Question 1

You inject labeled keratin subunits into cultured skin cells. What happens a few minutes later?

Accepted Answer

A) The keratin subunits remain in the cytoplasmic keratin subunit pool. 
B) Filaments become labeled at sites scattered throughout their length, rather than at their ends. 
C) Filaments become labeled at both ends simultaneously. 
D) Filaments become labeled at one end exclusively. 
E) The entire intermediate filament network is quickly labeled. 
A) The keratin subunits remain in the cytoplasmic keratin subunit pool. 
B) Filaments become labeled at sites scattered throughout their length, rather than at their ends. 
C) Filaments become labeled at both ends simultaneously. 
D) Filaments become labeled at one end exclusively. 
E) The entire intermediate filament network is quickly labeled.

Question 2

What kind of cells seems to rely mostly on microfilaments for long-distance transport of cytoplasmic vesicles and organelles, probably due to restricted microtubule distribution in these cells?

Accepted Answer

A) red blood cells 
B) white blood cells 
C) plant cells 
D) neurons 
E) muscle cells 
A) red blood cells 
B) white blood cells 
C) plant cells 
D) neurons 
E) muscle cells

Question 3

What protein is responsible for intraflagellar transport of IFT trainsback toward the cell body?

Accepted Answer

A) kinesin-II 
B) myosin 
C) cytoplasmic dynein 
D) kinesin 
E) cytoplasmic kinesin 
A) kinesin-II 
B) myosin 
C) cytoplasmic dynein 
D) kinesin 
E) cytoplasmic kinesin

Question 4

Which of the following traits is NOT seen upon close examination of a living growth cone of an elongating axon?

Accepted Answer

A) a broad, flattened lamellipodium that creeps out over the substratum 
B) stiffmicrospikes pointing outward to the edge of the lamellipodium 
C) many cilia that attach to the substratum and pull the growth cone forward 
D) highly elongated filopodia that extend and retract continuously 
E) none of these choices is observed 
A) a broad, flattened lamellipodium that creeps out over the substratum 
B) stiffmicrospikes pointing outward to the edge of the lamellipodium 
C) many cilia that attach to the substratum and pull the growth cone forward 
D) highly elongated filopodia that extend and retract continuously 
E) none of these choices is observed

Question 5

Which region of the sarcomere contains only actin thin filaments or actin filaments?

Accepted Answer

A) A bands 
B) H zones 
C) I bands 
D) Z lines 
E) M lines 
A) A bands 
B) H zones 
C) I bands 
D) Z lines 
E) M lines

Question 6

Along which structure do membranous vesicles and organelles typically engage in local movement in the cell periphery of an animal cell?

Accepted Answer

A) mitochondria 
B) microtubules 
C) actin filaments 
D) intermediate filaments 
E) lysosomes 
A) mitochondria 
B) microtubules 
C) actin filaments 
D) intermediate filaments 
E) lysosomes

Question 7

Which type of cytoskeletal element is characterized as a hollow, rigid cylindrical tube with walls composed of tubulin subunits?

Accepted Answer

A) microfilaments 
B) microtubules 
C) intermediate filaments 
D) minitubules 
A) microfilaments 
B) microtubules 
C) intermediate filaments 
D) minitubules

Question 8

The microtubule wall is composed of globular proteins arranged in longitudinal rows called _________.

Accepted Answer

A) actin filaments 
B) protofilaments 
C) prototubules 
D) prototubulins 
E) microtubular units 
A) actin filaments 
B) protofilaments 
C) prototubules 
D) prototubulins 
E) microtubular units

Question 9

The protein Crescentin (CreS)has been implicated in regulating the shape of some bacterial cells and forms bundled filaments that give bacteria containing it a highly curved shape; it resembles __________ in structure.

Accepted Answer

A) actin filaments 
B) microtubules 
C) titin 
D) intermediate filaments 
E) ParM 
A) actin filaments 
B) microtubules 
C) titin 
D) intermediate filaments 
E) ParM

Question 10

Which element of the cytoskeleton is found in the cytoplasm and the nucleus?

Accepted Answer

A) actin filaments 
B) microtubules 
C) intermediate filaments 
D) macrofilaments 
E) indeterminate filaments 
A) actin filaments 
B) microtubules 
C) intermediate filaments 
D) macrofilaments 
E) indeterminate filaments

Question 11

The cross-bridges that hold intermediate filaments together are composed of _______.

Accepted Answer

A) filamentin 
B) plectin 
C) ascriptin 
D) dynein 
E) myosin 
A) filamentin 
B) plectin 
C) ascriptin 
D) dynein 
E) myosin

Question 12

What part of the molecular motor kinesin is responsible for binding to the cargo to be hauled?

Accepted Answer

A) the motor domain 
B) the neck 
C) the rod-like stalk 
D) the fan-shaped tail 
E) the motor domain and the neck 
A) the motor domain 
B) the neck 
C) the rod-like stalk 
D) the fan-shaped tail 
E) the motor domain and the neck

Question 13

Nucleation of microtubules takes place rapidly inside a cell, where it occurs in association with a variety of specialized structures called _____________.

Accepted Answer

A) MTOCs 
B) the centrosome 
C) basal bodies 
D) microtubule-organizing centers 
E) all terms are correct 
A) MTOCs 
B) the centrosome 
C) basal bodies 
D) microtubule-organizing centers 
E) all terms are correct

Question 14

In a growing plant cell, cellulose microfibrils are oriented _______ the direction of cell growth.

Accepted Answer

A) in the same direction as 
B) perpendicular to 
C) parallel to 
D) diagonally to 
E) horizontal to 
A) in the same direction as 
B) perpendicular to 
C) parallel to 
D) diagonally to 
E) horizontal to

Question 15

Proteins that accelerate the polymerization of actin filaments are called ________.

Accepted Answer

A) nucleons 
B) nucleating proteins 
C) monomer-sequestering proteins 
D) end-blocking proteins 
E) nucleons and nucleating proteins 
A) nucleons 
B) nucleating proteins 
C) monomer-sequestering proteins 
D) end-blocking proteins 
E) nucleons and nucleating proteins

Question 16

What is the name of the largest protein yet discovered? It extends from the M line in the center of the sarcomere along the myosin filament and past the A band to terminate at the Z line.

Accepted Answer

A) troponin 
B) myosin 
C) actinin 
D) titin 
E) tropomyosin 
A) troponin 
B) myosin 
C) actinin 
D) titin 
E) tropomyosin

Question 17

How are microtubules thought to affect cell shape in plants?

Accepted Answer

A) Microtubules of the plant cell cortex are thought to affect the movement of cellulose-synthesizing enzymes in the cell membrane, which, in turn, affect cell wall growth and shape. 
B) Microtubules of the plant cell vacuole are thought to affect the movement of cellulose-synthesizing enzymes in the cell membrane, which, in turn, affect cell wall growth and shape. 
C) Microtubules of the plant cell cortex are thought to affect the movement of lipid-synthesizing enzymes in the cell membrane, which, in turn, affect cell wall growth and shape. 
D) Microtubules of the plant cell wall are thought to affect the movement of cellulose-synthesizing enzymes in the cell membrane, which, in turn, affect cell wall growth and shape. 
E) Microtubules of the plant cell nucleus are thought to affect the movement of cellulose-synthesizing enzymes in the cell membrane, which, in turn, affect cell wall growth and shape. 
A) Microtubules of the plant cell cortex are thought to affect the movement of cellulose-synthesizing enzymes in the cell membrane, which, in turn, affect cell wall growth and shape. 
B) Microtubules of the plant cell vacuole are thought to affect the movement of cellulose-synthesizing enzymes in the cell membrane, which, in turn, affect cell wall growth and shape. 
C) Microtubules of the plant cell cortex are thought to affect the movement of lipid-synthesizing enzymes in the cell membrane, which, in turn, affect cell wall growth and shape. 
D) Microtubules of the plant cell wall are thought to affect the movement of cellulose-synthesizing enzymes in the cell membrane, which, in turn, affect cell wall growth and shape. 
E) Microtubules of the plant cell nucleus are thought to affect the movement of cellulose-synthesizing enzymes in the cell membrane, which, in turn, affect cell wall growth and shape.

Question 18

What is the name of the densely staining area between the lightly staining areas at the outer edges of a sarcomere?

Accepted Answer

A) A bands 
B) H zones 
C) I bands 
D) Z lines 
E) M lines 
A) A bands 
B) H zones 
C) I bands 
D) Z lines 
E) M lines

Question 19

A shift in the concentration or activity of which type of proteins can cause a shift in the equilibrium between actin monomers and polymers?

Accepted Answer

A) nucleating proteins 
B) monomer-sequestering proteins 
C) endolysins 
D) capping proteins 
E) all of these choices 
A) nucleating proteins 
B) monomer-sequestering proteins 
C) endolysins 
D) capping proteins 
E) all of these choices

Question 20

Which protein below is often a component of intermediate filaments?

Accepted Answer

A) alpha-tubulin 
B) beta-tubulin 
C) actin 
D) keratin 
E) myosin 
A) alpha-tubulin 
B) beta-tubulin 
C) actin 
D) keratin 
E) myosin

You inject labeled keratin subunits into cultured skin cells. What happens a few minutes later?

What kind of cells seems to rely mostly on microfilaments for long-distance transport of cytoplasmic vesicles and organelles, probably due to restricted microtubule distribution in these cells?

What protein is responsible for intraflagellar transport of IFT trainsback toward the cell body?

Which of the following traits is NOT seen upon close examination of a living growth cone of an elongating axon?

Which region of the sarcomere contains only actin thin filaments or actin filaments?

Along which structure do membranous vesicles and organelles typically engage in local movement in the cell periphery of an animal cell?

Which type of cytoskeletal element is characterized as a hollow, rigid cylindrical tube with walls composed of tubulin subunits?

The microtubule wall is composed of globular proteins arranged in longitudinal rows called _________.

The protein Crescentin (CreS)has been implicated in regulating the shape of some bacterial cells and forms bundled filaments that give bacteria containing it a highly curved shape; it resembles __________ in structure.

Which element of the cytoskeleton is found in the cytoplasm and the nucleus?

The cross-bridges that hold intermediate filaments together are composed of _______.

What part of the molecular motor kinesin is responsible for binding to the cargo to be hauled?

Nucleation of microtubules takes place rapidly inside a cell, where it occurs in association with a variety of specialized structures called _____________.

In a growing plant cell, cellulose microfibrils are oriented _______ the direction of cell growth.

Proteins that accelerate the polymerization of actin filaments are called ________.

What is the name of the largest protein yet discovered? It extends from the M line in the center of the sarcomere along the myosin filament and past the A band to terminate at the Z line.

How are microtubules thought to affect cell shape in plants?

What is the name of the densely staining area between the lightly staining areas at the outer edges of a sarcomere?

A shift in the concentration or activity of which type of proteins can cause a shift in the equilibrium between actin monomers and polymers?

Which protein below is often a component of intermediate filaments?

Introduction to the Study of Cell and Molecular Biology

The Chemical Basis of Life

Bioenergetics, Enzymes and Metabolism

The Structure and Function of the Plasma Membrane

Aerobic Respiration and the Mitochondrion

Photosynthesis and the Chloroplast

Interactions Between Cells and Their Environment

Cytoplasmic Membrane Systems: Structure, Function, and Membrane Trafficking

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 9: The Cytoskeleton and Cell Motility

You inject labeled keratin subunits into cultured skin cells. What happens a few minutes later?

What kind of cells seems to rely mostly on microfilaments for long-distance transport of cytoplasmic vesicles and organelles, probably due to restricted microtubule distribution in these cells?

What protein is responsible for intraflagellar transport of IFT trainsback toward the cell body?

Which of the following traits is NOT seen upon close examination of a living growth cone of an elongating axon?

Which region of the sarcomere contains only actin thin filaments or actin filaments?

Along which structure do membranous vesicles and organelles typically engage in local movement in the cell periphery of an animal cell?

Which type of cytoskeletal element is characterized as a hollow, rigid cylindrical tube with walls composed of tubulin subunits?

The microtubule wall is composed of globular proteins arranged in longitudinal rows called _________.

The protein Crescentin (CreS)has been implicated in regulating the shape of some bacterial cells and forms bundled filaments that give bacteria containing it a highly curved shape; it resembles __________ in structure.

Which element of the cytoskeleton is found in the cytoplasm and the nucleus?

The cross-bridges that hold intermediate filaments together are composed of _______.

What part of the molecular motor kinesin is responsible for binding to the cargo to be hauled?

Nucleation of microtubules takes place rapidly inside a cell, where it occurs in association with a variety of specialized structures called _____________.

In a growing plant cell, cellulose microfibrils are oriented _______ the direction of cell growth.

Proteins that accelerate the polymerization of actin filaments are called ________.

What is the name of the largest protein yet discovered? It extends from the M line in the center of the sarcomere along the myosin filament and past the A band to terminate at the Z line.

How are microtubules thought to affect cell shape in plants?

What is the name of the densely staining area between the lightly staining areas at the outer edges of a sarcomere?

A shift in the concentration or activity of which type of proteins can cause a shift in the equilibrium between actin monomers and polymers?

Which protein below is often a component of intermediate filaments?

Introduction to the Study of Cell and Molecular Biology

The Chemical Basis of Life

Bioenergetics, Enzymes and Metabolism

The Structure and Function of the Plasma Membrane

Aerobic Respiration and the Mitochondrion

Photosynthesis and the Chloroplast

Interactions Between Cells and Their Environment

Cytoplasmic Membrane Systems: Structure, Function, and Membrane Trafficking

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