$$\text{Magnification} = \frac{\text{Image size}}{\text{Actual size}}$$

Question 1

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

Accepted Answer

Small cells have a greater surface area to volume ratio, which facilitates 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 microscope should they use?

Accepted Answer

Transmission electron microscope (TEM)

Question 3

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

Accepted Answer

Mitochondria and chloroplasts originated from prokaryotic cells engulfed by an ancestral eukaryotic cell.

Question 4

Which organelle is primarily responsible for detoxifying harmful substances such as alcohol in liver cells?

Accepted Answer

Smooth endoplasmic reticulum

Question 5

A mutation prevents the formation of tight junctions in epithelial cells. Which of the following is a likely consequence?

Accepted Answer

Substances could leak between cells, compromising tissue barriers such as those in the bladder.

Question 6

Which of the following best describes the function of ribosomes?

Accepted Answer

They synthesize proteins using information encoded in mRNA.

Question 7

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 8

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

Accepted Answer

Mitochondria

Question 9

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

Accepted Answer

Microtubules

Question 10

A researcher isolates a cell structure that contains its own DNA, ribosomes, and a double membrane. Which organelle is this most likely to be?

Accepted Answer

Mitochondrion

Question 11

Which of the following equations correctly represents the calculation of magnification in microscopy?

Accepted Answer

$$	ext{Magnification} = \frac{	ext{Image size}}{	ext{Actual size}}$$

Question 12

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

Accepted Answer

It provides structural support, mediates cell signaling, and helps bind cells together.

Question 13

Which of the following statements about lysosomes is TRUE?

Accepted Answer

They contain hydrolytic enzymes that digest macromolecules and participate in autophagy.

Question 14

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

Accepted Answer

Movement of cilia and flagella

Question 15

Which of the following is a function of the smooth endoplasmic reticulum (SER)?

Accepted Answer

Synthesis of lipids and detoxification of drugs

Question 16

Which of the following cell junctions allows for the direct passage of ions and small molecules between animal cells, facilitating communication?

Accepted Answer

Gap junctions

Question 17

Which of the following best describes the function of peroxisomes?

Accepted Answer

They contain enzymes that detoxify harmful substances by converting them to hydrogen peroxide, which is then broken down to water and oxygen.

Question 18

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

Accepted Answer

Cell wall

Question 19

Which of the following statements about the Golgi apparatus is correct?

Accepted Answer

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

Question 20

A cell is observed to have a high number of lysosomes. Which of the following is the most likely function of this cell?

Accepted Answer

Digesting and recycling cellular debris, such as in macrophages.

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

Study Guide - Practice Questions