Question 1

________ proteins share considerable sequence homology with actins and accelerate the polymerization of actin filaments.

Accepted Answer

A) Actin-nucleating 
B) Actin-racemase 
C) Actin-related 
D) Tubulin-related 
E) Actin-rated 
A) Actin-nucleating 
B) Actin-racemase 
C) Actin-related 
D) Tubulin-related 
E) Actin-rated C

Question 2

With which of the following structures are intermediate filaments associated?

Accepted Answer

A) the nuclear envelope in the center of the cell 
B) hemidesmosomes 
C) desmosomes 
D) theneurofilaments of neuronal axons 
E) all of these choices are correct 
A) the nuclear envelope in the center of the cell 
B) hemidesmosomes 
C) desmosomes 
D) theneurofilaments of neuronal axons 
E) all of these choices are correct E

Question 3

What motor is associated with microfilaments?

Accepted Answer

A) myoglobin 
B) kinesin 
C) myosin 
D) dynein 
E) myometrium 
A) myoglobin 
B) kinesin 
C) myosin 
D) dynein 
E) myometrium C

Question 4

Why is myosin V able to take very large steps along a microfilament?

Accepted Answer

A) Its neck is twisted. 
B) Its neck is relatively long. 
C) Its neck is relatively short. 
D) Its tail is very long. 
E) Its tail is bipolar. 
A) Its neck is twisted. 
B) Its neck is relatively long. 
C) Its neck is relatively short. 
D) Its tail is very long. 
E) Its tail is bipolar.

Question 5

What is the direct source of energy that powers molecular motors?

Accepted Answer

A) hydrolysis of GTP 
B) hydrolysis of ATP 
C) aproton gradient 
D) an H+ gradient 
E) condensation of ATP 
A) hydrolysis of GTP 
B) hydrolysis of ATP 
C) aproton gradient 
D) an H+ gradient 
E) condensation of ATP

Question 6

What seems to control the assembly and disassembly of intermediate filaments?

Accepted Answer

A) denaturation 
B) sulfation 
C) phosphorylation and dephosphorylation 
D) hydrolysis 
E) hydroxylation 
A) denaturation 
B) sulfation 
C) phosphorylation and dephosphorylation 
D) hydrolysis 
E) hydroxylation

Question 7

Myofibrils in a muscle cell are made up of a repeating linear array of contractile units called ________.

Accepted Answer

A) sarcocytes 
B) blastomeres 
C) myomeres 
D) sarcomeres 
E) myotubules 
A) sarcocytes 
B) blastomeres 
C) myomeres 
D) sarcomeres 
E) myotubules

Question 8

Left or right handed spiral growth in Arabidopsis has been linked to all of the following proteins EXCEPT:

Accepted Answer

A) α tubulin 
B) β tubulin 
C) plant specific MAPs 
D) actin 
E) all of these proteins have been linked to spiral growth 
A) α tubulin 
B) β tubulin 
C) plant specific MAPs 
D) actin 
E) all of these proteins have been linked to spiral growth

Question 9

Which of the following treatments did not help microtubules to polymerize when homogenates prepared from brain tissue received it?

Accepted Answer

A) Mg2+ ions 
B) GTP 
C) EGTA 
D) a temperature of 37°C 
E) a temperature of 4°C 
A) Mg2+ ions 
B) GTP 
C) EGTA 
D) a temperature of 37°C 
E) a temperature of 4°C

Question 10

Which of the following is most extensible?

Accepted Answer

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

Question 11

The role of building the cytokinetic ring during cell division in prokaryotes is executed by _________.

Accepted Answer

A) actin 
B) tubulin 
C) FtsZ 
D) ParM 
E) Crescentin 
A) actin 
B) tubulin 
C) FtsZ 
D) ParM 
E) Crescentin

Question 12

In a normal microtubule, how many protofilaments make up its cylindrical wall?

Accepted Answer

A) 13 
B) 15 
C) 11 
D) 9 
E) 17 
A) 13 
B) 15 
C) 11 
D) 9 
E) 17

Question 13

The peripheral doublets of the axoneme are connected to one another by a(n)________ composed of an elastic protein-based linkage called the _______.

Accepted Answer

A) intersheath bridge, nexin link 
B) peridoublet sheath, dynein link 
C) interdoublet bridge, nexin link 
D) interdoublet sheath, dynein link 
E) peridoublet sheath, nexin link 
A) intersheath bridge, nexin link 
B) peridoublet sheath, dynein link 
C) interdoublet bridge, nexin link 
D) interdoublet sheath, dynein link 
E) peridoublet sheath, nexin link

Question 14

The central, rod-shaped domain of an intermediate filament is flanked on each side by globular domains of variable size and sequence. What structure forms the core of the central, rod-shaped domain?

Accepted Answer

A) alpha-helix 
B) beta-pleated sheet 
C) double helix 
D) quaternary coil 
E) coiled coil 
A) alpha-helix 
B) beta-pleated sheet 
C) double helix 
D) quaternary coil 
E) coiled coil

Question 15

Which region of the sarcomere represents the region of overlap between the two types of filaments in the sarcomere?

Accepted Answer

A) A bands 
B) the part of the A band on either side of the H zone 
C) I bands 
D) Z lines 
E) the part of the H zone on either side of the A band 
A) A bands 
B) the part of the A band on either side of the H zone 
C) I bands 
D) Z lines 
E) the part of the H zone on either side of the A band

Question 16

Which of the following is normally associated with the cilia of organisms from protists to mammals?

