Question 1

Which of the following best explains why electron microscopes can resolve much smaller structures than light microscopes?

Accepted Answer

Electrons have a much shorter wavelength than visible light, allowing for higher resolution.

Question 2

A scientist wants to observe the 3D surface structure of a virus particle. Which microscopy technique should they use and why?

Accepted Answer

Scanning electron microscopy (SEM), because it provides detailed 3D images of specimen surfaces.

Question 3

Which of the following statements about cell fractionation is correct?

Accepted Answer

Cell fractionation uses a series of increasing centrifuge speeds to separate cell components by size and density.

Question 4

Which of the following is a unique feature of eukaryotic cells compared to prokaryotic cells?

Accepted Answer

Presence of membrane-bound organelles.

Question 5

Why are cells generally small in size? Use the surface area-to-volume ratio in your explanation.

Accepted Answer

Smaller cells have a higher surface area-to-volume ratio, which facilitates efficient exchange of materials with the environment.

Question 6

A mutation prevents the formation of the nuclear lamina in a eukaryotic cell. Which of the following cellular processes would be most directly affected?

Accepted Answer

Maintenance of nuclear shape and structural support.

Question 7

Which of the following best describes the role of the rough endoplasmic reticulum (RER) in protein processing?

Accepted Answer

The RER modifies newly synthesized polypeptides and directs them to their proper cellular destinations.

Question 8

A patient is diagnosed with Tay-Sachs disease, a lysosomal storage disorder. Which cellular process is most directly impaired in this disease?

Accepted Answer

Digestion of specific macromolecules within lysosomes.

Question 9

Which of the following organelles is most directly involved in the detoxification of alcohol in liver cells?

Accepted Answer

Smooth endoplasmic reticulum (SER)

Question 10

According to the endosymbiont theory, which evidence supports the idea that mitochondria and chloroplasts originated from prokaryotic cells?

Accepted Answer

They contain circular DNA and free ribosomes similar to bacteria.

Question 11

Which cytoskeletal element is primarily responsible for the separation of chromosomes during cell division?

Accepted Answer

Microtubules

Question 12

A researcher observes a cell with a large central vacuole, chloroplasts, and a cell wall. Which type of cell is being observed?

Accepted Answer

Plant cell

Question 13

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

Accepted Answer

It facilitates communication between cells and helps regulate cell behavior.

Question 14

Which cell junction would be most important in preventing the leakage of stomach acid between epithelial cells lining the stomach?

Accepted Answer

Tight junctions

Question 15

A mutation disrupts the function of dynein in a cell. Which cellular process would be most directly affected?

Accepted Answer

Beating of cilia and flagella

Question 16

Which of the following best explains why mitochondria are abundant in muscle cells?

Accepted Answer

Muscle cells require large amounts of ATP for contraction, and mitochondria are the site of ATP production through cellular respiration.

Question 17

Which of the following statements about ribosomes is correct?

Accepted Answer

Ribosomes can be free in the cytosol or bound to the endoplasmic reticulum.

Question 18

A cell is observed to have an extensive network of microfilaments just beneath its plasma membrane. What is the most likely function of this arrangement?

Accepted Answer

To maintain cell shape by bearing tension and supporting the cell cortex.

Question 19

Which of the following best describes the role of plasmodesmata in plant cells?

Accepted Answer

They form channels that allow water, ions, and small molecules to pass between adjacent plant cells.

A Tour of the Cell: Structure, Function, and Microscopy

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