Question 1

What is the role of tight junctions in the transport of glucose across the intestinal epithelium?

Accepted Answer

A)  They open and allow glucose to pass between the epithelial cells. 
B)  They keep the Na+-K+ pumps in the apical membrane only. 
C)  They keep the Na+-glucose cotransporter in the apical membrane and the glucose-facilitated transporter in the basolateral membrane. 
D)  They keep the glucose-facilitated transporter in the apical membrane and the Na+-glucose cotransporter in the basolateral membrane. 
A)  They open and allow glucose to pass between the epithelial cells. 
B)  They keep the Na+-K+ pumps in the apical membrane only. 
C)  They keep the Na+-glucose cotransporter in the apical membrane and the glucose-facilitated transporter in the basolateral membrane. 
D)  They keep the glucose-facilitated transporter in the apical membrane and the Na+-glucose cotransporter in the basolateral membrane.

Question 2

Plasma membrane glycolipids are found

Accepted Answer

A)  exclusively in the inner leaflet. 
B)  exclusively in the outer leaflet. 
C)  equally distributed between the inner and outer leaflets. 
D)  only on the basal surface of epithelia. 
A)  exclusively in the inner leaflet. 
B)  exclusively in the outer leaflet. 
C)  equally distributed between the inner and outer leaflets. 
D)  only on the basal surface of epithelia.

Question 3

In their acceptance speech for the Nobel Prize in 1985, Michael Brown and Joseph Goldstein said, "Cholesterol is a Janus-faced molecule. The very property that makes it useful in cell membranes, namely its absolute insolubility in water, also makes it lethal." Explain this remark.

Accepted Answer

Cholesterol in the plasma membranes main

Question 4

Cholesterol is taken up into most cells of the body by

Accepted Answer

A)  phagocytosis. 
B)  receptor-mediated endocytosis. 
C)  simple diffusion. 
D)  caveolae formation. 
A)  phagocytosis. 
B)  receptor-mediated endocytosis. 
C)  simple diffusion. 
D)  caveolae formation.

Question 5

Some endocytic receptors are _______ from endosomes, while others are _______ in lysosomes.

Accepted Answer

The answer of Some endocytic receptors are _______ from endosomes,...

Question 6

How is rapid transport of water across the plasma membrane achieved?

Accepted Answer

The presence of aquaporin in t

Question 7

The Na+ and K+ channels involved in the propagation of an action potential are _______-gated.

Accepted Answer

Question 8

Active transport can be driven by _______ hydrolysis or by _______ gradients.

Accepted Answer

The answer of Active transport can be driven by _______...

Question 9

The two erythrocyte proteins glycophorin and band 3 are examples of

Accepted Answer

A)  peripheral proteins. 
B)  transmembrane proteins. 
C)  cytoskeletal proteins. 
D)  $\beta$-barrel proteins. 
A)  peripheral proteins. 
B)  transmembrane proteins. 
C)  cytoskeletal proteins. 
D)  $\beta$-barrel proteins.

Question 10

The potentially oncogenic signal-transmitting proteins Src and Ras are attached to the inner surface of the plasma membrane by covalent links to _______.

Accepted Answer

membrane lipids (myr

Question 11

The endocytic trafficking pathway of ligands and receptors in eukaryotic cells is often controlled by sequential differences in _______ between early endosomes, late endosomes, and lysosomes.

Accepted Answer

The answer of The endocytic trafficking pathway of ligands and...

Question 12

The plasma membrane's barrier to passive diffusion is primarily a function of the membrane's

Accepted Answer

A)  phospholipids. 
B)  cholesterol. 
C)  proteins. 
D)  glycoproteins. 
A)  phospholipids. 
B)  cholesterol. 
C)  proteins. 
D)  glycoproteins.

Question 13

Gorter and Grendel's classic experiment allowed them to observe that the erythrocyte plasma membrane contains _______ the surface area of the erythrocytes.

