Question 1

Which of the following statements best describes the primary function of microtubules in a dividing animal cell?

Accepted Answer

They form the mitotic spindle, which is essential for chromosome segregation.

Question 2

A researcher treats cells with colchicine. Which of the following cellular processes would be most directly affected?

Accepted Answer

Chromosome movement during mitosis

Question 3

Which cytoskeletal element is most resistant to chemical disruption and provides mechanical strength to tissues such as skin?

Accepted Answer

Intermediate filaments

Question 4

Which of the following best explains the phenomenon of microtubule treadmilling?

Accepted Answer

Subunits are added at the plus end and removed at the minus end, causing the microtubule to appear to move.

Question 5

Which protein is responsible for nucleating microtubule assembly at the centrosome?

Accepted Answer

γ-tubulin

Question 6

A mutation in the gene encoding plectin would most likely disrupt which cellular function?

Accepted Answer

The integration and cross-linking of microtubules, microfilaments, and intermediate filaments

Question 7

Which of the following drugs would most likely inhibit the formation of actin filaments by sequestering actin monomers?

Accepted Answer

Latrunculin A

Question 8

A cell is observed to have a highly organized bundle of actin filaments at its apical surface, increasing its surface area. This structure is most likely:

Accepted Answer

A microvillus

Question 9

Which of the following best describes the polarity of microtubules?

Accepted Answer

The plus end grows faster than the minus end due to the orientation of α- and β-tubulin dimers.

Question 10

Which cytoskeletal element is primarily responsible for the contractile ring during cytokinesis in animal cells?

Accepted Answer

Microfilaments

Question 11

A patient has a genetic defect in keratin. Which tissue would most likely be affected?

Accepted Answer

Epithelial tissue

Question 12

Which of the following statements about actin is correct?

Accepted Answer

Actin monomers bind ATP or ADP and polymerize to form microfilaments.

Question 13

Which of the following best explains why vinblastine is used as a chemotherapy drug?

Accepted Answer

It interferes with microtubule spindle assembly, inhibiting cell division.

Question 14

Which cytoskeletal element is most directly involved in the movement of cilia and flagella?

Accepted Answer

Microtubules

Question 15

Which of the following is a correct match between a cytoskeletal element and its associated protein?

Accepted Answer

Intermediate filaments – keratin

Question 16

A scientist observes that a cell treated with phalloidin has stabilized actin filaments. What is the most likely effect on the cell?

Accepted Answer

The cell will be unable to disassemble actin filaments, affecting cell movement.

Question 17

Which of the following best describes the role of γ-tubulin ring complexes (γ-TuRCs) in the cell?

Accepted Answer

They nucleate the assembly of new microtubules at the centrosome.

Question 18

Which of the following is a unique property of intermediate filaments compared to microtubules and microfilaments?

Accepted Answer

They are the most stable and least soluble cytoskeletal elements.

Question 19

Which of the following best explains why microtubules are considered polar structures?

Accepted Answer

They have different types of tubulin at each end, resulting in distinct plus and minus ends.

Question 20

A cell lacking functional centrosomes would most likely have defects in which process?

Accepted Answer

Organization of the mitotic spindle during cell division

Cytoskeletal Systems: Structure, Function, and Dynamics

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