Question 1

What is the banding pattern observed in muscle cells?

Accepted Answer

Dark and light bands repeat and are call

Question 2

Which of the following is a proteolytic fragment of muscle myosin?

Accepted Answer

A)  heavy chain 
B)  S1 
C)  P-loop NTPase 
D)  EF-hand domain 
E)  $\alpha$-meromyosin 
A)  heavy chain 
B)  S1 
C)  P-loop NTPase 
D)  EF-hand domain 
E)  $\alpha$-meromyosin

Question 3

Which of the following is a prokaryotic protein similar to tubulin?

Accepted Answer

A)  troponin 
B)  tubulin 
C)  axoneme 
D)  flagellin 
E)  FtsZ 
A)  troponin 
B)  tubulin 
C)  axoneme 
D)  flagellin 
E)  FtsZ

Question 4

Bacterial flagella rotate in one direction for smooth swimming and in the other direction to cause _______________.

Accepted Answer

The answer of Bacterial flagella rotate in one direction for...

Question 5

Which of the following is a bundle of nine microtubule pairs surrounding two singlet microtubules?

Accepted Answer

A)  axoneme 
B)  dynein 
C)  Arp-actin 
D)  tropomyosin 
E)  None of the answers is correct. 
A)  axoneme 
B)  dynein 
C)  Arp-actin 
D)  tropomyosin 
E)  None of the answers is correct.

Question 6

What are flagella used for in bacteria?

Accepted Answer

A)  chemostasis 
B)  chemoselection 
C)  chemokinesis 
D)  chemotaxis 
E)  chemoprotection 
A)  chemostasis 
B)  chemoselection 
C)  chemokinesis 
D)  chemotaxis 
E)  chemoprotection

Question 7

Describe the experiment that supports the proposed role of the lever arm in myosin motor activity.

Accepted Answer

Investigators deleted sequences to short

Question 8

What serves as the track for myosin?

Accepted Answer

F-actin, actin in it

Question 9

How does the length of the lever arm affect the rate?

Accepted Answer

A)  A mutated shorter arm has a reduced rate. 
B)  A mutated longer arm has a reduced rate. 
C)  A mutated longer arm has a faster rate. 
D)  A and B are correct. 
E)  A and C are correct. 
A)  A mutated shorter arm has a reduced rate. 
B)  A mutated longer arm has a reduced rate. 
C)  A mutated longer arm has a faster rate. 
D)  A and B are correct. 
E)  A and C are correct.

Question 10

What is the functional unit of a muscle cell?

Accepted Answer

A)  myosin 
B)  actin 
C)  mitochondria 
D)  sarcomere 
E)  None of the answers is correct. 
A)  myosin 
B)  actin 
C)  mitochondria 
D)  sarcomere 
E)  None of the answers is correct.

Question 11

A helical section of myosin that moves dramatically when NTP is bound is called the ________.

Accepted Answer

The answer of A helical section of myosin that moves...

Question 12

What is the "biased random walk" movement of bacteria, and when do they engage in this type of movement?

Accepted Answer

In the presence of a gradient of a chemo

Question 13

Troponin reacts in response to the _______________ ion.

Accepted Answer

The answer of Troponin reacts in response to the _______________...

Question 14

What part of kinesin undergoes conformational change after nucleotide binding?

Accepted Answer

A)  head domain 
B)  light chain 
C)  $\alpha$-helical lever arm 
D)  switch II 
E)  neck linker 
A)  head domain 
B)  light chain 
C)  $\alpha$-helical lever arm 
D)  switch II 
E)  neck linker

Question 15

What was learned using the optical trap laser studies?

Accepted Answer

The studies indicated that myosin heads

Question 16

The structure of dynein lends itself to the formation of

Accepted Answer

A)  monomeric proteins. 
B)  dimers. 
C)  oligomers. 
D)  dynein fibers. 
E)  None of the answers is correct. 
A)  monomeric proteins. 
B)  dimers. 
C)  oligomers. 
D)  dynein fibers. 
E)  None of the answers is correct.