Accepted Answer

A)  enough lipid to occupy a monolayer equal to 
B)  enough lipid to occupy a monolayer equal to twice 
C)  less lipid than would occupy a monolayer equal to 
D)  enough lipid to occupy a monolayer equal to one-half 
A)  enough lipid to occupy a monolayer equal to 
B)  enough lipid to occupy a monolayer equal to twice 
C)  less lipid than would occupy a monolayer equal to 
D)  enough lipid to occupy a monolayer equal to one-half

Question 14

The K+-glucose transporter is an example of a symport that actively transports glucose into cells.

Accepted Answer

A) True 
 B)False

Question 15

What is the mechanism by which cells take up specific macromolecules?

Accepted Answer

Cells take up specif

Question 16

A major feature included in the updated fluid mosaic model is the

Accepted Answer

A)  interaction of transmembrane proteins with the cytoskeleton. 
B)  restriction of glycolipids to the extracellular face of the plasma membrane. 
C)  presence of multiple pass transmembrane proteins. 
D)  presence of N-linked oligosaccharide side chains on glycoproteins at the cell surface. 
A)  interaction of transmembrane proteins with the cytoskeleton. 
B)  restriction of glycolipids to the extracellular face of the plasma membrane. 
C)  presence of multiple pass transmembrane proteins. 
D)  presence of N-linked oligosaccharide side chains on glycoproteins at the cell surface.

Question 17

The membrane-spanning portion of a single-pass transmembrane protein is usually a secondary structure called a(n) _______.

Accepted Answer

α helix (a

Question 18

Facilitated diffusion differs from passive diffusion in that facilitated diffusion is

Accepted Answer

A)  mediated only by a protein channel. 
B)  mediated only by a protein carrier. 
C)  mediated by a protein carrier or channel. 
D)  against the concentration gradient. 
A)  mediated only by a protein channel. 
B)  mediated only by a protein carrier. 
C)  mediated by a protein carrier or channel. 
D)  against the concentration gradient.

Question 19

Caveolae are rich in cholesterol and other constituents of lipid rafts.

Accepted Answer

A) True 
 B)False

Question 20

Clusters of _______ in membrane proteins such as band 3 of the erythrocyte can define hydrophilic segments through which ions (for example, bicarbonate and chloride) can be transported.

Accepted Answer

A)  oligosaccharide side chains 
B)  lipid modifications 
C)  transmembrane α helices 
D)  phosphorylation motifs 
A)  oligosaccharide side chains 
B)  lipid modifications 
C)  transmembrane α helices 
D)  phosphorylation motifs

What is the role of tight junctions in the transport of glucose across the intestinal epithelium?

Plasma membrane glycolipids are found

In their acceptance speech for the Nobel Prize in 1985, Michael Brown and Joseph Goldstein said, "Cholesterol is a Janus-faced molecule. The very property that makes it useful in cell membranes, namely its absolute insolubility in water, also makes it lethal." Explain this remark.

Cholesterol is taken up into most cells of the body by

Some endocytic receptors are _ from endosomes, while others are _ in lysosomes.

How is rapid transport of water across the plasma membrane achieved?

The Na⁺ and K⁺ channels involved in the propagation of an action potential are _______-gated.

Active transport can be driven by _ hydrolysis or by _ gradients.

The two erythrocyte proteins glycophorin and band 3 are examples of

The potentially oncogenic signal-transmitting proteins Src and Ras are attached to the inner surface of the plasma membrane by covalent links to _______.

The endocytic trafficking pathway of ligands and receptors in eukaryotic cells is often controlled by sequential differences in _______ between early endosomes, late endosomes, and lysosomes.

The plasma membrane's barrier to passive diffusion is primarily a function of the membrane's

Gorter and Grendel's classic experiment allowed them to observe that the erythrocyte plasma membrane contains _______ the surface area of the erythrocytes.

The K⁺-glucose transporter is an example of a symport that actively transports glucose into cells.

What is the mechanism by which cells take up specific macromolecules?

A major feature included in the updated fluid mosaic model is the

The membrane-spanning portion of a single-pass transmembrane protein is usually a secondary structure called a(n) _______.

