Question 1

Which of the following best describes the main function of mitochondria in a eukaryotic cell?

Accepted Answer

They produce most of the cell's ATP via aerobic respiration.

Question 2

A patient is diagnosed with a rare disorder in which their cells cannot efficiently break down fatty acids, leading to toxic buildup. Which organelle is most likely malfunctioning?

Accepted Answer

Peroxisome

Question 3

Which of the following is a correct sequence of events for a protein that is synthesized for secretion from the cell?

Accepted Answer

Ribosome → Rough ER → Golgi apparatus → Plasma membrane

Question 4

A cell is observed to have an extensive smooth endoplasmic reticulum. Which function is this cell most likely specialized for?

Accepted Answer

Lipid metabolism and detoxification

Question 5

Which of the following best explains why compartmentalization by membranes is crucial for eukaryotic cell function?

Accepted Answer

It enables different metabolic processes to occur simultaneously without interference.

Question 6

A genetic defect causes a lack of a specific lysosomal enzyme, resulting in the accumulation of glycolipids in neurons. Which disease does this describe?

Accepted Answer

Tay-Sachs disease

Question 7

Which cytoskeletal element is primarily responsible for the movement of cilia and flagella?

Accepted Answer

Microtubules

Question 8

During which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 9

A scientist observes a cell with many microvilli on its surface. What is the most likely function of this cell?

Accepted Answer

Increasing surface area for absorption

Question 10

Which of the following best distinguishes apoptosis from autophagy?

Accepted Answer

Autophagy involves the degradation of nonfunctional organelles, while apoptosis leads to the death and removal of the entire cell.

Question 11

A cell is unable to form cilia or flagella due to a defect in a specific organelle. Which organelle is most likely affected?

Accepted Answer

Centrioles

Question 12

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

Accepted Answer

Packaging and modifying proteins for secretion

Question 13

A cell is observed to have a high number of free ribosomes. Which type of protein is this cell most likely producing in abundance?

Accepted Answer

Proteins that function in the cytosol

Question 14

Which of the following equations best represents the aerobic production of ATP in mitochondria?

Accepted Answer

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

Question 15

A cell is exposed to a toxin that inhibits catalase. Which of the following would most likely accumulate as a result?

Accepted Answer

Hydrogen peroxide ($H_2O_2$)

Question 16

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

Accepted Answer

It is the site of ribosomal RNA (rRNA) synthesis and ribosome assembly.

Question 17

A cell is observed to be in a phase where it is preparing for division by synthesizing proteins and organelles, but DNA replication has already occurred. Which phase is this?

Accepted Answer

G2 phase

Question 18

Which of the following best explains why normal cells stop dividing when they come into contact with other cells?

Accepted Answer

Contact inhibition signals them to stop dividing.

Question 19

A patient with progeria displays symptoms of premature aging due to a defect in which cellular structure?

Accepted Answer

Nuclear lamina

Question 20

Which of the following best describes the difference between hypertrophy and hyperplasia?

Accepted Answer

Hypertrophy is an increase in cell size; hyperplasia is an increase in cell number.

Cells: The Living Units – Structure and Function of Cellular Components

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