Question 1

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

Accepted Answer

A)  ɑ helices of nonpolar amino acids that pass through the membrane. 
B)  ɑ helices 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)  ɑ helices of nonpolar amino acids that pass through the membrane. 
B)  ɑ helices 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 2

Describe the selectivity of the potassium ion channel.

Accepted Answer

There are critical amino acids on helica

Question 3

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 4

What is multidrug resistance?

Accepted Answer

Cells may develop a resistance

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:

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

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 7

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 8

________________ 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 9

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

Accepted Answer

Liposomes are spherical structures of li

Question 10

Why are membranes impermeable to most substances?

Accepted Answer

The hydrophobic core of the membrane mak

Exam 12: Membrane Structure and Function

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

Describe the selectivity of the potassium ion channel.

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

What is multidrug resistance?

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:

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

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

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

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

Why are membranes impermeable to most substances?

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