Question 1

Which of the following best describes the primary function of the mitochondrion in a eukaryotic cell?

Accepted Answer

ATP production through aerobic respiration

Question 2

A cell is observed to have an abundance of lysosomes. Which of the following is the most likely function of this cell?

Accepted Answer

Intracellular digestion of pathogens

Question 3

Which cytoskeletal element is primarily responsible for the movement of organelles within the cell and is composed of tubulin subunits?

Accepted Answer

Microtubules

Question 4

During which phase of the cell cycle does DNA replication occur, and what is the significance of this process?

Accepted Answer

S phase; ensures genetic material is duplicated for cell division

Question 5

Which of the following structures increases the surface area of a cell for absorption and is commonly found in intestinal epithelial cells?

Accepted Answer

Microvilli

Question 6

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

Accepted Answer

Synthesis of ribosomal subunits

Question 7

Which organelle is most similar to bacteria in structure and function, and what evidence supports this similarity?

Accepted Answer

Mitochondrion; double membrane and own DNA

Question 8

A patient’s liver cells are unable to break down fatty acids efficiently. Which organelle is most likely malfunctioning?

Accepted Answer

Peroxisome

Question 9

Which checkpoint in the cell cycle ensures that the cell’s DNA is undamaged before proceeding to DNA synthesis?

Accepted Answer

G1 checkpoint

Question 10

Which of the following best describes semiconservative DNA replication?

Accepted Answer

Each new DNA molecule consists of one parental and one new strand

Question 11

A scientist observes a cell with a large number of rough endoplasmic reticulum. What is the most likely function of this cell?

Accepted Answer

Production of digestive enzymes

Question 12

Which cytoskeletal component provides tensile strength to cells and is composed of a diverse array of fibrils?

Accepted Answer

Intermediate filaments

Question 13

If a cell’s Golgi apparatus is damaged, which process would be most directly impaired?

Accepted Answer

Packaging and distribution of proteins

Question 14

Which of the following equations best represents the overall reaction for aerobic cellular respiration occurring in mitochondria?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP}$$

Question 15

Which of the following best explains why microvilli are abundant on the surface of intestinal epithelial cells?

Accepted Answer

They increase the surface area for nutrient absorption

Question 16

A cell is unable to complete mitosis due to a defect in the centrosome. Which process is most directly affected?

Accepted Answer

Organization of the mitotic spindle

Question 17

Which of the following is a function of peroxisomes in liver cells?

Accepted Answer

Detoxification of hydrogen peroxide

Question 18

Which of the following best describes the role of ribosomes in the cell?

Accepted Answer

Synthesis of proteins from mRNA templates

Question 19

Which of the following best describes the difference between cilia and flagella?

Accepted Answer

Cilia are shorter and more numerous than flagella

Question 20

A mutation in the gene encoding actin would most directly affect which cellular structure?

Accepted Answer

Microfilaments

Cytology: The Cytoplasm, Organelles, and Cell Cycle

Study Guide - Practice Questions