Accepted Answer

A) a 9 + 0 pattern 
B) a 9 + 1 pattern 
C) a 9 + 2 pattern 
D) a 9 + 3 pattern 
E) none of these choices 
A) a 9 + 0 pattern 
B) a 9 + 1 pattern 
C) a 9 + 2 pattern 
D) a 9 + 3 pattern 
E) none of these choices

Question 17

How do muscle cells become multinucleate?

Accepted Answer

A) They become multinucleate as they undergo fission. 
B) They become multinucleate via the embryonic fusion of large numbers of mononucleate myoblasts. 
C) They become multinucleate via the embryonic fusion of large numbers of multinucleate myoblasts. 
D) They become multinucleate via mitosis in myoblasts without cytokinesis. 
E) They become multinucleate via the embryonic fusion of mononucleaateneuroblasts. 
A) They become multinucleate as they undergo fission. 
B) They become multinucleate via the embryonic fusion of large numbers of mononucleate myoblasts. 
C) They become multinucleate via the embryonic fusion of large numbers of multinucleate myoblasts. 
D) They become multinucleate via mitosis in myoblasts without cytokinesis. 
E) They become multinucleate via the embryonic fusion of mononucleaateneuroblasts.

Question 18

What kinds of forces hold microtubular structure together?

Accepted Answer

A) strong interactions 
B) noncovalent interactions 
C) covalent interactions 
D) magnetism 
E) strong interactions and covalent interactions 
A) strong interactions 
B) noncovalent interactions 
C) covalent interactions 
D) magnetism 
E) strong interactions and covalent interactions

Question 19

Using a macrophage‐like cell line, researchers infected one set of petri dishes with wild‐type Listeria, and, as anegative control, infected another set with a Listeria mutant that was unable to enter cells. At specific time points, the cells were fixed and prepared for electron microscopy. Two hours after infection, they observed that the wild‐type Listeria in the cytoplasmwere surrounded by ______________.

Accepted Answer

A) a cloud of tubulin 
B) a cloud of actin 
C) a cloud of keratin 
D) agrowth cone 
E) comet tails of actin filaments 
A) a cloud of tubulin 
B) a cloud of actin 
C) a cloud of keratin 
D) agrowth cone 
E) comet tails of actin filaments

Question 20

It was found that Listeria infection could not be spread from one cell to its neighbors on a petri dish in the presence of cytochalasin. This suggested that ___________.

Accepted Answer

A) actin polymerization is required for Listeria infection 
B) tubulin polymerization is required for Listeria infection 
C) cytochalasin is required for Listeria infection 
D) cytochalasin is toxic 
E) intermediate filaments are required for Listeria infection 
A) actin polymerization is required for Listeria infection 
B) tubulin polymerization is required for Listeria infection 
C) cytochalasin is required for Listeria infection 
D) cytochalasin is toxic 
E) intermediate filaments are required for Listeria infection

________ proteins share considerable sequence homology with actins and accelerate the polymerization of actin filaments.

With which of the following structures are intermediate filaments associated?

What motor is associated with microfilaments?

Why is myosin V able to take very large steps along a microfilament?

What is the direct source of energy that powers molecular motors?

What seems to control the assembly and disassembly of intermediate filaments?

Myofibrils in a muscle cell are made up of a repeating linear array of contractile units called ________.

Left or right handed spiral growth in Arabidopsis has been linked to all of the following proteins EXCEPT:

Which of the following treatments did not help microtubules to polymerize when homogenates prepared from brain tissue received it?

Which of the following is most extensible?

The role of building the cytokinetic ring during cell division in prokaryotes is executed by _________.

In a normal microtubule, how many protofilaments make up its cylindrical wall?

The peripheral doublets of the axoneme are connected to one another by a(n)__ composed of an elastic protein-based linkage called the _.

The central, rod-shaped domain of an intermediate filament is flanked on each side by globular domains of variable size and sequence. What structure forms the core of the central, rod-shaped domain?

Which region of the sarcomere represents the region of overlap between the two types of filaments in the sarcomere?

Which of the following is normally associated with the cilia of organisms from protists to mammals?

How do muscle cells become multinucleate?

What kinds of forces hold microtubular structure together?

It was found that Listeria infection could not be spread from one cell to its neighbors on a petri dish in the presence of cytochalasin. This suggested that ___________.

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

________ proteins share considerable sequence homology with actins and accelerate the polymerization of actin filaments.

With which of the following structures are intermediate filaments associated?

What motor is associated with microfilaments?

Why is myosin V able to take very large steps along a microfilament?

What is the direct source of energy that powers molecular motors?

What seems to control the assembly and disassembly of intermediate filaments?

Myofibrils in a muscle cell are made up of a repeating linear array of contractile units called ________.

Left or right handed spiral growth in Arabidopsis has been linked to all of the following proteins EXCEPT:

Which of the following treatments did not help microtubules to polymerize when homogenates prepared from brain tissue received it?

Which of the following is most extensible?

The role of building the cytokinetic ring during cell division in prokaryotes is executed by _________.

In a normal microtubule, how many protofilaments make up its cylindrical wall?

The peripheral doublets of the axoneme are connected to one another by a(n)________ composed of an elastic protein-based linkage called the _______.

The central, rod-shaped domain of an intermediate filament is flanked on each side by globular domains of variable size and sequence. What structure forms the core of the central, rod-shaped domain?

Which region of the sarcomere represents the region of overlap between the two types of filaments in the sarcomere?

Which of the following is normally associated with the cilia of organisms from protists to mammals?

How do muscle cells become multinucleate?

What kinds of forces hold microtubular structure together?

It was found that Listeria infection could not be spread from one cell to its neighbors on a petri dish in the presence of cytochalasin. This suggested that ___________.

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

The peripheral doublets of the axoneme are connected to one another by a(n)__ composed of an elastic protein-based linkage called the _.