Question 1

How do the cholesterol molecules depicted in the figure below enhance membrane fluidity?

Accepted Answer

They interfere with

Question 2

A rat cell and a chimpanzee cell are fused together.Antibodies to chimpanzee membrane antigens are labeled with rhodamine (a red fluorescent molecule)and antibodies against rat antigens are labeled with fluorescein (a green fluorescent molecule).What do the cells look like immediately after fusion? What about 40 minutes later? If the temperature of the cell is increased,what should happen?

Accepted Answer

Immediately after fusion,half of the cel

Question 3

What happens to phospholipid mobility when the cell is treated with agents that disrupt the underlying membrane skeleton?

Accepted Answer

A) Their mobility is unchanged. 
B) Their mobility is increased because the fences that normally restrict their diffusion are removed. 
C) Their mobility is decreased because the fences that normally restrict their diffusion are removed. 
D) Their mobility is increased because the treatment raises the temperature. 
E) Their mobility is decreased because the treatment lowers the temperature. 
A) Their mobility is unchanged. 
B) Their mobility is increased because the fences that normally restrict their diffusion are removed. 
C) Their mobility is decreased because the fences that normally restrict their diffusion are removed. 
D) Their mobility is increased because the treatment raises the temperature. 
E) Their mobility is decreased because the treatment lowers the temperature.

Question 4

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 5

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 6

Hemolytic anemias are characterized by fragile,abnormally shaped erythrocytes; the disease has been traced to mutations in ________.

Accepted Answer

A) actin 
B) ankyrin 
C) hemoglobin 
D) spectrin 
E) both ankyrin and spectrin 
A) actin 
B) ankyrin 
C) hemoglobin 
D) spectrin 
E) both ankyrin and spectrin

Question 7

What is thought to be important in maintaining the native structure of the Kv channel membrane protein and promoting its function as a voltage-gated channel.

Accepted Answer

A) negatively charged cholesterol 
B) positively charged sphingolipids 
C) negatively charged phospholipids 
D) positively charged phospholipids 
E) negatively charged sphingolipids 
A) negatively charged cholesterol 
B) positively charged sphingolipids 
C) negatively charged phospholipids 
D) positively charged phospholipids 
E) negatively charged sphingolipids

Question 8

The ability,possessed by all organisms,to respond to external stimulation is known as _______.

Accepted Answer

A) excitation 
B) irritability 
C) irritation 
D) irrigation 
E) irrigatability 
A) excitation 
B) irritability 
C) irritation 
D) irrigation 
E) irrigatability

Question 9

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 10

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.

Question 11

Long-term potentiation is associated with NMDA receptors,one of several types of receptors that bind to the excitatory neurotransmitter _______.Its binding opens an internal cation channel within the receptor that allows _____ influx into the postsynaptic neuron,triggering a cascade of biochemical changes that lead to synaptic strengthening.

Accepted Answer

A) GABA,Ca2+ ion 
B) glutamate,Ca2+ ion 
C) glutamate,K+ ion 
D) GABA,K+ ion 
E) acetylcholine,Ca2+ ion 
A) GABA,Ca2+ ion 
B) glutamate,Ca2+ ion 
C) glutamate,K+ ion 
D) GABA,K+ ion 
E) acetylcholine,Ca2+ ion

Question 12

___________ is a process that strengthens certain synapses by repeated neuron stimulation over a short time period.

Accepted Answer

A) Denturation 
B) Long term potentiation 
C) Short term memory 
D) Temporality 
E) Long term deviation 
A) Denturation 
B) Long term potentiation 
C) Short term memory 
D) Temporality 
E) Long term deviation

Question 13

_________ is the movement of a substance from an area of high concentration to an area of lower concentration.

Accepted Answer

A) Denaturation 
B) Osmosis 
C) Diffusion 
D) Transport 
E) Defusion 
A) Denaturation 
B) Osmosis 
C) Diffusion 
D) Transport 
E) Defusion

Question 14

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 15

Which of the following is not a function of peripheral proteins?

Accepted Answer

A) mechanical support for membrane 
B) enzymes 
C) receptors 
D) anchor for integral proteins 
E) factors that transmit transmembrane signals 
A) mechanical support for membrane 
B) enzymes 
C) receptors 
D) anchor for integral proteins 
E) factors that transmit transmembrane signals

Question 16

How was it proved that the cystic fibrosis transmembrane conductance regulator (CFTR)was actually a chloride transporter?

Accepted Answer

The gene responsible for cystic fibrosis

Question 17

In the figure below,the bilayer shown is below the transition temperature and the movement of the molecules is greatly restricted.What words can be used to describe this bilayer?

Accepted Answer

The answer of In the figure below,the bilayer shown is...

