Question 1

Actin may be cross-linked into antiparallel bundles.

Accepted Answer

A) True 
 B)False

Question 2

The motor protein that moves cargo toward the plus ends of microtubules is _______.

Accepted Answer

The answer of The motor protein that moves cargo toward...

Question 3

A male patient at a medical clinic presents with infertility due to nonmotile sperm and an inability to clear mucous from his respiratory tract. Other tissues are normal. You suspect that these symptoms may be caused by mutant

Accepted Answer

A)  tubulin. 
B)  kinesin. 
C)  dynein. 
D)  tau protein. 
A)  tubulin. 
B)  kinesin. 
C)  dynein. 
D)  tau protein.

Question 4

Intermediate filaments are typically _______ in diameter.

Accepted Answer

A)  5-7 nm 
B)  10-12 nm 
C)  16-22 nm 
D)  24-26 nm 
A)  5-7 nm 
B)  10-12 nm 
C)  16-22 nm 
D)  24-26 nm

Question 5

The microtubule behavior in which individual microtubules alternate between cycles of growth and shrinkage is called

Accepted Answer

A)  an equilibrium state. 
B)  dynamic instability. 
C)  treadmilling. 
D)  recycling. 
A)  an equilibrium state. 
B)  dynamic instability. 
C)  treadmilling. 
D)  recycling.

Question 6

Which of the following microtubules are attached to chromosomes?

Accepted Answer

A)  Astral microtubules 
B)  Interphase microtubules 
C)  Kinetochore microtubules 
D)  Interpolar microtubules 
A)  Astral microtubules 
B)  Interphase microtubules 
C)  Kinetochore microtubules 
D)  Interpolar microtubules

Question 7

Microtubules are approximately 1/3 the diameter of actin filaments.

Accepted Answer

A) True 
 B)False

Question 8

Microtubules are typically _______ in diameter.

Accepted Answer

A)  7 nm 
B)  10-12 nm 
C)  25 nm 
D)  35 nm 
A)  7 nm 
B)  10-12 nm 
C)  25 nm 
D)  35 nm

Question 9

During muscle contraction, the A band

Accepted Answer

A)  stays the same width, and the I bands and H zone shorten. 
B)  and H zone stay the same width, and the I bands shorten. 
C)  shortens, and the I bands and H zone stay the same. 
D)  and H zone shorten, and the I bands stay the same. 
A)  stays the same width, and the I bands and H zone shorten. 
B)  and H zone stay the same width, and the I bands shorten. 
C)  shortens, and the I bands and H zone stay the same. 
D)  and H zone shorten, and the I bands stay the same.

Question 10

Kinesins and dyneins are molecular motor proteins.

Accepted Answer

A) True 
 B)False

Question 11

Which protein can link intermediate filaments with actin filaments and microtubules?

Accepted Answer

A)  $\alpha$-actinin 
B)  $\beta$-catenin 
C)  Integrin 
D)  Plectin 
A)  $\alpha$-actinin 
B)  $\beta$-catenin 
C)  Integrin 
D)  Plectin

Question 12

The phenomenon that illustrates the dynamic behavior of actin filaments and is critical to regulating the structure and function of actin filaments is known as

Accepted Answer

A)  assembly. 
B)  dynamic instability. 
C)  treadmilling. 
D)  disassembly. 
A)  assembly. 
B)  dynamic instability. 
C)  treadmilling. 
D)  disassembly.

Question 13

Expression of a shortened skin keratin gene in place of the normal keratin gene in transgenic mice results in a phenotype in which mice have

Accepted Answer

A)  thick skin. 
B)  no hair. 
C)  fragile, easily blistered skin. 
D)  white hair. 
A)  thick skin. 
B)  no hair. 
C)  fragile, easily blistered skin. 
D)  white hair.

Question 14

Intermediate filaments function in

Accepted Answer

A)  cell motility. 
B)  providing mechanical strength for cells. 
C)  nuclear pore structure. 
D)  All of the above 
A)  cell motility. 
B)  providing mechanical strength for cells. 
C)  nuclear pore structure. 
D)  All of the above

Question 15

The three types of filaments that provide the basis of cell shape and cell motility in eukaryotes are actin filaments, intermediate filaments, and _______.

Accepted Answer

The answer of The three types of filaments that provide...

Question 16

Which cytosolic protein in red blood cells is the link between the plasma membrane and the spectrin/actin network beneath the cell surface?

