Q: Which of the following equations correctly represents the surface area to volume ratio for a cube-shaped cell?

$$\frac{6 \times (\text{side length})^2$}{(\text{side length})^3$}$$

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 internal structure of mitochondria at very high resolution. Which microscopy technique should she use?

Accepted Answer

Transmission electron microscopy (TEM)

Question 3

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

Accepted Answer

Mitochondrion

Question 4

A mutation prevents the formation of nuclear pore complexes in a eukaryotic cell. Which process would be most directly affected?

Accepted Answer

Transport of mRNA from the nucleus to the cytoplasm

Question 5

Which organelle is primarily responsible for the detoxification of drugs and poisons in liver cells?

Accepted Answer

Smooth endoplasmic reticulum

Question 6

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

Accepted Answer

Plant cell

Question 7

Which of the following statements about mitochondria and chloroplasts supports the endosymbiont theory?

Accepted Answer

Both contain circular DNA and free ribosomes.

Question 8

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

Accepted Answer

Microtubules

Question 9

A patient has a genetic disorder that affects the function of dynein. Which cellular process is most likely to be impaired?

Accepted Answer

Movement of cilia and flagella

Question 10

Which of the following best describes the function of the Golgi apparatus?

Accepted Answer

Modifies, sorts, and packages proteins and lipids for secretion or delivery to other organelles.

Question 11

If a freshwater protist's contractile vacuole stopped functioning, what would most likely happen to the cell?

Accepted Answer

The cell would swell and possibly burst due to water influx.

Question 12

Which of the following is a function of peroxisomes in animal cells?

Accepted Answer

Detoxification of alcohol and breakdown of fatty acids

Question 13

Which cell junction would you expect to find in abundance in tissues that experience intense mechanical stress, such as heart muscle?

Accepted Answer

Desmosomes

Question 14

A mutation disrupts the formation of actin filaments in a cell. Which process would be most directly affected?

Accepted Answer

Amoeboid movement and cytoplasmic streaming

Question 15

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 16

Which of the following equations correctly represents the surface area to volume ratio for a cube-shaped cell?

Accepted Answer

$$\frac{6 	imes (	ext{side length})^2$}{(	ext{side length})^3$}$$

Question 17

Which of the following is a unique feature of plant cells not found in animal cells?

Accepted Answer

Presence of a cell wall composed of cellulose

Question 18

A researcher isolates a pellet rich in ribosomes after cell fractionation. Which centrifugation speed and duration is most likely to have produced this pellet?

Accepted Answer

$$150,000 	imes g$$ for 3 hours

Question 19

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

Accepted Answer

Digestion of macromolecules and recycling of cellular components

Question 20

Which of the following statements about the relationship between structure and function in cells is most accurate?

Accepted Answer

The compartmentalization of eukaryotic cells allows for specialized environments that enable incompatible metabolic processes to occur simultaneously.

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

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