Question 1

Carbohydrate residues attached to the membrane lipids are:

Accepted Answer

A)  always positioned on the intracellular side of the membrane. 
B)  always positioned on the inside center of the bilayer. 
C)  always positioned on the extracellular side of the membrane. 
D)  always positioned equally on both sides of the membrane. 
E)  also covalently attached to membrane proteins. 
A)  always positioned on the intracellular side of the membrane. 
B)  always positioned on the inside center of the bilayer. 
C)  always positioned on the extracellular side of the membrane. 
D)  always positioned equally on both sides of the membrane. 
E)  also covalently attached to membrane proteins.

Question 2

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

Question 3

How many molecules thick are membranes?

Accepted Answer

A)  2 
B)  1 
C)  infinite 
D)  they are of varying thickness, depending on their structure 
E)  None of the above. 
A)  2 
B)  1 
C)  infinite 
D)  they are of varying thickness, depending on their structure 
E)  None of the above.

Question 4

The most common motif found in membrane-spanning proteins is:

Accepted Answer

A)  α helices of nonpolar amino acids that pass through the membrane. 
B)  αhelices of charged amino acids that form channels via extensive hydrogen bonding. 
C)  a triple helix of ɑ helices. 
D)  a helix-turn-helix arrangement of the peptide strands. 
E)  None of the above. 
A)  α helices of nonpolar amino acids that pass through the membrane. 
B)  αhelices of charged amino acids that form channels via extensive hydrogen bonding. 
C)  a triple helix of ɑ helices. 
D)  a helix-turn-helix arrangement of the peptide strands. 
E)  None of the above.

Question 5

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 6

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 7

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

Question 8

Describe the selectivity of the potassium ion channel.

Accepted Answer

There are critical amino acids on helica

Question 9

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

Exam 12: Membrane Structure and Function

Carbohydrate residues attached to the membrane lipids are:

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

How many molecules thick are membranes?

The most common motif found in membrane-spanning proteins is:

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

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

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

Describe the selectivity of the potassium ion channel.

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

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