Accepted Answer

A)  Band 3 
B)  Glycophorin 
C)  Dystrophin 
D)  Ankyrin 
A)  Band 3 
B)  Glycophorin 
C)  Dystrophin 
D)  Ankyrin

Question 17

Duchenne's muscular dystrophy is characterized by

Accepted Answer

A)  X-chromosomal inheritance. 
B)  childhood onset. 
C)  abnormal dystrophin function. 
D)  All of the above 
A)  X-chromosomal inheritance. 
B)  childhood onset. 
C)  abnormal dystrophin function. 
D)  All of the above

Question 18

What MAP is the main component of the lesions found in the brains of Alzheimer's patients?

Accepted Answer

The answer of What MAP is the main component of...

Question 19

The barbed (fast growing) end of actin filaments is located in muscle

Accepted Answer

A)  at the A/I junction. 
B)  near the M line of a contracted sarcomere. 
C)  at the inner margin of the A/I zone. 
D)  at the Z disc. 
A)  at the A/I junction. 
B)  near the M line of a contracted sarcomere. 
C)  at the inner margin of the A/I zone. 
D)  at the Z disc.

Question 20

The cycle of alternating growth and shrinkage of microtubules is referred to as dynamic instability, or rescue and catastrophe.

Accepted Answer

A) True 
 B)False

Actin may be cross-linked into antiparallel bundles.

The motor protein that moves cargo toward the plus ends of microtubules is _______.

A male patient at a medical clinic presents with infertility due to nonmotile sperm and an inability to clear mucous from his respiratory tract. Other tissues are normal. You suspect that these symptoms may be caused by mutant

Intermediate filaments are typically _______ in diameter.

The microtubule behavior in which individual microtubules alternate between cycles of growth and shrinkage is called

Which of the following microtubules are attached to chromosomes?

Microtubules are approximately 1/3 the diameter of actin filaments.

Microtubules are typically _______ in diameter.

During muscle contraction, the A band

Kinesins and dyneins are molecular motor proteins.

Which protein can link intermediate filaments with actin filaments and microtubules?

The phenomenon that illustrates the dynamic behavior of actin filaments and is critical to regulating the structure and function of actin filaments is known as

Expression of a shortened skin keratin gene in place of the normal keratin gene in transgenic mice results in a phenotype in which mice have

Intermediate filaments function in

The three types of filaments that provide the basis of cell shape and cell motility in eukaryotes are actin filaments, intermediate filaments, and _______.

Which cytosolic protein in red blood cells is the link between the plasma membrane and the spectrin/actin network beneath the cell surface?

Duchenne's muscular dystrophy is characterized by

What MAP is the main component of the lesions found in the brains of Alzheimer's patients?

The barbed (fast growing) end of actin filaments is located in muscle

The cycle of alternating growth and shrinkage of microtubules is referred to as dynamic instability, or rescue and catastrophe.

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

Actin may be cross-linked into antiparallel bundles.

The motor protein that moves cargo toward the plus ends of microtubules is _______.

A male patient at a medical clinic presents with infertility due to nonmotile sperm and an inability to clear mucous from his respiratory tract. Other tissues are normal. You suspect that these symptoms may be caused by mutant

Intermediate filaments are typically _______ in diameter.

The microtubule behavior in which individual microtubules alternate between cycles of growth and shrinkage is called

Which of the following microtubules are attached to chromosomes?

Microtubules are approximately 1/3 the diameter of actin filaments.

Microtubules are typically _______ in diameter.

During muscle contraction, the A band

Kinesins and dyneins are molecular motor proteins.

Which protein can link intermediate filaments with actin filaments and microtubules?

The phenomenon that illustrates the dynamic behavior of actin filaments and is critical to regulating the structure and function of actin filaments is known as

Expression of a shortened skin keratin gene in place of the normal keratin gene in transgenic mice results in a phenotype in which mice have

Intermediate filaments function in

The three types of filaments that provide the basis of cell shape and cell motility in eukaryotes are actin filaments, intermediate filaments, and _______.

Which cytosolic protein in red blood cells is the link between the plasma membrane and the spectrin/actin network beneath the cell surface?

Duchenne's muscular dystrophy is characterized by

What MAP is the main component of the lesions found in the brains of Alzheimer's patients?

The barbed (fast growing) end of actin filaments is located in muscle

The cycle of alternating growth and shrinkage of microtubules is referred to as dynamic instability, or rescue and catastrophe.

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