Question 1

Which of the following best describes the main advantage of eukaryotic cells having internal membranes and compartmentalized organelles?

Accepted Answer

They create specialized environments for distinct metabolic reactions, increasing efficiency and protection.

Question 2

A scientist is using a microscope to observe live cells and wants to see the internal structure of the cell in high detail. Which type of microscope should they use, and why?

Accepted Answer

Light microscope, because it allows observation of live cells and their internal structures, though with less detail than electron microscopes.

Question 3

Which cellular structure is found in all three domains of life (Bacteria, Archaea, Eukarya)?

Accepted Answer

Phospholipid bilayer cell membrane

Question 4

A cell is observed to have a large central vacuole, chloroplasts, and a cell wall made of cellulose. Which type of cell is this, and what is the function of the central vacuole?

Accepted Answer

Plant cell; the central vacuole stores water and organic compounds, maintaining cell structure.

Question 5

Which of the following best explains why small cells have a greater surface area to volume ratio than large cells?

Accepted Answer

Small cells can exchange substances more efficiently across their membrane.

Question 6

A patient with Tay-Sachs disease has a genetic defect in a lipid-digesting enzyme. Which organelle is most directly affected, and what is its primary function?

Accepted Answer

Lysosome; digestion and recycling of macromolecules

Question 7

Which of the following is NOT a function of the smooth endoplasmic reticulum (SER)?

Accepted Answer

Packaging and modification of secretory proteins

Question 8

During muscle contraction, which organelle releases calcium ions to trigger the process?

Accepted Answer

Smooth endoplasmic reticulum

Question 9

Which of the following best describes the pathway for a secretory protein from synthesis to secretion?

Accepted Answer

Rough ER → Golgi apparatus → transport vesicle → plasma membrane

Question 10

Which of the following is a key feature of mitochondria and chloroplasts that supports the endosymbiont theory?

Accepted Answer

They contain circular DNA and divide independently by binary fission.

Question 11

Which cytoskeletal component is primarily responsible for the movement of cilia and flagella?

Accepted Answer

Microtubules

Question 12

A cell in the trachea uses cilia to sweep mucus out of the lungs. Which cytoskeletal structure is involved, and what is its function?

Accepted Answer

Microtubules; enable motility of cilia

Question 13

Which intercellular junction in animal cells is most similar in function to plasmodesmata in plant cells?

Accepted Answer

Gap junctions

Question 14

Which of the following is a function of the extracellular matrix (ECM) in animal cells?

Accepted Answer

Regulates cell behavior and communication through integrins

Question 15

Which cytoskeletal element is most important for maintaining the shape of animal cells that lack cell walls?

Accepted Answer

Microfilaments

Question 16

A white blood cell engulfs a bacterium by phagocytosis. Which organelle is responsible for digesting the bacterium after engulfment?

Accepted Answer

Lysosome

Question 17

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

Accepted Answer

They detoxify alcohol and break down fatty acids, producing hydrogen peroxide as a byproduct.

Question 18

Which of the following statements about ribosomes is correct?

Accepted Answer

Bound ribosomes make proteins for export or for use in membranes.

Question 19

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

Accepted Answer

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

Question 20

Which formula correctly represents the surface area to volume ratio for a spherical cell?

Accepted Answer

Surface area: $$4\pi r^2$, Volume: $$\frac{4}{3}\pi $$r^3$$, Ratio: $$\frac{4\pi r^2$}{\frac{4}{3}\pi r^3$}$$

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

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