Question 1

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

Accepted Answer

They convert the energy in organic molecules to ATP through cellular respiration.

Question 2

A scientist observes a double-membraned organelle containing its own DNA and ribosomes. Which organelle is most likely being observed?

Accepted Answer

Mitochondrion

Question 3

Which structure is primarily responsible for maintaining the shape of animal cells and enabling their movement?

Accepted Answer

Cytoskeleton

Question 4

Microtubules are composed of which protein subunit, and what is their primary function?

Accepted Answer

Tubulin; providing structural support and serving as tracks for organelle movement

Question 5

Which of the following best explains why plant cells can withstand higher internal pressure than animal cells?

Accepted Answer

Plant cells have a rigid cell wall made primarily of cellulose.

Question 6

A mutation disrupts the formation of actin filaments in a cell. Which cellular process would be most directly affected?

Accepted Answer

Muscle contraction and cell movement

Question 7

Which of the following cell junctions forms a watertight seal between adjacent animal cells, preventing the passage of molecules between them?

Accepted Answer

Tight junctions

Question 8

In a plant cell, which structure allows the direct transfer of water, ions, and small molecules between neighboring cells?

Accepted Answer

Plasmodesmata

Question 9

Which of the following best describes the composition and function of the extracellular matrix (ECM) in animal cells?

Accepted Answer

It is composed mainly of collagen and glycoproteins and provides structural support and cell signaling.

Question 10

A researcher is studying a protein that connects the cytoskeleton to the extracellular matrix. Which type of protein is most likely being studied?

Accepted Answer

Integrin

Question 11

Which of the following is a key difference between microtubules and intermediate filaments?

Accepted Answer

Microtubules are hollow and dynamic, while intermediate filaments are solid and provide mechanical strength.

Question 12

Which of the following best describes the role of chloroplasts in plant cells?

Accepted Answer

They convert solar energy to ATP and organic molecules during photosynthesis.

Question 13

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 14

Which of the following statements about the phospholipid bilayer is correct?

Accepted Answer

It forms the basic structure of most cellular membranes, with hydrophilic heads facing outward and hydrophobic tails inward.

Question 15

Which of the following best explains the function of desmosomes in animal tissues?

Accepted Answer

They anchor cells together into strong sheets by connecting intermediate filaments.

Question 16

A patient has a genetic disorder affecting the synthesis of collagen. Which cellular structure or function is most likely to be compromised?

Accepted Answer

Formation of the extracellular matrix (ECM)

Question 17

Which of the following is a correct sequence of protein structure formation, as seen in the assembly of tubulin or actin?

Accepted Answer

Primary structure → secondary structure → tertiary structure → quaternary structure

Question 18

Which of the following best describes the function of gap junctions in animal cells?

Accepted Answer

They form channels that allow the passage of ions and small molecules between neighboring cells.

Question 19

A plant cell is placed in a hypotonic solution. Which structure prevents the cell from bursting, and what is it primarily made of?

Accepted Answer

Cell wall; cellulose

Question 20

Which of the following is a real-world example of the importance of the cytoskeleton in human health?

Accepted Answer

Defects in microtubules can lead to neurodegenerative diseases such as Alzheimer's, due to impaired transport of materials within neurons.

The Cell Part 2: Eukaryotic Cell Structure and Function

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