Question 1

Which disease below is caused by the deterioration of the myelin sheath?

Accepted Answer

A) myasthenia gravis 
B) multiple sclerosis 
C) muscular dystrophy 
D) diabetes mellitus 
E) lupus erythematosus 
A) myasthenia gravis 
B) multiple sclerosis 
C) muscular dystrophy 
D) diabetes mellitus 
E) lupus erythematosus

Question 2

How are the new "stealth liposomes" protected from immune system phagocytes?

Accepted Answer

A) They are kept cold before use. 
B) They are coated with carbohydrates. 
C) They are given a synthetic polymer coating that protects them from immune destruction. 
D) They are loaded with radioactive isotopes. 
E) They are colored red. 
A) They are kept cold before use. 
B) They are coated with carbohydrates. 
C) They are given a synthetic polymer coating that protects them from immune destruction. 
D) They are loaded with radioactive isotopes. 
E) They are colored red.

Question 3

Tetrahydrocannabinol,the active ingredient in marijuana,binds to receptors located in the ________ terminals of certain brain neurons.It lowers the likelihood that these neurons will release ________.

Accepted Answer

A) postsynaptic,neurotransmitters 
B) presynaptic,neurotransmitters 
C) presynaptic,Ca2+ ions 
D) postsynaptic,Ca2+ ions 
E) dendritic,neurotransmitters 
A) postsynaptic,neurotransmitters 
B) presynaptic,neurotransmitters 
C) presynaptic,Ca2+ ions 
D) postsynaptic,Ca2+ ions 
E) dendritic,neurotransmitters

Question 4

You are characterizing an isolated membrane protein.The protein is exposed on both sides of the membrane.Over much of the central part of its surface,there are hydrophobic amino acids,while the ends are hydrophilic.It crosses the membrane a number of times.There is an opening in the center of this protein lined by hydrophilic amino acids.What kind of protein is this and what is its probable function?

Accepted Answer

It is a polytopic protein (a p

Question 5

Why are the proteins being separated on an SDS polyacrylamide gel attracted equally to the positive electrode?

Accepted Answer

A) They carry a relatively uniform positive charge distribution 
B) They carry a relatively uniform negative charge distribution. 
C) They are all the same molecular weight. 
D) They are all the same size. 
E) They all have the same degree of hydrophobicity. 
A) They carry a relatively uniform positive charge distribution 
B) They carry a relatively uniform negative charge distribution. 
C) They are all the same molecular weight. 
D) They are all the same size. 
E) They all have the same degree of hydrophobicity.

Question 6

You have fused a mouse cell and a human cell and then treated the cell with specific antibodies that are covalently linked to fluorescent dyes (antibodies to mouse proteins - green;antibodies to human proteins - red).What does the cell look like immediately after fusion?

Accepted Answer

A) The cell is half red and half green. 
B) The red and green labels are uniformly distributed across the entire membrane. 
C) The red and green labels are distributed in intermingled patches. 
D) The cell appears to be yellow in color. 
E) The cell appears to be brown in color. 
A) The cell is half red and half green. 
B) The red and green labels are uniformly distributed across the entire membrane. 
C) The red and green labels are distributed in intermingled patches. 
D) The cell appears to be yellow in color. 
E) The cell appears to be brown in color.

Question 7

As an action potential is initiated,the membrane is ______.This is caused by the ____ of ____ ions.

Accepted Answer

A) hyperpolarized,efflux,Na+ 
B) depolarized,influx,Na+ 
C) depolarized,influx,K+ 
D) hyperpolarized,influx,Na+ 
E) depolarized,efflux,Na+ 
A) hyperpolarized,efflux,Na+ 
B) depolarized,influx,Na+ 
C) depolarized,influx,K+ 
D) hyperpolarized,influx,Na+ 
E) depolarized,efflux,Na+

Question 8

Which of the following genetic diseases is characterized by fragile,abnormally shaped erythrocytes and has been traced to mutations in ankyrin or spectrin?

