Question 1

Which cytoskeletal component is primarily responsible for the movement of chromosomes during mitosis, and what is its main protein subunit?

Accepted Answer

Microtubules; tubulin

Question 2

A scientist observes that a certain cell type can rapidly change its shape and move by crawling along surfaces. Which cytoskeletal element is most directly involved in this process, and what protein does it primarily contain?

Accepted Answer

Microfilaments; actin

Question 3

Which of the following best describes the function of the extracellular matrix (ECM) in animal tissues?

Accepted Answer

It fills space between cells, binds cells together, and provides structural support.

Question 4

A mutation disrupts the formation of collagen in the extracellular matrix. Which tissue function would be most directly affected?

Accepted Answer

Structural support and tissue integrity

Question 5

Which type of intercellular junction would you expect to find in tissues that experience significant stretching, such as muscle tissue?

Accepted Answer

Anchoring junctions (desmosomes)

Question 6

A plant cell is observed to have a rigid outer layer composed primarily of a polysaccharide. Which molecule is this layer made of, and what is its main function?

Accepted Answer

Cellulose; structural support

Question 7

Which of the following best explains why cilia and flagella are able to move?

Accepted Answer

They contain microtubules arranged in a 9+2 pattern, with motor proteins (dynein) causing bending.

Question 8

Which of the following is a key difference between plant and fungal cell walls?

Accepted Answer

Plant cell walls are made of cellulose, while fungal cell walls are made of chitin.

Question 9

A researcher is studying a disease where cells lose their ability to anchor organelles such as the nucleus. Which cytoskeletal element is most likely defective?

Accepted Answer

Intermediate filaments

Question 10

Which of the following best describes the role of integrins in animal cells?

Accepted Answer

They connect the extracellular matrix to the cytoskeleton, transmitting signals.

Question 11

Which of the following scenarios best illustrates the function of tight junctions in animal tissues?

Accepted Answer

Preventing leakage of digestive enzymes between intestinal cells

Question 12

A white blood cell moves toward a site of infection by changing its shape and squeezing between other cells. Which cytoskeletal element is most involved in this process?

Accepted Answer

Microfilaments

Question 13

Which of the following is true regarding the relative thickness of cytoskeletal elements?

Accepted Answer

Microtubules \u003e intermediate filaments \u003e microfilaments

Question 14

Which of the following best describes the function of gap junctions in animal cells?

Accepted Answer

They allow direct communication by permitting ions and small molecules to pass between cells.

Question 15

A cow painted with zebra-like stripes is less likely to be bitten by flies. This is an example of which scientific principle?

Accepted Answer

A real-world application of experimental design and observation

Question 16

Which of the following structures is unique to plant cells and allows for direct communication between adjacent cells?

Accepted Answer

Plasmodesmata

Question 17

If a mutation prevented the disassembly of microtubules, which cellular process would be most directly affected?

Accepted Answer

Chromosome separation during mitosis

Question 18

Which of the following best explains why fungal infections are often difficult to treat without harming human cells?

Accepted Answer

Fungi and humans both use actin in their cytoskeleton.

Question 19

Which cytoskeletal element is most likely to be found as a permanent fixture, reinforcing cell shape and anchoring organelles such as the nucleus?

Accepted Answer

Intermediate filaments

Question 20

Which of the following best describes the arrangement of microtubules in a typical eukaryotic flagellum?

Accepted Answer

A 9+2 arrangement: nine doublets surrounding two central microtubules

A Tour of the Cell: Cytoskeleton, Cell Surfaces, and Connections

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