Question 1

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

Accepted Answer

van der Waals

Question 2

The degree of membrane fluidity depends on:

Accepted Answer

A)  the percentage of lipids that contain choline. 
B)  the percentage of glycolipids. 
C)  the percentage of free fatty acids. 
D)  the percentage of unsaturated fatty acids. 
E)  None of the above. 
A)  the percentage of lipids that contain choline. 
B)  the percentage of glycolipids. 
C)  the percentage of free fatty acids. 
D)  the percentage of unsaturated fatty acids. 
E)  None of the above. D

Question 3

How do secondary transporters drive the transport of a substance up its concentration gradient?

Accepted Answer

The thermodynamically uphill flow of one molecule is coupled to the downhill flow of another.

Question 4

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

Accepted Answer

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 
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

Question 5

Why are membranes impermeable to most substances?

Accepted Answer

The hydrophobic core of the membrane mak

Question 6

What is multi-drug resistance?

Accepted Answer

Cells may develop a resistance

Question 7

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 8

Which of the following is true?

Accepted Answer

A)  Membranes are lipid bilayers. 
B)  Membrane lipids have both hydrophobic and hydrophilic properties. 
C)  Many membranes are electrically polarized. 
D)  All of the above. 
E)  None of the above. 
A)  Membranes are lipid bilayers. 
B)  Membrane lipids have both hydrophobic and hydrophilic properties. 
C)  Many membranes are electrically polarized. 
D)  All of the above. 
E)  None of the above.

Question 9

The low incidence of protein or lipid flip-flop in a membrane preserves:

Accepted Answer

A)  membrane fluidity. 
B)  membrane melting temperatures. 
C)  membrane asymmetry. 
D)  All of the above. 
E)  None of the above. 
A)  membrane fluidity. 
B)  membrane melting temperatures. 
C)  membrane asymmetry. 
D)  All of the above. 
E)  None of the above.

Question 10

Why do most phospholipids preferentially form sheets instead of micelles?

Accepted Answer

The two tails in pho

Question 11

_______________ are bilayer lipid vesicles with an aqueous compartment.

Accepted Answer

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

Question 12

What are the key biochemical elements for transmembrane-spanning proteins?

Accepted Answer

The amino acids that cross the membrane

Question 13

_______________ 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 14

Describe a lipid raft and its potential role in a cell.

Accepted Answer

Lipid rafts are cholesterol-ri

Question 15

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 16

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.

Accepted Answer

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 
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

Question 17

The fluorescence recovery after photobleaching (FRAP) technique has been used to study:

Accepted Answer

A)  membrane composition. 
B)  the lateral diffusion in membranes. 
C)  protein structural motifs in membranes. 
D)  All of the above. 
E)  None of the above. 
A)  membrane composition. 
B)  the lateral diffusion in membranes. 
C)  protein structural motifs in membranes. 
D)  All of the above. 
E)  None of the above.

Question 18

Which of the following helps regulate membrane fluidity in animals?

Accepted Answer

A)  protein 
B)  cholesterol 
C)  ATP 
D)  magnesium ion 
E)  None of the above. 
A)  protein 
B)  cholesterol 
C)  ATP 
D)  magnesium ion 
E)  None of the above.

Question 19

Describe the effect of introducing a sodium ion pore into a membrane containing the Na+-glucose symporter.

Accepted Answer

A high extracellular concentration of so

Question 20

Which of the following statements is consistent with the structure of biological membranes?

Accepted Answer

A)  All membrane proteins are integral and associate with the hydrophobic region of the membrane. 
B)  Both proteins and lipids readily undergo transverse ("flip-flop") diffusion from the inside to the outside of the membrane. 
C)  Membranes are symmetric. 
D)  The membrane lipids self-assemble to form the lipid bilayer. 
E)  A biological membrane consists of proteins sandwiched between two layers of lipids, which is referred to as a lipid bilayer. 
A)  All membrane proteins are integral and associate with the hydrophobic region of the membrane. 
B)  Both proteins and lipids readily undergo transverse ("flip-flop") diffusion from the inside to the outside of the membrane. 
C)  Membranes are symmetric. 
D)  The membrane lipids self-assemble to form the lipid bilayer. 
E)  A biological membrane consists of proteins sandwiched between two layers of lipids, which is referred to as a lipid bilayer.

Exam 12: Membrane Structure and Function

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

The degree of membrane fluidity depends on:

How do secondary transporters drive the transport of a substance up its concentration gradient?

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

Why are membranes impermeable to most substances?

What is multi-drug resistance?

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.

Which of the following is true?

The low incidence of protein or lipid flip-flop in a membrane preserves:

Why do most phospholipids preferentially form sheets instead of micelles?

_______________ are bilayer lipid vesicles with an aqueous compartment.

What are the key biochemical elements for transmembrane-spanning proteins?

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

Describe a lipid raft and its potential role in a cell.

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

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.

The fluorescence recovery after photobleaching (FRAP) technique has been used to study:

Which of the following helps regulate membrane fluidity in animals?

Describe the effect of introducing a sodium ion pore into a membrane containing the Na+-glucose symporter.

Which of the following statements is consistent with the structure of biological membranes?

Biochemistry and the Unity of Life

Water, Weak Bonds, and the Generation of Order Out of Chaos

Amino Acids

Protein Three-Dimensional Structure

Techniques in Protein Biochemistry

Basic Concepts of Enzyme Action

Kinetics and Regulation

Mechanisms and Inhibitors

Hemoglobin: an Allosteric Protein

Carbohydrates

Lipids

Signal Transduction Pathways

Digestion: Turning a Meal Into Cellular Biochemicals

Metabolism: Basic Concepts and Design

Glycolysis

Gluconeogenesis

Preparation for the Cycle

Harvesting Electrons From the Cycle

The Electron Transport Chain

The Proton-Motive Force

The Light Reactions

The Calvin Cycle

Glycogen Degradation

Glycogen Synthesis

The Pentose Phosphate Pathway

Fatty Acid Degredation

Fatty Acid Synthesis

Lipid Synthesis

Amino Acid Degradation and the Urea Cycle

Amino Acids Synthesis

Nucleotide Metabolism

The Structure of Informational Macromolecules: Dna and Rna

DNA Replication

DNA Repair and Recombination

RNA Synthesis and Regulation in Prokaryotes

Gene Expression in Eukaryotes

RNA Processing in Eukaryotes

The Genetic Code

The Mechanism of Protein Synthesis

Recombinant DNA Techniques

Filters

Describe the effect of introducing a sodium ion pore into a membrane containing the Na⁺-glucose symporter.