Accepted Answer

A) hemophilia 
B) sickle cell anemia 
C) hemolytic anemias 
D) leukemia 
E) erythroblastosis 
A) hemophilia 
B) sickle cell anemia 
C) hemolytic anemias 
D) leukemia 
E) erythroblastosis

Question 9

What is thought to cause the sodium channels that initiate an action potential to be inactivated for a brief time after being open for about 1 msec?

Accepted Answer

A) a higher positive charge 
B) a higher negative charge 
C) the random diffusion of an inactivation peptide into the opening of the channel pore 
D) removal of a peptide from the channel protein 
E) covalent addition of a peptide to the cytoplasmic end of the channel protein 
A) a higher positive charge 
B) a higher negative charge 
C) the random diffusion of an inactivation peptide into the opening of the channel pore 
D) removal of a peptide from the channel protein 
E) covalent addition of a peptide to the cytoplasmic end of the channel protein

Question 10

Which of the following is not a potential biological role of the lipid asymmetry of the plasma membrane?

Accepted Answer

A) The glycolipids in the outer leaflet of the membrane may serve as receptors. 
B) The presence of phosphatidylinositol primarily in the inner leaflet is involved in signal transduction. 
C) Maintenance of a charge differential in the two membrane leaflets. 
D) Appearance of phosphatidylserine on the outer surface of aging lymphocytes marks them for destruction by macrophages. 
E) Phosphatidylserine on the surface of platelets serves as a signal for blood solubilization. 
A) The glycolipids in the outer leaflet of the membrane may serve as receptors. 
B) The presence of phosphatidylinositol primarily in the inner leaflet is involved in signal transduction. 
C) Maintenance of a charge differential in the two membrane leaflets. 
D) Appearance of phosphatidylserine on the outer surface of aging lymphocytes marks them for destruction by macrophages. 
E) Phosphatidylserine on the surface of platelets serves as a signal for blood solubilization.

Question 11

Which site in a neuron receives incoming information from external sources?

Accepted Answer

A) Dendrites 
B) Axon 
C) Axon hillock 
D) Terminal knob 
E) Cell body 
A) Dendrites 
B) Axon 
C) Axon hillock 
D) Terminal knob 
E) Cell body

Question 12

Which of the following is not a function of membranes?

Accepted Answer

A) transporting solutes 
B) scaffold for biochemical activities 
C) energy transduction 
D) signal transition 
E) signal transduction 
A) transporting solutes 
B) scaffold for biochemical activities 
C) energy transduction 
D) signal transition 
E) signal transduction

Question 13

Which of the following can be learned from a computer-based (computational)analysis of the amino acid sequence of a membrane protein,which can be readily deduced from the nucleotide sequence of its isolated gene?

Accepted Answer

A) its structure 
B) its color 
C) its orientation within the lipid bilayer 
D) its population in each cell 
E) both its structure and its orientation within the lipid bilayer 
A) its structure 
B) its color 
C) its orientation within the lipid bilayer 
D) its population in each cell 
E) both its structure and its orientation within the lipid bilayer

Question 14

While culturing some cells,you lower the temperature of the culture.What happens immediately to the membrane fluidity?

Accepted Answer

A) Nothing happens. 
B) The membrane becomes less fluid. 
C) The membrane becomes more fluid. 
D) The membrane fluidity fluctuates back and forth from high to low. 
E) The membrane fluidity fluctuates back and forth from low to high. 
A) Nothing happens. 
B) The membrane becomes less fluid. 
C) The membrane becomes more fluid. 
D) The membrane fluidity fluctuates back and forth from high to low. 
E) The membrane fluidity fluctuates back and forth from low to high.

Which disease below is caused by the deterioration of the myelin sheath?

How are the new "stealth liposomes" protected from immune system phagocytes?

Tetrahydrocannabinol,the active ingredient in marijuana,binds to receptors located in the terminals of certain brain neurons.It lowers the likelihood that these neurons will release .

Why are the proteins being separated on an SDS polyacrylamide gel attracted equally to the positive electrode?