Facilitated diffusion differs from passive diffusion in that facilitated diffusion is

Caveolae are rich in cholesterol and other constituents of lipid rafts.

Clusters of _______ in membrane proteins such as band 3 of the erythrocyte can define hydrophilic segments through which ions (for example, bicarbonate and chloride) can be transported.

An Overview of Cells and Cell Research

Molecules and Membranes

Bioenergetics and Metabolism

Fundamentals of Molecular Biology

Genomics, Proteomics, and Systems Biology

Genes and Genomes

Replication, Maintenance, and Rearrangements of Genomic Dna

RNA Synthesis and Processing

Transcriptional Regulation and Epigenetics

Protein Synthesis, Processing, and Regulation

The Nucleus

Protein Sorting and Transport

Mitochondria, Chloroplasts, and Peroxisomes

The Cytoskeleton and Cell Movement

Cell Walls, the Extracellular Matrix, and Cell Interactions

Cell Signaling

The Cell Cycle

Cell Death and Cell Renewal

Cancer

Filters

Exam 15: The Plasma Membrane

What is the role of tight junctions in the transport of glucose across the intestinal epithelium?

Plasma membrane glycolipids are found

In their acceptance speech for the Nobel Prize in 1985, Michael Brown and Joseph Goldstein said, "Cholesterol is a Janus-faced molecule. The very property that makes it useful in cell membranes, namely its absolute insolubility in water, also makes it lethal." Explain this remark.

Cholesterol is taken up into most cells of the body by

Some endocytic receptors are _______ from endosomes, while others are _______ in lysosomes.

How is rapid transport of water across the plasma membrane achieved?

The Na+ and K+ channels involved in the propagation of an action potential are _______-gated.

Active transport can be driven by _______ hydrolysis or by _______ gradients.

The two erythrocyte proteins glycophorin and band 3 are examples of

The potentially oncogenic signal-transmitting proteins Src and Ras are attached to the inner surface of the plasma membrane by covalent links to _______.

The endocytic trafficking pathway of ligands and receptors in eukaryotic cells is often controlled by sequential differences in _______ between early endosomes, late endosomes, and lysosomes.

The plasma membrane's barrier to passive diffusion is primarily a function of the membrane's

Gorter and Grendel's classic experiment allowed them to observe that the erythrocyte plasma membrane contains _______ the surface area of the erythrocytes.

The K+-glucose transporter is an example of a symport that actively transports glucose into cells.

What is the mechanism by which cells take up specific macromolecules?

A major feature included in the updated fluid mosaic model is the

The membrane-spanning portion of a single-pass transmembrane protein is usually a secondary structure called a(n) _______.

Facilitated diffusion differs from passive diffusion in that facilitated diffusion is

Caveolae are rich in cholesterol and other constituents of lipid rafts.

Clusters of _______ in membrane proteins such as band 3 of the erythrocyte can define hydrophilic segments through which ions (for example, bicarbonate and chloride) can be transported.

An Overview of Cells and Cell Research

Molecules and Membranes

Bioenergetics and Metabolism

Fundamentals of Molecular Biology

Genomics, Proteomics, and Systems Biology

Genes and Genomes

Replication, Maintenance, and Rearrangements of Genomic Dna

RNA Synthesis and Processing

Transcriptional Regulation and Epigenetics

Protein Synthesis, Processing, and Regulation

The Nucleus

Protein Sorting and Transport

Mitochondria, Chloroplasts, and Peroxisomes

The Cytoskeleton and Cell Movement

Cell Walls, the Extracellular Matrix, and Cell Interactions

Cell Signaling

The Cell Cycle

Cell Death and Cell Renewal

Cancer

Filters

Some endocytic receptors are _ from endosomes, while others are _ in lysosomes.

The Na⁺ and K⁺ channels involved in the propagation of an action potential are _______-gated.

Active transport can be driven by _ hydrolysis or by _ gradients.

The K⁺-glucose transporter is an example of a symport that actively transports glucose into cells.