Question 1

How are the plus and minus ends of microtubules arranged in the dendrites of neurons?

Accepted Answer

Microtubules are oriented in b

Question 2

Which statement about cilia is false?

Accepted Answer

A)  They are about 10 micrometers in length, and cells that have them usually have many of them. 
B)  They can be used to move fluids over the cell surface or to move the cell through fluids. 
C)  They are projections of the plasma membrane supported by microfilaments. 
D)  Their movement relies on the motor activity of axonemal dynein. 
A)  They are about 10 micrometers in length, and cells that have them usually have many of them. 
B)  They can be used to move fluids over the cell surface or to move the cell through fluids. 
C)  They are projections of the plasma membrane supported by microfilaments. 
D)  Their movement relies on the motor activity of axonemal dynein.

Question 3

The drug taxol stabilizes microtubules so they cannot shorten. If taxol were added during anaphase of mitosis, what effect would you expect it to have on anaphase movements?

Accepted Answer

A)  It would stop all movements. 
B)  It would stop anaphase A but not anaphase B. 
C)  It would stop anaphase B but not anaphase A. 
D)  It would have no effect. 
A)  It would stop all movements. 
B)  It would stop anaphase A but not anaphase B. 
C)  It would stop anaphase B but not anaphase A. 
D)  It would have no effect.

Question 4

The basal bodies of cilia and flagella are similar in structure to (and can form from)

Accepted Answer

A)  centromeres. 
B)  kinetomeres. 
C)  kinetochores. 
D)  centrioles. 
A)  centromeres. 
B)  kinetomeres. 
C)  kinetochores. 
D)  centrioles.

Question 5

The beating of cilia and flagella occurs by means of _______-based _______.

Accepted Answer

A)  dynein; microtubule sliding 
B)  kinesin; microtubule sliding 
C)  myosin; microfilament sliding 
D)  tubulin; microtubule contraction 
A)  dynein; microtubule sliding 
B)  kinesin; microtubule sliding 
C)  myosin; microfilament sliding 
D)  tubulin; microtubule contraction

Question 6

What is the normal function of dystrophin in muscle cells?

Accepted Answer

To attach actin fila

Question 7

Which of the following does not mediate the association between actin filaments and the plasma membrane?

Accepted Answer

A)  Catenin−cadherin links 
B)  Myosin I−calmodulin links 
C)  Talin−integrin links 
D)  Direct interaction between actin and the plasma membrane 
A)  Catenin−cadherin links 
B)  Myosin I−calmodulin links 
C)  Talin−integrin links 
D)  Direct interaction between actin and the plasma membrane

Question 8

Branching of actin filaments can be initiated by

Accepted Answer

A)  Arp2/3. 
B)  formin. 
C)  ADF/cofilin. 
D)  fimbrin. 
A)  Arp2/3. 
B)  formin. 
C)  ADF/cofilin. 
D)  fimbrin.

Question 9

Kinesins are able to transport _______ along microtubules.

Accepted Answer

A)  membranous vesicles 
B)  endoplasmic reticulum 
C)  mitochondria 
D)  All of the above 
A)  membranous vesicles 
B)  endoplasmic reticulum 
C)  mitochondria 
D)  All of the above

Question 10

Cytoplasmic dynein plays a key role in the positioning of which organelle?

Accepted Answer

A)  Nucleus 
B)  Peroxisome 
C)  Mitochondrion 
D)  Golgi apparatus 
A)  Nucleus 
B)  Peroxisome 
C)  Mitochondrion 
D)  Golgi apparatus

Question 11

Rings of the protein _______ in the pericentriolar material nucleate microtubule assembly.

Accepted Answer

A)  centrin 
B)  pericentrin 
C)  $\alpha$-tubulin 
D)  $\gamma$-tubulin 
A)  centrin 
B)  pericentrin 
C)  $\alpha$-tubulin 
D)  $\gamma$-tubulin

Question 12

Keratin filaments are found in which of the following cell types?

Accepted Answer

A)  Fibroblasts 
B)  Adipocytes 
C)  Muscle cells 
D)  Epithelial cells 
A)  Fibroblasts 
B)  Adipocytes 
C)  Muscle cells 
D)  Epithelial cells

Question 13

Actin filaments are approximately _______ in diameter.

Accepted Answer

A)  5 Å 
B)  7 nm 
C)  11 nm 
D)  25 nm 
A)  5 Å 
B)  7 nm 
C)  11 nm 
D)  25 nm

Question 14

In cell movement, branched actin filament growth pushes against the cell membrane. Proteins involved in this process include all of the following except

Accepted Answer

A)  Arp2/3. 
B)  profilin. 
C)  vinculin. 
D)  WASP proteins. 
A)  Arp2/3. 
B)  profilin. 
C)  vinculin. 
D)  WASP proteins.

Question 15

Which statement about intermediate filaments is true?