Question 18

You modify the gene for an integral membrane protein so that the cytoplasmic portions of the protein are deleted.When the gene is inserted in cells,what happens to the mobility of this protein in the membrane?

Accepted Answer

A) They move much greater distances than the intact protein. 
B) They move much smaller distances than the intact protein. 
C) They do not move at all. 
D) They are not inserted into the membrane so nothing can be learned about their mobility. 
E) They flip to the opposite leaflet. 
A) They move much greater distances than the intact protein. 
B) They move much smaller distances than the intact protein. 
C) They do not move at all. 
D) They are not inserted into the membrane so nothing can be learned about their mobility. 
E) They flip to the opposite leaflet.

Question 19

What are the building blocks of a phosphoglyceride,specifically phosphatidic acid?

Accepted Answer

A) glycerol + 2 phosphate groups + 1 fatty acid 
B) glycerol + 1 phosphate group + 2 fatty acids 
C) glycerol + 1 phosphate group 
D) glycerol + 3 fatty acids 
E) glycerol + 1 phosphate group + 3 fatty acids 
A) glycerol + 2 phosphate groups + 1 fatty acid 
B) glycerol + 1 phosphate group + 2 fatty acids 
C) glycerol + 1 phosphate group 
D) glycerol + 3 fatty acids 
E) glycerol + 1 phosphate group + 3 fatty acids

Question 20

Usually,optical tweezers drag integral proteins a limited distance before they encounter a barrier that causes their release; upon release,they typically spring backward.What does this suggest?

Accepted Answer

A) the presence of solid barriers 
B) the presence of elastic barriers 
C) the attachment of the proteins to the cytoskeleton 
D) the attachment of the proteins to the endoplasmic reticulum 
E) the presence of rubber in the membrane 
A) the presence of solid barriers 
B) the presence of elastic barriers 
C) the attachment of the proteins to the cytoskeleton 
D) the attachment of the proteins to the endoplasmic reticulum 
E) the presence of rubber in the membrane

How do the cholesterol molecules depicted in the figure below enhance membrane fluidity?

What happens to phospholipid mobility when the cell is treated with agents that disrupt the underlying membrane skeleton?

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

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 .

Hemolytic anemias are characterized by fragile,abnormally shaped erythrocytes; the disease has been traced to mutations in ________.

What is thought to be important in maintaining the native structure of the Kv channel membrane protein and promoting its function as a voltage-gated channel.

The ability,possessed by all organisms,to respond to external stimulation is known as _______.

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?

___________ is a process that strengthens certain synapses by repeated neuron stimulation over a short time period.

_________ is the movement of a substance from an area of high concentration to an area of lower concentration.

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

Which of the following is not a function of peripheral proteins?

How was it proved that the cystic fibrosis transmembrane conductance regulator (CFTR)was actually a chloride transporter?

In the figure below,the bilayer shown is below the transition temperature and the movement of the molecules is greatly restricted.What words can be used to describe this bilayer?

You modify the gene for an integral membrane protein so that the cytoplasmic portions of the protein are deleted.When the gene is inserted in cells,what happens to the mobility of this protein in the membrane?

What are the building blocks of a phosphoglyceride,specifically phosphatidic acid?

Usually,optical tweezers drag integral proteins a limited distance before they encounter a barrier that causes their release; upon release,they typically spring backward.What does this suggest?

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

How do the cholesterol molecules depicted in the figure below enhance membrane fluidity?

What happens to phospholipid mobility when the cell is treated with agents that disrupt the underlying membrane skeleton?

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

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 ________.

Hemolytic anemias are characterized by fragile,abnormally shaped erythrocytes; the disease has been traced to mutations in ________.

What is thought to be important in maintaining the native structure of the Kv channel membrane protein and promoting its function as a voltage-gated channel.

The ability,possessed by all organisms,to respond to external stimulation is known as _______.

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?

___________ is a process that strengthens certain synapses by repeated neuron stimulation over a short time period.

_________ is the movement of a substance from an area of high concentration to an area of lower concentration.

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

Which of the following is not a function of peripheral proteins?

How was it proved that the cystic fibrosis transmembrane conductance regulator (CFTR)was actually a chloride transporter?

In the figure below,the bilayer shown is below the transition temperature and the movement of the molecules is greatly restricted.What words can be used to describe this bilayer?

You modify the gene for an integral membrane protein so that the cytoplasmic portions of the protein are deleted.When the gene is inserted in cells,what happens to the mobility of this protein in the membrane?

What are the building blocks of a phosphoglyceride,specifically phosphatidic acid?

Usually,optical tweezers drag integral proteins a limited distance before they encounter a barrier that causes their release; upon release,they typically spring backward.What does this suggest?

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

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

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 .