Question 1

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 2

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.

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 3

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:

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 4

How do proteins function to make membranes selectively permeable?

Accepted Answer

Many of the proteins found in

Question 5

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 6

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 7

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

Accepted Answer

The membrane should be depicted as a bil

Question 8

What is the function of prostaglandin H2 synthase-1? How does its position in the membrane facilitate its activity?

Accepted Answer

Prostaglandin H2 synthase-1 converts ara

Question 9

Digitalis is a cardiotoinic 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.

Question 10

Flip flopping of lipids takes place once in several hours.  This is evidence for what?

Accepted Answer

That the transverse diffusion

Question 11

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.

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 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

_______________ 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 14

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

Accepted Answer

Bimolecular sheets of lipids form sponta

Question 15

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

Accepted Answer

Bilayers have two lipid layers in which

Question 16

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.

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

What are liposomes? What are some of their current commercial applications?

Accepted Answer

Liposomes are spherical structures of li

Question 18

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

Accepted Answer

Tm, or mel

Question 19

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

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

Which is the proper order of permeability of molecules across a membrane, from the most permeable to the least?

Accepted Answer

A)  water, glucose, urea, sodium ion 
B)  water, indole, glucose, sodium ion 
C)  water, indole, sodium ion, glucose 
D)  indole, glucose, urea, sodium ion 
E)  indole, water, glucose, sodium ion 
A)  water, glucose, urea, sodium ion 
B)  water, indole, glucose, sodium ion 
C)  water, indole, sodium ion, glucose 
D)  indole, glucose, urea, sodium ion 
E)  indole, water, glucose, sodium ion

Exam 12: Membrane Structure and Function

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

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.

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:

How do proteins function to make membranes selectively permeable?

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.

An antiporter and a symporter are examples of:

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

What is the function of prostaglandin H2 synthase-1? How does its position in the membrane facilitate its activity?

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

Flip flopping of lipids takes place once in several hours. This is evidence for what?

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.

Which of the following membranes would be the most fluid?

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

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

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

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.

What are liposomes? What are some of their current commercial applications?

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

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

Which is the proper order of permeability of molecules across a membrane, from the most permeable to the least?

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

What is the function of prostaglandin H₂ synthase-1? How does its position in the membrane facilitate its activity?