Question 1

Which of the following best explains why eukaryotic cells can carry out more complex functions than prokaryotic cells?

Accepted Answer

Eukaryotic cells contain internal membranes that compartmentalize cellular functions.

Question 2

A scientist uses centrifugation to separate cellular components. Which organelle would be found in the pellet after spinning at the highest speed, and why?

Accepted Answer

Ribosomes, because they are the smallest and require the highest speed to pellet.

Question 3

Which of the following equations correctly represents the relationship between surface area ($$A) $$and volume ($$V) $$for a spherical cell of radius $$r$$?

Accepted Answer

$$A = 4\pi r^2$, V$$ = \frac{4}{3}\pi $$r^3$$

Question 4

Which structure is responsible for synthesizing proteins that are exported from the cell?

Accepted Answer

Ribosomes bound to rough endoplasmic reticulum

Question 5

A mutation prevents the formation of microtubules in a cell. Which process would be most directly affected?

Accepted Answer

Chromosome separation during cell division

Question 6

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

Accepted Answer

It modifies, sorts, and packages proteins for secretion or delivery to other organelles.

Question 7

Which of the following is a key difference between plant cell walls and the extracellular matrix (ECM) of animal cells?

Accepted Answer

Plant cell walls are composed mainly of cellulose, while the ECM is rich in glycoproteins.

Question 8

A cell is observed to have abundant smooth endoplasmic reticulum. Which function is this cell most likely specialized for?

Accepted Answer

Lipid synthesis and detoxification

Question 9

Which of the following cell junctions would you expect to find in tissues that experience intense mechanical stress, such as heart muscle?

Accepted Answer

Desmosomes

Question 10

A white blood cell engulfs a bacterium. Which organelle is responsible for digesting the bacterium, and what is the main enzyme type involved?

Accepted Answer

Lysosome; hydrolytic enzymes

Question 11

Which of the following best describes the role of motor proteins in the cell?

Accepted Answer

They move vesicles and organelles along cytoskeletal fibers using energy from ATP hydrolysis.

Question 12

Which of the following is a function of the mitochondrion?

Accepted Answer

Cellular respiration and ATP production

Question 13

If a mutation disrupts the formation of intermediate filaments, which cellular function would be most affected?

Accepted Answer

Fixation of organelles and maintenance of cell shape

Question 14

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

Accepted Answer

Small cells have a larger surface area-to-volume ratio, facilitating efficient exchange of materials.

Question 15

Which of the following structures is found in plant cells but not in animal cells?

Accepted Answer

Chloroplasts

Question 16

A patient has a genetic disorder that prevents the formation of gap junctions. Which of the following symptoms would most likely result?

Accepted Answer

Impaired communication between adjacent animal cells

Question 17

Which of the following best describes the function of peroxisomes?

Accepted Answer

They break down fatty acids and detoxify harmful substances.

Question 18

Which of the following is a direct consequence of the compartmentalization of eukaryotic cells?

Accepted Answer

Enzymatic reactions can occur in specialized environments, increasing efficiency.

Question 19

Which of the following best describes the role of the nucleus when a cell ingests a bacterium?

Accepted Answer

The nucleus directs the synthesis of enzymes needed to digest the bacterium.

Question 20

Which of the following statements about the endomembrane system is correct?

Accepted Answer

It includes the nuclear envelope, endoplasmic reticulum, Golgi apparatus, lysosomes, and vesicles.

A Tour of the Cell: Structure and Function of Eukaryotic Cells

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