Concept: Intermediate Filaments


Concept: Microtubules and Motor Proteins


Concept: Cilia and Flagella


Concept: Microfilaments


Problem: Cytoskeleton functions include all of the following EXCEPT:


Problem: The cytoskeleton is a static structure, once built it doesn’t change.


Problem: What component of the cytoskeletons do motor proteins use to transport vesicles?


Problem: Bacteria have flagella and cilia, but eukaryotes only have cilia


Cytoskeleton Additional Practice Problems

Which cytoskeletal elements are not found in the cytoplasm ofcells in arthropods like crabs?

A. Actin filaments

B. Intermediate filaments

C. Microtubules

D. Actin filaments and microtubules

E. Actin filaments, intermediate filaments, and microtubules

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Which cytoskeletal component is particularly enriched in the shaft of a growing axon?

A. microtubules

B. actin

C. growth cones


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Which of the following statements about the cytoskeleton is true?

A. Microfilaments are structurally rigid and resist compression, whereas microtubules resist tension (stretching).

B. Movement of cilia and flagella is the result of motor proteins causing microtubules to move relative to each other.

C. Transport vesicles among the membranes of the endomembrane system produce the cytoskeleton.

D. The dynamic aspect of cytoskeletal function is made possible by the assembly and disassembly of a large variety of proteins into complex aggregates.

E. Chemicals that block the assembly of the cytoskeleton would cause little effect on the cell's response to external signals and stimuli.

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 Compare and contrast actin and tubulin polymerization. 

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What is the structure of cilia and flagella?

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Which cytoskeleton provide strong support? What is the names of cytoskeleton in nail formation and staging sarcoma cancer?

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What are three ways in which cilia play a role in cell function? You may consider examples in our own bodies, or in other organisms.

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How do microtubules and actin microfilaments assemble from their subunits in a way that gives them polarity? 

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Intermediate filaments are an essential class of cytoskeletal proteins. Give two examples of how they are different from the other cytoskeletal systems, i.e., microtubules and actin. (The best answer will include some details about the other cytoskeletal elements, e.g., composition, proteins that bind actin/tubulin, etc.) 

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Scientific evidence is beginning to suggest that some elements of the cytoskeleton may have originated in bacteria. 

a. True

b. False

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The cytoskeleton consists of microtubules, microfilaments, and intermediate filaments. 

a. True

b. False

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What is the role of actin in eukaryotic cells? 

a. It is part of the cytoskeleton

b. It forms the spindle that pulls chromosomes apart

c. It forms the centromere that holds sister chromatids together

d. It is necessary for the DNA to replicate

e. It is necessary for the nucleosome to form in condensing chromosomes

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How do sperm move to fertilize eggs?

a. With flagella made of microtubules

b. By diffusion

c. With flagella made of actin

d. With cilia made of microtubules

e. With cilia made of actin

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Flagella are not: 

a. Found on eukaryotic cells

b. Found on prokaryotic cells

c. Used for movement

d. Composed of microtubules

e. Short appendages

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Cilia are not: 

a. Found on prokaryotic cells

b. Found on eukaryotic cells

c. Used for movement

d. Short appendages

e. Composed of microtubules

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A cytoskeleton is: 

a. A structure that aids in the process of cell division

b. Found in the cytoplasm of eukaryotic cells

c. A system of tracks used for transport

d. Composed of microtubules and microfilaments

e. All are correct

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All of the following about flagella of bacteria are true except

a. they are used in locomotion

b. they are used in feeding

c. they have similar function as mitochondria of eukaryotic cells

d. there may be more than one per cell


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Prokaryotic cell movement is attributed to the

a. capsule

b. ribosomes

c. nucleoid area

d. flagella 

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