You have fused a mouse cell and a human cell and then treated the cell with specific antibodies that are covalently linked to fluorescent dyes (antibodies to mouse proteins - green;antibodies to human proteins - red).What does the cell look like immediately after fusion?

As an action potential is initiated,the membrane is __.This is caused by the of ions.

Which of the following genetic diseases is characterized by fragile,abnormally shaped erythrocytes and has been traced to mutations in ankyrin or spectrin?

What is thought to cause the sodium channels that initiate an action potential to be inactivated for a brief time after being open for about 1 msec?

Which of the following is not a potential biological role of the lipid asymmetry of the plasma membrane?

Which site in a neuron receives incoming information from external sources?

Which of the following is not a function of membranes?

Which of the following can be learned from a computer-based (computational)analysis of the amino acid sequence of a membrane protein,which can be readily deduced from the nucleotide sequence of its isolated gene?

While culturing some cells,you lower the temperature of the culture.What happens immediately to the membrane fluidity?

Introduction to the Study of Cell and Molecular Biology

The Chemical Basis of Life

Bioenergetics, Enzymes, and Metabolism

Aerobic Respiration and the Mitochondrion

Photosynthesis and the Chloroplast

Interactions Between Cells and Their Environment

Cytoplasmic Membrane Systems: Structure, Function, and Membrane Trafficking

The Cytoskeleton and Cell Motility

The Nature of the Gene and the Genome

Gene Expression: From Transcription to Translation

Control of Gene Expression

Dna Replication and Repair

Cellular Reproduction

Cell Signaling and Signal Transduction: Communication Between Cells

Cancer

The Immune Response

Techniques in Cell and Molecular Biology

Filters

Exam 4: The Structure and Function of the Plasma Membrane

Which disease below is caused by the deterioration of the myelin sheath?

How are the new "stealth liposomes" protected from immune system phagocytes?

Tetrahydrocannabinol,the active ingredient in marijuana,binds to receptors located in the ________ terminals of certain brain neurons.It lowers the likelihood that these neurons will release ________.

Why are the proteins being separated on an SDS polyacrylamide gel attracted equally to the positive electrode?

You have fused a mouse cell and a human cell and then treated the cell with specific antibodies that are covalently linked to fluorescent dyes (antibodies to mouse proteins - green;antibodies to human proteins - red).What does the cell look like immediately after fusion?

As an action potential is initiated,the membrane is ______.This is caused by the ____ of ____ ions.

Which of the following genetic diseases is characterized by fragile,abnormally shaped erythrocytes and has been traced to mutations in ankyrin or spectrin?

What is thought to cause the sodium channels that initiate an action potential to be inactivated for a brief time after being open for about 1 msec?

Which of the following is not a potential biological role of the lipid asymmetry of the plasma membrane?

Which site in a neuron receives incoming information from external sources?

Which of the following is not a function of membranes?

Which of the following can be learned from a computer-based (computational)analysis of the amino acid sequence of a membrane protein,which can be readily deduced from the nucleotide sequence of its isolated gene?

While culturing some cells,you lower the temperature of the culture.What happens immediately to the membrane fluidity?

Introduction to the Study of Cell and Molecular Biology

The Chemical Basis of Life

Bioenergetics, Enzymes, and Metabolism

Aerobic Respiration and the Mitochondrion

Photosynthesis and the Chloroplast

Interactions Between Cells and Their Environment

Cytoplasmic Membrane Systems: Structure, Function, and Membrane Trafficking

The Cytoskeleton and Cell Motility

The Nature of the Gene and the Genome

Gene Expression: From Transcription to Translation

Control of Gene Expression

Dna Replication and Repair

Cellular Reproduction

Cell Signaling and Signal Transduction: Communication Between Cells

Cancer

The Immune Response

Techniques in Cell and Molecular Biology

Filters

Tetrahydrocannabinol,the active ingredient in marijuana,binds to receptors located in the terminals of certain brain neurons.It lowers the likelihood that these neurons will release .

As an action potential is initiated,the membrane is __.This is caused by the of ions.