concentration of intracellular potassium as compared to the extracellular concentration.
A)glycolipids
B)closed biomolecular sheets
C)lateral diffusion
D)integral
E)hydrophobic effect
F)acetylsalicylic acid (aspirin)
G)water
H)lipid raft
I)hydrophobic
J)ions
K)high
L)peripheral
M)low

Accepted Answer

The sentence states that cells maintain a high concentration of intracellular potassium as compared to the extracellular concentration.

Question 20

An increase in the ratio of saturated to unsaturated fatty acid chains in a membrane _______________ the fluidity of the membrane.

Accepted Answer

The answer of An increase in the ratio of saturated...

Quiz 12: Membrane Structure and Function

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -____________: This substance inhibits prostaglandin H2 synthase-1 by blocking the channel through which the substrate, arachidonate, travels.

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -Lipid biolayers spontaneously form ____________.

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -____________: A complex between cholesterol and membrane phospholipids.

_______________ inserts into lipid bilayers, disrupting interactions between fatty acids, thereby helping to maintain membrane fluidity.

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -The driving force for the formation of membrane bilayers is/are the:

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -____________ membrane proteins are embedded in the hydrocarbon chains of membrane lipids.

Membranes are said to be ____________ because their two faces always differ from each other.

The _______________ of small molecules is correlated with their relative solubilities in water and nonpolar solvents.

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -____________: These membrane components contain carbohydrates.

_______________ membrane proteins are bound primarily by electrostatic and hydrogen-bond interactions with the head groups of lipids.

Most cell membranes are electrically polarized, the inside being _______________ relative to the outside.

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -____________: The type of amino acid found in the transmembrane helix of an integral protein.

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -____________: The process by which lipids and proteins move in the membrane bilayer.

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -____________ has a high permeability through lipid bilayers.

The rate of lateral diffusion is such that a phospholipid molecule can travel from one end of a bacterium to the other in _______________ of time.

________________ is the noncovalent force which favors close packing of the tails of the lipids in a membrane.

The temperature at which a phospholipid membrane transitions from a rigid to a fluid state is referred to as _______________.

_______________ are bilayer lipid vesicles with an aqueous compartment.

Use the following to answer questions Choose the correct answer from the list below. Not all of the answers will be used. -Cells maintain a ____________ concentration of intracellular potassium as compared to the extracellular concentration.

An increase in the ratio of saturated to unsaturated fatty acid chains in a membrane _______________ the fluidity of the membrane.