Question 1

Which of the following best explains why mitochondria are referred to as the 'powerhouses' of the cell?

Accepted Answer

They generate most of the cell's ATP through aerobic respiration, using glucose and oxygen.

Question 2

A scientist is studying a cell that has a large number of mitochondria. Which of the following is the most likely function of this cell?

Accepted Answer

It is specialized for energy-intensive processes, such as muscle contraction.

Question 3

Which organelle is primarily responsible for the synthesis of proteins that are destined for export from the cell?

Accepted Answer

Rough endoplasmic reticulum

Question 4

A mutation disrupts the function of the lysosomal membrane, preventing it from sequestering hydrogen ions. What is the most likely consequence for the cell?

Accepted Answer

Digestive enzymes will not function optimally, leading to accumulation of waste and possible cell damage.

Question 5

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

Accepted Answer

They detoxify harmful substances and neutralize free radicals.

Question 6

During cell division, which cytoskeletal element is most directly involved in separating chromosomes?

Accepted Answer

Microtubules

Question 7

Which of the following statements about the plasma membrane is correct?

Accepted Answer

It is a dynamic lipid bilayer with embedded proteins that regulate transport and cell recognition.

Question 8

A cell is observed to have numerous microvilli on its surface. What is the most likely function of this cell?

Accepted Answer

Absorption of nutrients, as in intestinal epithelial cells.

Question 9

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

Accepted Answer

It modifies, concentrates, and packages proteins for delivery to specific destinations.

Question 10

Which organelle contains its own DNA and is inherited maternally?

Accepted Answer

Mitochondrion

Question 11

A cell is unable to synthesize phospholipids and cholesterol. Which organelle is most likely malfunctioning?

Accepted Answer

Smooth endoplasmic reticulum

Question 12

Which of the following is a function of microfilaments in muscle cells?

Accepted Answer

They facilitate contraction by sliding actin and myosin filaments past one another.

Question 13

Which structure is responsible for forming the basis of cilia and flagella?

Accepted Answer

Centrosome (centrioles)

Question 14

Which of the following best describes the function of gap junctions between cells?

Accepted Answer

They allow direct passage of ions and small molecules between adjacent cells.

Question 15

Which of the following equations correctly represents the detoxification reaction catalyzed by peroxisomes?

Accepted Answer

$$H_2O_2 \rightarrow H_2O + O_2$

Question 16

A cell is observed to have a large, spherical nucleus with prominent nucleoli. What does this suggest about the cell's activity?

Accepted Answer

It is actively synthesizing ribosomal RNA and proteins.

Question 17

Which of the following statements about chromatin is correct?

Accepted Answer

Chromatin condenses to form chromosomes during cell division.

Question 18

Which organelle is most likely to be abundant in phagocytic cells such as macrophages, and why?

Accepted Answer

Lysosomes, because they digest engulfed bacteria and debris.

Question 19

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

Accepted Answer

It produces ribosomal RNA and assembles ribosomal subunits.

Question 20

Which of the following is a direct consequence of enzyme activity within a cell?

Accepted Answer

Enzymes decrease the activation energy required for chemical reactions, increasing reaction rates.

Cellular Structures and Organelles: Anatomy & Physiology I Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards