Question 1

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 2

The splitting of the cytoplasm of a parent cell into two daughter cells is called ______.

Accepted Answer

A) diakinesis 
B) cytokinesis 
C) mitosis 
D) meiosis 
E) cytomegaly 
A) diakinesis 
B) cytokinesis 
C) mitosis 
D) meiosis 
E) cytomegaly

Question 3

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) all of these choices 
E) minitubules 
A) microfilaments 
B) microtubules 
C) intermediate filaments 
D) all of these choices 
E) minitubules

Question 4

If you were to fix a fish keratocyte and stain it with fluorescent antibodies for myosin II,where would you see the myosin II?

Accepted Answer

A) in the advancing lamellipodium edge 
B) in the rear of the cell 
C) in a band where the rear of the lamellipodium joins the rest of the cell 
D) around the nucleus 
E) surrounding the mitochondria 
A) in the advancing lamellipodium edge 
B) in the rear of the cell 
C) in a band where the rear of the lamellipodium joins the rest of the cell 
D) around the nucleus 
E) surrounding the mitochondria

Question 5

Which of the following molecular motors is known to travel in a retrograde direction along microtubules?

Accepted Answer

A) kinesins 
B) dyneins 
C) myosins 
D) kinesins and myosins 
E) kinesins and dyneins 
A) kinesins 
B) dyneins 
C) myosins 
D) kinesins and myosins 
E) kinesins and dyneins

Question 6

Kinesin movement along a microtubule is said to be highly ________ meaning that it can move considerable distances along an individual microtubule without falling off.

Accepted Answer

A) excessive 
B) processive 
C) depressive 
D) progressive 
E) egressive 
A) excessive 
B) processive 
C) depressive 
D) progressive 
E) egressive

Question 7

What protein is responsible for intraflagellar transport of IFT trains back 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 8

The core of a cilium is called the ________.

Accepted Answer

A) troponeme 
B) dynomeme 
C) cilioneme 
D) axoneme 
E) flagelloneme 
A) troponeme 
B) dynomeme 
C) cilioneme 
D) axoneme 
E) flagelloneme

Question 9

What happens to the Z lines after contraction of the sarcomere?

Accepted Answer

A) The distance between the Z lines does not change. 
B) The distance between the Z lines decreases. 
C) The distance between the Z lines increases. 
D) The Z lines disappear. 
E) The Z lines become curved. 
A) The distance between the Z lines does not change. 
B) The distance between the Z lines decreases. 
C) The distance between the Z lines increases. 
D) The Z lines disappear. 
E) The Z lines become curved.

Question 10

An element of the cytoskeleton is treated with ferritin-labeled antibodies to dynein and visualized in the electron microscope.Ferritin can be seen attached to these elements.What are they? What physical property of the cytoskeletal element would support your conclusion?

Accepted Answer

They are microtubules since dy

Question 11

What would happen if you cultured a frog embryo just after gastrulation in the presence of cytochalasin?

Accepted Answer

A) The cells of the neural plate would elongate more than normal. 
B) The cells of the neural plate would elongate much less than normal or not at all. 
C) The cells of the neural plate elongate normally but do not become constricted as usually happens. 
D) The cells of the neural plate elongate normally but become more constricted than they usually do. 
E) The cells of the neural plate do not elongate and do not become constricted as they usually do. 
A) The cells of the neural plate would elongate more than normal. 
B) The cells of the neural plate would elongate much less than normal or not at all. 
C) The cells of the neural plate elongate normally but do not become constricted as usually happens. 
D) The cells of the neural plate elongate normally but become more constricted than they usually do. 
E) The cells of the neural plate do not elongate and do not become constricted as they usually do.

Question 12

Structures that move from the cell body of a neuron down the axon toward the neuron terminals are said to move in a(n)_________ direction.

Accepted Answer

A) retrograde 
B) anterograde 
C) astronomical 
D) radial 
E) intergrade 
A) retrograde 
B) anterograde 
C) astronomical 
D) radial 
E) intergrade

Question 13

Which of the following appears to be the most extensible?

Accepted Answer

A) intermediate filaments 
B) microtubules 
C) microfilaments 
D) spindle fibers 
E) microtubules and spindle fibers 
A) intermediate filaments 
B) microtubules 
C) microfilaments 
D) spindle fibers 
E) microtubules and spindle fibers

Question 14

What provides the energy that drives sarcomere contraction?

Accepted Answer

A) ATP 
B) ADP 
C) GTP 
D) GDP 
E) none of these choices 
A) ATP 
B) ADP 
C) GTP 
D) GDP 
E) none of these choices

Question 15

Which type of actin-binding protein is known to decrease cytoplasmic viscosity by breaking existing actin filaments into two or more pieces?

Accepted Answer

A) monomer-polymerizing proteins 
B) cross-linking proteins 
C) filament-severing proteins 
D) actin-filament depolymerizing proteins 
E) end-blocking proteins 
A) monomer-polymerizing proteins 
B) cross-linking proteins 
C) filament-severing proteins 
D) actin-filament depolymerizing proteins 
E) end-blocking proteins

Question 16

In what form are proteins and neurotransmitters usually transported down the axon of a nerve cell?

Accepted Answer

A) individually by diffusion 
B) in groups of ten 
C) inside transport vesicles 
D) inside the Golgi complex 
E) tied individually to microtubules 
A) individually by diffusion 
B) in groups of ten 
C) inside transport vesicles 
D) inside the Golgi complex 
E) tied individually to microtubules

Question 17

Treatment of isolated sperm axonemes with 0.6 M NaCl has been shown to remove selectively the outer arms from the A microtubules of the axoneme,leaving the inner arms in place.What would be the most likely effect on the NaCl-treated axoneme when ATP was added to the medium?

Accepted Answer

A) The axoneme would fall apart completely. 
B) The axonemes would beat at about half the rate of the intact axoneme. 
C) The central microtubules would disassemble leaving the rest of the axoneme intact. 
D) The axoneme would be solubilized. 
E) Every element of the axoneme would be permanently cross-linked. 
A) The axoneme would fall apart completely. 
B) The axonemes would beat at about half the rate of the intact axoneme. 
C) The central microtubules would disassemble leaving the rest of the axoneme intact. 
D) The axoneme would be solubilized. 
E) Every element of the axoneme would be permanently cross-linked.

Question 18

What is a major influence in determining the organization and behavior of actin filaments inside cells?

Accepted Answer

A) actinin-binding proteins 
B) tubulin 
C) actin-binding proteins 
D) dynein 
E) actin-binding proteins and dynein 
A) actinin-binding proteins 
B) tubulin 
C) actin-binding proteins 
D) dynein 
E) actin-binding proteins and dynein

Question 19

Which of the following words best describes the structure of an actin filament?

Accepted Answer

A) single actin strand 
B) triple helix 
C) hyperpolar filament 
D) double helix 
E) supercoil 
A) single actin strand 
B) triple helix 
C) hyperpolar filament 
D) double helix 
E) supercoil

Question 20

The _______ link is an elastic protein-based linkage that connects tubulin doublets in cilia and flagellae.The resultant bridges play an important role in ciliary and flagellar movement by limiting the extent that adjacent doublets can slide over one another.The resistance to sliding provided by these bridges causes the axoneme to bend.

Accepted Answer

A) plectin 
B) filamentin 
C) nexin 
D) vimentin 
E) myosin 
A) plectin 
B) filamentin 
C) nexin 
D) vimentin 
E) myosin

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

The splitting of the cytoplasm of a parent cell into two daughter cells is called ______.

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

If you were to fix a fish keratocyte and stain it with fluorescent antibodies for myosin II,where would you see the myosin II?

Which of the following molecular motors is known to travel in a retrograde direction along microtubules?

Kinesin movement along a microtubule is said to be highly ________ meaning that it can move considerable distances along an individual microtubule without falling off.

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

The core of a cilium is called the ________.

What happens to the Z lines after contraction of the sarcomere?

An element of the cytoskeleton is treated with ferritin-labeled antibodies to dynein and visualized in the electron microscope.Ferritin can be seen attached to these elements.What are they? What physical property of the cytoskeletal element would support your conclusion?

What would happen if you cultured a frog embryo just after gastrulation in the presence of cytochalasin?

Structures that move from the cell body of a neuron down the axon toward the neuron terminals are said to move in a(n)_________ direction.

Which of the following appears to be the most extensible?

What provides the energy that drives sarcomere contraction?

Which type of actin-binding protein is known to decrease cytoplasmic viscosity by breaking existing actin filaments into two or more pieces?

In what form are proteins and neurotransmitters usually transported down the axon of a nerve cell?

Treatment of isolated sperm axonemes with 0.6 M NaCl has been shown to remove selectively the outer arms from the A microtubules of the axoneme,leaving the inner arms in place.What would be the most likely effect on the NaCl-treated axoneme when ATP was added to the medium?

What is a major influence in determining the organization and behavior of actin filaments inside cells?

Which of the following words best describes the structure of an actin filament?

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

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Exam 9: The Cytoskeleton and Cell Motility

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

The splitting of the cytoplasm of a parent cell into two daughter cells is called ______.

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

If you were to fix a fish keratocyte and stain it with fluorescent antibodies for myosin II,where would you see the myosin II?

Which of the following molecular motors is known to travel in a retrograde direction along microtubules?

Kinesin movement along a microtubule is said to be highly ________ meaning that it can move considerable distances along an individual microtubule without falling off.

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

The core of a cilium is called the ________.

What happens to the Z lines after contraction of the sarcomere?

An element of the cytoskeleton is treated with ferritin-labeled antibodies to dynein and visualized in the electron microscope.Ferritin can be seen attached to these elements.What are they? What physical property of the cytoskeletal element would support your conclusion?

What would happen if you cultured a frog embryo just after gastrulation in the presence of cytochalasin?

Structures that move from the cell body of a neuron down the axon toward the neuron terminals are said to move in a(n)_________ direction.

Which of the following appears to be the most extensible?

What provides the energy that drives sarcomere contraction?

Which type of actin-binding protein is known to decrease cytoplasmic viscosity by breaking existing actin filaments into two or more pieces?

In what form are proteins and neurotransmitters usually transported down the axon of a nerve cell?

Treatment of isolated sperm axonemes with 0.6 M NaCl has been shown to remove selectively the outer arms from the A microtubules of the axoneme,leaving the inner arms in place.What would be the most likely effect on the NaCl-treated axoneme when ATP was added to the medium?

What is a major influence in determining the organization and behavior of actin filaments inside cells?

Which of the following words best describes the structure of an actin filament?

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

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