Accepted Answer

A)  Rather than consisting of a single type of protein, they can be made up of a number of different proteins. 
B)  They are involved in cell movement. 
C)  The basic structure of an intermediate filament protein is a globular head and a long $\alpha$-helical tail. 
D)  Like microfilaments, they exhibit treadmilling. 
A)  Rather than consisting of a single type of protein, they can be made up of a number of different proteins. 
B)  They are involved in cell movement. 
C)  The basic structure of an intermediate filament protein is a globular head and a long $\alpha$-helical tail. 
D)  Like microfilaments, they exhibit treadmilling.

Question 16

Microtubules are not involved in

Accepted Answer

A)  movement of chromosomes during mitosis. 
B)  transport of membranous vesicles in the cytoplasm. 
C)  cytokinesis of animal cells. 
D)  movement of cilia and flagella. 
A)  movement of chromosomes during mitosis. 
B)  transport of membranous vesicles in the cytoplasm. 
C)  cytokinesis of animal cells. 
D)  movement of cilia and flagella.

Question 17

The complex network of protein filaments and microtubules that extends throughout the cytoplasm is called the _______.

Accepted Answer

The answer of The complex network of protein filaments and...

Question 18

The approximate diameter of an actin filament is

Accepted Answer

A)  7 nm. 
B)  10-12 nm. 
C)  25 nm. 
D)  5 mm. 
A)  7 nm. 
B)  10-12 nm. 
C)  25 nm. 
D)  5 mm.

Question 19

The cargo carried by kinesin along microtubules binds to kinesin on which region?

Accepted Answer

A)  Head 
B)  Neck 
C)  Coiled-coil 
D)  Tail 
A)  Head 
B)  Neck 
C)  Coiled-coil 
D)  Tail

Question 20

Actin filaments are bound into bundles of parallel filaments by the proteins

Accepted Answer

A)  filamin and spectrin. 
B)  troponin and tropomyosin. 
C)  profilin and thymosin. 
D)  $\alpha$-actinin and fimbrin. 
A)  filamin and spectrin. 
B)  troponin and tropomyosin. 
C)  profilin and thymosin. 
D)  $\alpha$-actinin and fimbrin.

How are the plus and minus ends of microtubules arranged in the dendrites of neurons?

Which statement about cilia is false?

The drug taxol stabilizes microtubules so they cannot shorten. If taxol were added during anaphase of mitosis, what effect would you expect it to have on anaphase movements?

The basal bodies of cilia and flagella are similar in structure to (and can form from)

The beating of cilia and flagella occurs by means of _-based _.

What is the normal function of dystrophin in muscle cells?

Which of the following does not mediate the association between actin filaments and the plasma membrane?

Branching of actin filaments can be initiated by

Kinesins are able to transport _______ along microtubules.

Cytoplasmic dynein plays a key role in the positioning of which organelle?

Rings of the protein _______ in the pericentriolar material nucleate microtubule assembly.

Keratin filaments are found in which of the following cell types?

Actin filaments are approximately _______ in diameter.

In cell movement, branched actin filament growth pushes against the cell membrane. Proteins involved in this process include all of the following except

Which statement about intermediate filaments is true?

Microtubules are not involved in

The complex network of protein filaments and microtubules that extends throughout the cytoplasm is called the _______.

The approximate diameter of an actin filament is

The cargo carried by kinesin along microtubules binds to kinesin on which region?

Actin filaments are bound into bundles of parallel filaments by the proteins

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 Plasma Membrane

Cell Walls, the Extracellular Matrix, and Cell Interactions

Cell Signaling

The Cell Cycle

Cell Death and Cell Renewal

Cancer

Filters

Exam 14: The Cytoskeleton and Cell Movement

How are the plus and minus ends of microtubules arranged in the dendrites of neurons?

Which statement about cilia is false?

The drug taxol stabilizes microtubules so they cannot shorten. If taxol were added during anaphase of mitosis, what effect would you expect it to have on anaphase movements?

The basal bodies of cilia and flagella are similar in structure to (and can form from)

The beating of cilia and flagella occurs by means of _______-based _______.

What is the normal function of dystrophin in muscle cells?

Which of the following does not mediate the association between actin filaments and the plasma membrane?

Branching of actin filaments can be initiated by

Kinesins are able to transport _______ along microtubules.

Cytoplasmic dynein plays a key role in the positioning of which organelle?

Rings of the protein _______ in the pericentriolar material nucleate microtubule assembly.

Keratin filaments are found in which of the following cell types?

Actin filaments are approximately _______ in diameter.

In cell movement, branched actin filament growth pushes against the cell membrane. Proteins involved in this process include all of the following except

Which statement about intermediate filaments is true?

Microtubules are not involved in

The complex network of protein filaments and microtubules that extends throughout the cytoplasm is called the _______.

The approximate diameter of an actin filament is

The cargo carried by kinesin along microtubules binds to kinesin on which region?

Actin filaments are bound into bundles of parallel filaments by the proteins

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 Plasma Membrane

Cell Walls, the Extracellular Matrix, and Cell Interactions

Cell Signaling

The Cell Cycle

Cell Death and Cell Renewal

Cancer

Filters

The beating of cilia and flagella occurs by means of _-based _.