Question 1

If there is no flow of extraembryonic fluid over a mouse embryo,___________.

Accepted Answer

A) most of the embryos die early in development 
B) the majority of embryos still orient correctly 
C) the left-right asymmetry decision for the embryo is made at random 
D) the majority of embryos exhibit situs inversus 
E) the embryos exhibit no asymmetrical arrangement of organs 
A) most of the embryos die early in development 
B) the majority of embryos still orient correctly 
C) the left-right asymmetry decision for the embryo is made at random 
D) the majority of embryos exhibit situs inversus 
E) the embryos exhibit no asymmetrical arrangement of organs

Question 2

What chemical below is known to bind to free actin monomers and block their incorporation into the polymer?

Accepted Answer

A) cytochalasins 
B) nocodazole 
C) phalloidin 
D) latrunculin 
E) phalloidin and latrunculin 
A) cytochalasins 
B) nocodazole 
C) phalloidin 
D) latrunculin 
E) phalloidin and latrunculin

Question 3

The tip,or __________,of an elongating axon resembles a highly motile,crawling fibroblast,unlike the bulk of the axon that shows little outward evidence of motile activity.

Accepted Answer

A) pointiliac 
B) elongation cone 
C) lamellipodial extension 
D) growth cone 
E) growth extension 
A) pointiliac 
B) elongation cone 
C) lamellipodial extension 
D) growth cone 
E) growth extension

Question 4

A culture of Dictyostelium slime mold is prepared in which the myosin II gene is deleted.In which activity or activities below are these cells unable to participate?

Accepted Answer

A) separation of chromosomes during mitosis 
B) cell elongation 
C) cytokinesis 
D) separation of chromosomes during mitosis and cell elongation 
E) separation of chromosomes during mitosis and cytokinesis 
A) separation of chromosomes during mitosis 
B) cell elongation 
C) cytokinesis 
D) separation of chromosomes during mitosis and cell elongation 
E) separation of chromosomes during mitosis and cytokinesis

Question 5

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 6

From where does the energy to run myosin motors come?

Accepted Answer

A) GTP 
B) ATP 
C) proton gradient 
D) CTP 
E) creatine phosphate 
A) GTP 
B) ATP 
C) proton gradient 
D) CTP 
E) creatine phosphate

Question 7

For a long time,it was thought that cilia were unimportant or _________,despite their presence on almost all cells.This idea arose because the cilia on most cells are non‐motile,and it was assumed that motility was the key function of cilia.

Accepted Answer

A) flagellar 
B) execrable 
C) ciliopathic 
D) vestigial 
E) vestibular 
A) flagellar 
B) execrable 
C) ciliopathic 
D) vestigial 
E) vestibular

Question 8

EDTA is a chemical that binds to and removes (chelates)divalent cations from solution.Treatment of isolated axonemes with EDTA leads to the removal of the inner and outer arms extending from the A microtubules of the axoneme.Which of the following statements wouls appear to be true based on this information?

Accepted Answer

A) Potassium ions are required for dynein to bind to the A tubules of the axoneme. 
B) Chlorine ions are required for dynein to bind to the A tubules of the axoneme. 
C) Magnesium ions are required for dynein to bind to the A tubules of the axoneme. 
D) Magnesium ions are required for tubulin to bind to the A tubules of the axoneme. 
E) Sodium ions are required for tubulin to bind to the A tubules of the axoneme. 
A) Potassium ions are required for dynein to bind to the A tubules of the axoneme. 
B) Chlorine ions are required for dynein to bind to the A tubules of the axoneme. 
C) Magnesium ions are required for dynein to bind to the A tubules of the axoneme. 
D) Magnesium ions are required for tubulin to bind to the A tubules of the axoneme. 
E) Sodium ions are required for tubulin to bind to the A tubules of the axoneme.

Question 9

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 10

To which end of microtubules are tubulin subunits primarily added in vitro?

