Question 1

Which of the following statements best describes the main difference between prokaryotic and eukaryotic cells?

Accepted Answer

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

Question 2

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

Accepted Answer

Rough endoplasmic reticulum

Question 3

A mutation affects the SNARE proteins in a cell. Which process is most likely to be disrupted?

Accepted Answer

Vesicle fusion and transport

Question 4

Which of the following best explains the role of peroxisomes in cellular metabolism?

Accepted Answer

They degrade hydrogen peroxide via catalase.

Question 5

A cell is observed to have an extensive network of rough endoplasmic reticulum. What is the most likely function of this cell?

Accepted Answer

Protein secretion

Question 6

Which equation correctly represents the conversion of glucose to ATP in mitochondria?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + 36\mathrm{ATP}$$

Question 7

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

Accepted Answer

Modification and sorting of proteins

Question 8

A patient has a genetic defect in the ABC transporter proteins of peroxisomes. Which cellular process is most likely affected?

Accepted Answer

Import of long-chain fatty acids into peroxisomes

Question 9

Which structure is responsible for maintaining the acidic pH inside lysosomes?

Accepted Answer

V-type ATPase proton pump

Question 10

Which cytoskeletal element is primarily involved in cell division and chromosome separation?

Accepted Answer

Microtubules

Question 11

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

Accepted Answer

Smooth endoplasmic reticulum

Question 12

Which of the following best describes the function of catalase in peroxisomes?

Accepted Answer

Catalase breaks down hydrogen peroxide into water and oxygen.

Question 13

Which process is most directly affected by a defect in COPII proteins?

Accepted Answer

Transport of proteins from the endoplasmic reticulum to the Golgi apparatus

Question 14

Which of the following is a key function of mitochondria in eukaryotic cells?

Accepted Answer

ATP production via oxidative phosphorylation

Question 15

Which of the following best describes the role of the plasma membrane in cellular homeostasis?

Accepted Answer

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

Question 16

A cell is observed to have defective TOM and TIM complexes. Which process is most likely impaired?

Accepted Answer

Import of proteins into mitochondria

Question 17

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

Accepted Answer

Lipid and steroid synthesis

Question 18

Which of the following best explains the role of the Golgi apparatus in glycosylation?

Accepted Answer

It modifies and sorts glycoproteins received from the ER.

Question 19

Which of the following is a medical consequence of lysosomal dysfunction?

Accepted Answer

Accumulation of undigested macromolecules leading to lysosomal storage diseases

Question 20

Which of the following best describes the function of microfilaments in the cell?

Accepted Answer

They are involved in cell shape and movement.

Molecular Organization of the Cell: Structure and Function of Cellular Components

Study Guide - Practice Questions