Question 17

How is a bacterial motor similar to ATP synthase?

Accepted Answer

In both cases, a pro

Question 18

Molecules that cause bacteria to swim away from toxic substances are

Accepted Answer

A)  cheomoattractants. 
B)  chemotaxis. 
C)  chemorepellants. 
D)  hormones 
E)  None of the answers is correct. 
A)  cheomoattractants. 
B)  chemotaxis. 
C)  chemorepellants. 
D)  hormones 
E)  None of the answers is correct.

Question 19

Actin polymers will assemble

Accepted Answer

A)  automatically by self-assembly. 
B)  only in the presence of myosin. 
C)  with the aid of chaperone proteins. 
D)  in the presence of GTP 
E)  None of the answers is correct. 
A)  automatically by self-assembly. 
B)  only in the presence of myosin. 
C)  with the aid of chaperone proteins. 
D)  in the presence of GTP 
E)  None of the answers is correct.

Question 20

Binding of ATP causes ______________.

Accepted Answer

A)  a decrease in kinesin affinity for microtubules 
B)  an increase in kinesin affinity for microtubules 
C)  no change in kinesin affinity for microtubules 
D)  cross-linking of kinesin to microtubules 
E)  kinesin to completely dissociate from microtubules 
A)  a decrease in kinesin affinity for microtubules 
B)  an increase in kinesin affinity for microtubules 
C)  no change in kinesin affinity for microtubules 
D)  cross-linking of kinesin to microtubules 
E)  kinesin to completely dissociate from microtubules

Exam 35: Molecular Motors

What is the banding pattern observed in muscle cells?

Which of the following is a proteolytic fragment of muscle myosin?

Which of the following is a prokaryotic protein similar to tubulin?

Bacterial flagella rotate in one direction for smooth swimming and in the other direction to cause _______________.

Which of the following is a bundle of nine microtubule pairs surrounding two singlet microtubules?

What are flagella used for in bacteria?

Describe the experiment that supports the proposed role of the lever arm in myosin motor activity.

What serves as the track for myosin?

How does the length of the lever arm affect the rate?

What is the functional unit of a muscle cell?

A helical section of myosin that moves dramatically when NTP is bound is called the ________.

What is the "biased random walk" movement of bacteria, and when do they engage in this type of movement?

Troponin reacts in response to the _______________ ion.

What part of kinesin undergoes conformational change after nucleotide binding?

What was learned using the optical trap laser studies?

The structure of dynein lends itself to the formation of

How is a bacterial motor similar to ATP synthase?

Molecules that cause bacteria to swim away from toxic substances are

Actin polymers will assemble

Binding of ATP causes ______________.

Biochemistry: an Evolving Science

Protein Composition and Structure

Exploring Proteins and Proteomes

DNA, RNA, and the Flow of Genetic Information

Exploring Genes and Genomes

Exploring Evolution and Bioinformatics

Hemoglobin: a Portrait of a Protein in Action

Enzymes: Basic Concepts and Kinetics

Oxidative Phosphorylation

Catalytic Strategies

Regulatory Strategies

Carbohydrates

Lipids and Cell Membranes

Membrane Channels and Pumps

Signal-Transduction Pathways

Metabolism: Basic Concepts and Design

Glycolysis and Gluconeogenesis

The Citric Acid Cycle

The Light Reactions of Photosynthesis

The Calvin Cycle and the Pentose Phosphate Pathway

Glycogen Metabolism

Fatty Acid Metabolism

Protein Turnover and Amino Acid Catabolism

The Biosynthesis of Amino Acids

Nucleotide Biosynthesis

Biosynthesis of Membrane Lipids and Steroids

The Integration of Metabolism

DNA Replication, Repair, and Recombination

Rna Synthesis and Processing

Protein Synthesis

The Control of Gene Expression in Prokaryotes

The Control of Gene Expression in Eukaryotes

Sensory Systems

The Immune System

Drug Development

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