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, allowing efficient exchange of materials with their environment.

Question 2

A scientist wants to study the internal structure of mitochondria at the highest possible resolution. Which microscopy technique should they use?

Accepted Answer

Transmission electron microscopy (TEM)

Question 3

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

Accepted Answer

Mitochondria

Question 4

A mutation prevents the formation of dynein proteins in a cell. Which cellular structure would be most directly affected?

Accepted Answer

Cilia and flagella

Question 5

Which of the following statements about the endosymbiont theory is CORRECT?

Accepted Answer

Mitochondria and chloroplasts originated from free-living prokaryotes engulfed by ancestral eukaryotic cells.

Question 6

Which organelle is responsible for the synthesis of lipids and detoxification of drugs in liver cells?

Accepted Answer

Smooth endoplasmic reticulum

Question 7

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

Accepted Answer

Cell wall

Question 8

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

Accepted Answer

They allow the passage of water, small solutes, and sometimes proteins and RNA between adjacent cells.

Question 9

Which of the following is a function of peroxisomes?

Accepted Answer

Breakdown of fatty acids and detoxification of alcohol

Question 10

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

Accepted Answer

Microtubules

Question 11

A cell is observed to have a large number of ribosomes attached to its endoplasmic reticulum. What is the most likely function of this cell?

Accepted Answer

Synthesis of proteins for export

Question 12

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

Accepted Answer

It provides structural support and can influence gene activity through signaling pathways.

Question 13

Which of the following cell junctions prevents the leakage of extracellular fluid between animal cells?

Accepted Answer

Tight junctions

Question 14

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

Accepted Answer

Presence of membrane-bound organelles

Question 15

A mutation disrupts the function of the nuclear lamina. Which process would be most directly affected?

Accepted Answer

Maintenance of nuclear shape

Question 16

Which of the following best explains why mitochondria and chloroplasts are considered semiautonomous organelles?

Accepted Answer

They contain their own DNA and ribosomes and can grow and reproduce independently within the cell.

Question 17

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

Accepted Answer

Modification, sorting, and packaging of proteins and lipids for secretion or delivery to other organelles

Question 18

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

Accepted Answer

They help maintain cell shape, are involved in muscle contraction, and enable cell movement.

Question 19

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

Accepted Answer

Central vacuole

Question 20

A cell is observed to have an extensive network of flattened, membranous sacs with attached ribosomes. Which organelle is this, and what is its primary function?

Accepted Answer

Rough endoplasmic reticulum; synthesis of proteins for secretion or membrane insertion

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

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