Question 1

Which of the following statements best describes the function of the cytoskeleton in eukaryotic cells?

Accepted Answer

It maintains cell shape, enables movement of organelles, and facilitates cell division.

Question 2

A scientist observes a cell with a nucleus, mitochondria, and a cell wall made of chitin. Which type of organism is this cell most likely from?

Accepted Answer

A fungus

Question 3

Which of the following best explains why most cells are between 1 and 100 micrometers in diameter?

Accepted Answer

Smaller cells have a higher surface area-to-volume ratio, allowing efficient exchange of nutrients and wastes.

Question 4

During muscle contraction, which cytoskeletal component is primarily involved?

Accepted Answer

Microfilaments (actin)

Question 5

Which of the following structures is responsible for packaging, modifying, and sorting proteins for secretion or delivery to other organelles?

Accepted Answer

Golgi apparatus

Question 6

A cell is observed to have a single, circular chromosome, no membrane-bound organelles, and a nucleoid region. Which type of cell is this?

Accepted Answer

Prokaryotic cell

Question 7

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

Accepted Answer

They digest macromolecules and recycle cellular components.

Question 8

Which of the following is a key piece of evidence supporting the endosymbiont hypothesis for the origin of mitochondria and chloroplasts?

Accepted Answer

They both contain their own DNA and ribosomes.

Question 9

Which of the following junctions would you expect to find in tissues that must prevent leakage of extracellular fluid, such as the lining of the urinary bladder?

Accepted Answer

Tight junctions

Question 10

A mutation causes a cell to lack functional tubulin proteins. Which of the following processes would be most directly affected?

Accepted Answer

Movement of chromosomes during cell division

Question 11

Which of the following best describes the role of the nucleolus?

Accepted Answer

It is the site of ribosome synthesis.

Question 12

Which of the following is a function of the plant cell central vacuole?

Accepted Answer

Providing turgor pressure to keep the cell rigid

Question 13

Which of the following best explains why mitochondria are often called the 'powerhouses of the cell'?

Accepted Answer

They extract energy from food molecules and store it in ATP.

Question 14

Which of the following structures is found in both prokaryotic and eukaryotic cells?

Accepted Answer

Ribosomes

Question 15

A researcher is studying a cell that uses cilia to move fluid past its surface. Which of the following is a likely real-life example of this cell type?

Accepted Answer

A cell lining the human respiratory tract

Question 16

Which of the following best describes the function of peroxisomes?

Accepted Answer

They detoxify harmful compounds by producing hydrogen peroxide ($$2H_2O_2).$$

Question 17

Which of the following is a correct sequence of the pathway for a protein that is synthesized for export from a eukaryotic cell?

Accepted Answer

Rough ER → Golgi apparatus → Vesicle → Plasma membrane

Question 18

Which of the following statements about plasmodesmata is true?

Accepted Answer

They are found in plant cells and form cytoplasmic connections between adjacent cells.

Question 19

Which of the following best describes the difference between chromatin and chromosomes?

Accepted Answer

Chromatin is the diffuse form of DNA and proteins, while chromosomes are the condensed form during cell division.

Question 20

A cell is observed to have a large number of rough endoplasmic reticulum. Which of the following is the most likely function of this cell?

Accepted Answer

Production of large amounts of proteins for export

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

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