BIO 3020 CH 14 –The Skeletal And Cell Movement
QUESTIONS WITH ANSWERS 2023 A+ SUCCESS
assuared
Multiple Choice
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
a. assembly.
b. dynamic instability.
c. treadmilling.
d. disassembly.
Answer: c
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 1. Remembering
Learning Objective: Summarize the dynamics of actin filaments and the roles of actin-
binding proteins.
Actin filaments are stabilized by
a. cofilin.
b. gelsolin.
c. thymosin.
d. tropomyosin.
Answer: d
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 1. Remembering
Learning Objective: Summarize the dynamics of actin filaments and the roles of actin-
binding proteins.
Branching of actin filaments can be initiated by
a. Arp2/3.
b. formin.
c. ADF/cofilin.
d. fimbrin.
Answer: a
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 1. Remembering
Learning Objective: Summarize the dynamics of actin filaments and the roles of actin-
binding proteins.
Actin filaments are bound into bundles of parallel filaments by the proteins
a. filamin and spectrin.
© 2019 Oxford University Press
, BIO 3020 CH 14 –The Skeletal And Cell Movement
QUESTIONS WITH ANSWERS 2023 A+ SUCCESS
assuared
b. troponin and tropomyosin.
c. profilin and thymosin.
d. 𝛼-actinin and fimbrin.
Answer: d
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 1. Remembering
Learning Objective: Summarize the dynamics of actin filaments and the roles of actin-
binding proteins.
Short actin filaments bind to tetramers of which protein to form the cytoskeleton of
erythrocytes?
a. Myosin
b. 𝛼-actinin
c. Spectrin
d. Ankyrin
Answer: c
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 1. Remembering
Learning Objective: Summarize the dynamics of actin filaments and the roles of actin-
binding proteins.
Which movement is not based on actin–myosin interactions?
a. Cell migration (crawling) over surfaces
b. Chromosome movement during anaphase A
c. Cytokinesis of animal cells
d. Phagocytosis
Answer: b
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 2. Understanding
Learning Objective: Summarize the dynamics of actin filaments and the roles of actin-
binding proteins.
In actin filament assembly, the process in which ATP-actin monomers are added to
the barbed end of the filament while ADP-actin monomers are concurrently dissociating
from the pointed end of the filament is referred to as
a. equilibrium.
b. dynamic instability.
c. treadmilling.
d. recycling.
Answer: c
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 1. Remembering
Learning Objective: Summarize the dynamics of actin filaments and the roles of actin-
binding proteins.
Duchenne’s muscular dystrophy is characterized by
© 2019 Oxford University Press
, BIO 3020 CH 14 –The Skeletal And Cell Movement
QUESTIONS WITH ANSWERS 2023 A+ SUCCESS
assuared
a. X-chromosomal inheritance.
b. childhood onset.
c. abnormal dystrophin function.
d. All of the above
Answer: d
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 1. Remembering
Learning Objective: Illustrate the organization of actin filaments underlying the plasma
membrane.
Actin filaments are anchored at junctions called
a. adherens junctions.
b. tight junctions.
c. desmosomes.
d. gap junctions.
Answer: a
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 1. Remembering
Learning Objective: Illustrate the organization of actin filaments underlying the plasma
membrane.
During muscle contraction, the A band
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.
Answer: a
Textbook Reference: Myosin Motors
Bloom’s Category: 2. Understanding
Learning Objective: Explain the molecular basis of muscle contraction.
The barbed (fast growing) end of actin filaments is located in muscle
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.
Answer: d
Textbook Reference: Myosin Motors
Bloom’s Category: 1. Remembering
Learning Objective: Explain the molecular basis of muscle contraction.
Myosin is present in muscle sarcomeres.
a. I
b. II
c. III
d. IV
© 2019 Oxford University Press
QUESTIONS WITH ANSWERS 2023 A+ SUCCESS
assuared
Multiple Choice
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
a. assembly.
b. dynamic instability.
c. treadmilling.
d. disassembly.
Answer: c
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 1. Remembering
Learning Objective: Summarize the dynamics of actin filaments and the roles of actin-
binding proteins.
Actin filaments are stabilized by
a. cofilin.
b. gelsolin.
c. thymosin.
d. tropomyosin.
Answer: d
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 1. Remembering
Learning Objective: Summarize the dynamics of actin filaments and the roles of actin-
binding proteins.
Branching of actin filaments can be initiated by
a. Arp2/3.
b. formin.
c. ADF/cofilin.
d. fimbrin.
Answer: a
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 1. Remembering
Learning Objective: Summarize the dynamics of actin filaments and the roles of actin-
binding proteins.
Actin filaments are bound into bundles of parallel filaments by the proteins
a. filamin and spectrin.
© 2019 Oxford University Press
, BIO 3020 CH 14 –The Skeletal And Cell Movement
QUESTIONS WITH ANSWERS 2023 A+ SUCCESS
assuared
b. troponin and tropomyosin.
c. profilin and thymosin.
d. 𝛼-actinin and fimbrin.
Answer: d
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 1. Remembering
Learning Objective: Summarize the dynamics of actin filaments and the roles of actin-
binding proteins.
Short actin filaments bind to tetramers of which protein to form the cytoskeleton of
erythrocytes?
a. Myosin
b. 𝛼-actinin
c. Spectrin
d. Ankyrin
Answer: c
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 1. Remembering
Learning Objective: Summarize the dynamics of actin filaments and the roles of actin-
binding proteins.
Which movement is not based on actin–myosin interactions?
a. Cell migration (crawling) over surfaces
b. Chromosome movement during anaphase A
c. Cytokinesis of animal cells
d. Phagocytosis
Answer: b
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 2. Understanding
Learning Objective: Summarize the dynamics of actin filaments and the roles of actin-
binding proteins.
In actin filament assembly, the process in which ATP-actin monomers are added to
the barbed end of the filament while ADP-actin monomers are concurrently dissociating
from the pointed end of the filament is referred to as
a. equilibrium.
b. dynamic instability.
c. treadmilling.
d. recycling.
Answer: c
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 1. Remembering
Learning Objective: Summarize the dynamics of actin filaments and the roles of actin-
binding proteins.
Duchenne’s muscular dystrophy is characterized by
© 2019 Oxford University Press
, BIO 3020 CH 14 –The Skeletal And Cell Movement
QUESTIONS WITH ANSWERS 2023 A+ SUCCESS
assuared
a. X-chromosomal inheritance.
b. childhood onset.
c. abnormal dystrophin function.
d. All of the above
Answer: d
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 1. Remembering
Learning Objective: Illustrate the organization of actin filaments underlying the plasma
membrane.
Actin filaments are anchored at junctions called
a. adherens junctions.
b. tight junctions.
c. desmosomes.
d. gap junctions.
Answer: a
Textbook Reference: Structure and Organization of Actin Filaments
Bloom’s Category: 1. Remembering
Learning Objective: Illustrate the organization of actin filaments underlying the plasma
membrane.
During muscle contraction, the A band
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.
Answer: a
Textbook Reference: Myosin Motors
Bloom’s Category: 2. Understanding
Learning Objective: Explain the molecular basis of muscle contraction.
The barbed (fast growing) end of actin filaments is located in muscle
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.
Answer: d
Textbook Reference: Myosin Motors
Bloom’s Category: 1. Remembering
Learning Objective: Explain the molecular basis of muscle contraction.
Myosin is present in muscle sarcomeres.
a. I
b. II
c. III
d. IV
© 2019 Oxford University Press
