Question 1

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

Accepted Answer

negative

Question 2

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.

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 H

Question 3

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 ____________.

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 B

Question 4

Draw a bilayer membrane that has both an integral and peripheral protein present.

Accepted Answer

The membrane should be depicted as a bil

Question 5

How are lipid bilayers formed? What is the driving force?

Accepted Answer

Bimolecular sheets of lipids form sponta

Question 6

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 7

What force(s) stabilize(s) the lipid bilayers?

Accepted Answer

A)  van der Waals interactions 
B)  electrostatic and hydrogen bonding between the polar heads and surrounding water 
C)  covalent bonds between the lipid tails 
D)  covalent bonds between the lipids and membrane proteins 
E)  A and B 
A)  van der Waals interactions 
B)  electrostatic and hydrogen bonding between the polar heads and surrounding water 
C)  covalent bonds between the lipid tails 
D)  covalent bonds between the lipids and membrane proteins 
E)  A and B

Question 8

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 9

Why do most phospholipids preferentially form sheets instead of micelles?

Accepted Answer

The two tails in pho

Question 10

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.

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 11

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

Accepted Answer

The amino acids that cross the membrane

Question 12

Which of the following membranes would be the most fluid?

Accepted Answer

A)  a bilayer made of lipids with polyunsaturated 18-carbon fatty acids 
B)  a bilayer made of lipids with saturated 18-carbon fatty acids 
C)  a bilayer made of lipids with saturated 16-carbon fatty acids 
D)  a bilayer made of lipids with polyunsaturated 16-carbon fatty acids 
E)  All of the above are equivalent in fluidity. 
A)  a bilayer made of lipids with polyunsaturated 18-carbon fatty acids 
B)  a bilayer made of lipids with saturated 18-carbon fatty acids 
C)  a bilayer made of lipids with saturated 16-carbon fatty acids 
D)  a bilayer made of lipids with polyunsaturated 16-carbon fatty acids 
E)  All of the above are equivalent in fluidity.

Question 13

Draw a cross-section of a membrane bilayer and a liposome.

Accepted Answer

Bilayers have two lipid layers in which

Question 14

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...

Question 15

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 16

An antiporter and a symporter are examples of:

Accepted Answer

A)  passive diffusion. 
B)  primary active transporters. 
C)  entropy-driven pores. 
D)  an ABC transporter. 
E)  a secondary transporter. 
A)  passive diffusion. 
B)  primary active transporters. 
C)  entropy-driven pores. 
D)  an ABC transporter. 
E)  a secondary transporter.

Question 17

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

Accepted Answer

Lipid rafts are cholesterol-ri

Question 18

The energy for __________ transport comes from the gradient itself. .

Accepted Answer

A)  active 
B)  facilitated 
C)  passive 
D)  pumped 
E)  ATP-mediated 
A)  active 
B)  facilitated 
C)  passive 
D)  pumped 
E)  ATP-mediated

Question 19

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.

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 20

Digitalis is a cardiotonic steroid that does not act like a steroid. Instead, its function is to inhibit:

Accepted Answer

A)  the Na+-K+ pump. 
B)  fatty acid intake. 
C)  calcium channels. 
D)  potassium and sodium pores. 
E)  dropsy channel. 
A)  the Na+-K+ pump. 
B)  fatty acid intake. 
C)  calcium channels. 
D)  potassium and sodium pores. 
E)  dropsy channel.

Exam 12: Membrane Structure and Function

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. -____________: A complex between cholesterol and membrane phospholipids.

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 ____________.

Draw a bilayer membrane that has both an integral and peripheral protein present.

How are lipid bilayers formed? What is the driving force?

Which of the following helps regulate membrane fluidity in animals?

What force(s) stabilize(s) the lipid bilayers?

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

Why do most phospholipids preferentially form sheets instead of micelles?

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.

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

Which of the following membranes would be the most fluid?

Draw a cross-section of a membrane bilayer and a liposome.

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

Which of the following is true?

An antiporter and a symporter are examples of:

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

The energy for __________ transport comes from the gradient itself. .

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.

Digitalis is a cardiotonic steroid that does not act like a steroid. Instead, its function is to inhibit:

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