Question 1

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

Accepted Answer

Smaller cells have a larger surface-to-volume ratio, which facilitates efficient exchange of materials across the plasma membrane.

Question 2

A scientist wants to observe the detailed internal structure of mitochondria. Which microscope should they use and why?

Accepted Answer

Transmission electron microscope, because it provides high resolution images of internal cell structures.

Question 3

Which of the following is NOT a component found in all cells?

Accepted Answer

Nucleus

Question 4

Which structure is responsible for synthesizing proteins according to the instructions from DNA?

Accepted Answer

Ribosome

Question 5

A mutation prevents the formation of the nucleolus in a cell. Which process would be directly affected?

Accepted Answer

Assembly of ribosomal subunits

Question 6

Which of the following best describes the function of the Golgi apparatus?

Accepted Answer

It modifies, sorts, and ships products from the endoplasmic reticulum to other destinations.

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 statements supports the endosymbiont theory for the origin of mitochondria and chloroplasts?

Accepted Answer

Both mitochondria and chloroplasts contain their own DNA and ribosomes, similar to prokaryotes.

Question 9

Which of the following correctly matches the cytoskeletal element with its function?

Accepted Answer

Microfilaments: muscle contraction and amoeboid movement

Question 10

A patient has a genetic disorder that affects the formation of gap junctions. Which of the following symptoms might you expect?

Accepted Answer

Impaired communication between adjacent cells

Question 11

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

Accepted Answer

It supports the plasma membrane and communicates with the cytoskeleton.

Question 12

Which of the following best describes the role of lysosomes in a white blood cell that engulfs bacteria?

Accepted Answer

Lysosomes fuse with vesicles containing bacteria and digest them using hydrolytic enzymes.

Question 13

Which of the following is a key difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have membrane-bound organelles, while prokaryotic cells do not.

Question 14

A mutation causes a cell to lack functional peroxisomes. Which process would be most directly affected?

Accepted Answer

Breakdown of fatty acids and detoxification of harmful substances

Question 15

Which of the following best describes the function of the plasma membrane?

Accepted Answer

It regulates the movement of substances into and out of the cell.

Question 16

Which of the following is a real-world example of the importance of compartmentalization in eukaryotic cells?

Accepted Answer

Lysosomal enzymes are separated from the cytoplasm, preventing damage to the cell.

Question 17

Which of the following equations correctly represents the calculation of surface-to-volume ratio for a cube-shaped cell?

Accepted Answer

$$	ext{Surface-to-volume ratio} = \frac{6a^2$}{a^3$}$$

Question 18

Which of the following organelles is directly involved in the energy conversion process of cellular respiration?

Accepted Answer

Mitochondrion

Question 19

Which of the following cell junctions would be most important in the heart muscle to allow rapid passage of ions for synchronized contraction?

Accepted Answer

Gap junctions

Question 20

Which of the following is a unique feature of plant cells that is not found in animal cells?

Accepted Answer

Cell wall composed primarily of cellulose

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

Study Guide - Practice Questions