Question 1

Which of the following statements best explains why eukaryotic cells are able to compartmentalize their functions more efficiently than prokaryotic cells?

Accepted Answer

Eukaryotic cells possess internal membranes that create distinct organelles for specialized functions.

Question 2

A scientist discovers a cell with the following characteristics: circular DNA, free ribosomes, and no membrane-bound organelles. Which domain of life does this cell most likely belong to?

Accepted Answer

Bacteria

Question 3

Which organelle is primarily responsible for synthesizing lipids and detoxifying drugs in liver cells?

Accepted Answer

Smooth endoplasmic reticulum

Question 4

During cellular respiration, mitochondria convert energy using the following overall chemical equation. Which molecule is the primary energy currency produced?

$$ \mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} ightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + 	ext{energy} $$

Accepted Answer

ATP

Question 5

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

Accepted Answer

Beating of cilia and flagella

Question 6

Which structure in plant cells allows for the direct transfer of water, ions, and small molecules between adjacent cells?

Accepted Answer

Plasmodesmata

Question 7

According to the endosymbiotic theory, which evidence supports the idea that mitochondria originated from prokaryotic ancestors?

Accepted Answer

Mitochondria have circular DNA and free ribosomes similar to bacteria.

Question 8

Which of the following best describes the function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

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

Question 9

A patient is diagnosed with a genetic disorder that impairs the formation of intermediate filaments. Which cellular property is most likely compromised?

Accepted Answer

Structural support and maintenance of cell shape

Question 10

Which type of cell junction in animal tissues prevents the leakage of extracellular fluid between epithelial cells?

Accepted Answer

Tight junctions

Question 11

A muscle cell contracts due to the interaction of actin and myosin. Which cytoskeletal element is directly involved in this process?

Accepted Answer

Microfilaments

Question 12

Which organelle is responsible for breaking down and recycling cellular waste through autophagy?

Accepted Answer

Lysosome

Question 13

A freshwater protist uses a contractile vacuole to maintain osmotic balance. What is the primary function of this organelle?

Accepted Answer

Pumping excess water out of the cell

Question 14

Which component of the plasma membrane is primarily responsible for its selective permeability?

Accepted Answer

Phospholipid bilayer

Question 15

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 16

Which extracellular structure in animal cells provides support, adhesion, and regulation, and communicates with the cytoskeleton via integrins?

Accepted Answer

Extracellular matrix (ECM)

Question 17

If a cell's microtubules are disrupted by a toxin, which process would be most directly affected during cell division?

Accepted Answer

Separation of chromosomes

Question 18

Which organelle in plant cells contains the pigment chlorophyll and is the site of photosynthesis?

Accepted Answer

Chloroplast

Question 19

A cell is unable to produce transport vesicles from the rough ER. Which process would be most directly impaired?

Accepted Answer

Modification of proteins in the Golgi apparatus

Question 20

Which of the following best describes the role of peroxisomes in eukaryotic cells?

Accepted Answer

They produce hydrogen peroxide and convert it to water during oxidation reactions.

Cell Structure and Function: Principles and Themes in General Biology

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