Accepted Answer

A) the minus end 
B) the N-terminal end 
C) the plus end 
D) the C-terminal end 
E) the 5'-end 
A) the minus end 
B) the N-terminal end 
C) the plus end 
D) the C-terminal end 
E) the 5'-end

Question 11

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

Accepted Answer

A) identically to 
B) perpendicular to 
C) parallel to 
D) diagonal to 
E) horizontal to 
A) identically to 
B) perpendicular to 
C) parallel to 
D) diagonal to 
E) horizontal to

Question 12

What is the minimum number of kinesin heads in contact with a microtubule at all times?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
E) 4 
A) 0 
B) 1 
C) 2 
D) 3 
E) 4

Question 13

In cell biology and with respect to microtubules,intermediate filaments,and microfilaments,the word "dynamic" means ________.

Accepted Answer

A) impressive 
B) constant 
C) ever-changing 
D) energetic 
E) forceful 
A) impressive 
B) constant 
C) ever-changing 
D) energetic 
E) forceful

Question 14

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

Question 15

Which of the following treatments does not disassemble microtubules in living cells?

Accepted Answer

A) slightly elevated temperature 
B) hydrostatic pressure 
C) elevated Ca2+ ion concentration 
D) colchicine or vinblastine treatment 
E) all of these choices disassemble microtubules in living cells 
A) slightly elevated temperature 
B) hydrostatic pressure 
C) elevated Ca2+ ion concentration 
D) colchicine or vinblastine treatment 
E) all of these choices disassemble microtubules in living cells

Question 16

What blocks the myosin-binding sites on actin thin filaments in a stimulated sarcomere?

Accepted Answer

A) troponin 
B) myosin itself 
C) tropomyosin 
D) titin 
E) nothing 
A) troponin 
B) myosin itself 
C) tropomyosin 
D) titin 
E) nothing

If there is no flow of extraembryonic fluid over a mouse embryo,___________.

What chemical below is known to bind to free actin monomers and block their incorporation into the polymer?

The tip,or __________,of an elongating axon resembles a highly motile,crawling fibroblast,unlike the bulk of the axon that shows little outward evidence of motile activity.

A culture of Dictyostelium slime mold is prepared in which the myosin II gene is deleted.In which activity or activities below are these cells unable to participate?

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.

From where does the energy to run myosin motors come?

For a long time,it was thought that cilia were unimportant or _________,despite their presence on almost all cells.This idea arose because the cilia on most cells are non‐motile,and it was assumed that motility was the key function of cilia.

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

To which end of microtubules are tubulin subunits primarily added in vitro?

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

What is the minimum number of kinesin heads in contact with a microtubule at all times?

In cell biology and with respect to microtubules,intermediate filaments,and microfilaments,the word "dynamic" means ________.

Which protein below is often a component of intermediate filaments?

Which of the following treatments does not disassemble microtubules in living cells?

What blocks the myosin-binding sites on actin thin filaments in a stimulated sarcomere?

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

If there is no flow of extraembryonic fluid over a mouse embryo,___________.

What chemical below is known to bind to free actin monomers and block their incorporation into the polymer?

The tip,or __________,of an elongating axon resembles a highly motile,crawling fibroblast,unlike the bulk of the axon that shows little outward evidence of motile activity.

A culture of Dictyostelium slime mold is prepared in which the myosin II gene is deleted.In which activity or activities below are these cells unable to participate?

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.

From where does the energy to run myosin motors come?

For a long time,it was thought that cilia were unimportant or _________,despite their presence on almost all cells.This idea arose because the cilia on most cells are non‐motile,and it was assumed that motility was the key function of cilia.

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

To which end of microtubules are tubulin subunits primarily added in vitro?

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

What is the minimum number of kinesin heads in contact with a microtubule at all times?

In cell biology and with respect to microtubules,intermediate filaments,and microfilaments,the word "dynamic" means ________.

Which protein below is often a component of intermediate filaments?

Which of the following treatments does not disassemble microtubules in living cells?

What blocks the myosin-binding sites on actin thin filaments in a stimulated sarcomere?

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