Question 1

Which of the following best explains why cells are typically small in size?

Accepted Answer

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

Question 2

A scientist wants to study the detailed internal structure of mitochondria. Which type of microscope should they use and why?

Accepted Answer

Transmission electron microscope (TEM), because it allows visualization of internal cell structures at high resolution.

Question 3

Which of the following is NOT a component of the endomembrane system?

Accepted Answer

Mitochondrion

Question 4

During phagocytosis, which sequence of events correctly describes how a cell digests a bacterium?

Accepted Answer

The cell engulfs the bacterium, forms a food vacuole, and then fuses the vacuole with a lysosome for digestion.

Question 5

Which of the following statements about the endosymbiotic theory is correct?

Accepted Answer

It proposes that mitochondria and chloroplasts originated from prokaryotic cells engulfed by an ancestral eukaryote.

Question 6

Which feature is shared by both mitochondria and chloroplasts, supporting the endosymbiotic theory?

Accepted Answer

They both contain circular DNA and free ribosomes.

Question 7

A mutation disrupts the function of the rough endoplasmic reticulum in a cell. Which process would be most directly affected?

Accepted Answer

Synthesis of secretory proteins

Question 8

Which of the following best describes the function of peroxisomes in animal cells?

Accepted Answer

They use oxygen to break down fatty acids and detoxify harmful substances, producing hydrogen peroxide.

Question 9

Which of the following correctly matches a cytoskeletal element with its function?

Accepted Answer

Microtubules: chromosome movement during cell division

Question 10

A plant cell is placed in a hypotonic solution. Which structure prevents the cell from bursting?

Accepted Answer

Cell wall

Question 11

Which of the following cell junctions allows for the direct passage of ions and small molecules between adjacent animal cells?

Accepted Answer

Gap junctions

Question 12

Which of the following is a function of the Golgi apparatus?

Accepted Answer

Modifying, sorting, and packaging proteins for secretion

Question 13

A researcher isolates a cell with the following features: no nucleus, circular DNA, and ribosomes. Which type of cell is this most likely to be?

Accepted Answer

Prokaryotic cell

Question 14

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

Accepted Answer

It provides structural support and mediates communication between cells.

Question 15

Which of the following statements about ribosomes is correct?

Accepted Answer

Ribosomes are the sites of protein synthesis and can be found free in the cytosol or bound to the endoplasmic reticulum.

Question 16

A mutation causes a plant cell to lack plasmodesmata. Which process would be most directly affected?

Accepted Answer

Movement of water and small solutes between adjacent plant cells

Question 17

Which of the following best explains why the inner membrane of mitochondria is highly folded into cristae?

Accepted Answer

To increase the surface area for ATP-producing reactions

Question 18

Which of the following is a correct sequence of structures through which a newly synthesized secretory protein passes before being released from a eukaryotic cell?

Accepted Answer

Rough ER → Golgi apparatus → transport vesicle → plasma membrane

Question 19

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

Accepted Answer

They prevent leakage of extracellular fluid between neighboring cells.

Question 20

A cell is observed to have a large central vacuole, chloroplasts, and a cell wall. Which type of cell is this?

Accepted Answer

Plant cell

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

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