Question 1

Which of the following best describes the main function of the cytoskeleton in eukaryotic cells, as shown in the first image?

Accepted Answer

It provides structural support, enables cell movement, and organizes cell components.

Question 2

Which process is responsible for the division of prokaryotic cells, and what is the main difference compared to mitosis?

Accepted Answer

Binary fission; it does not involve spindle fibers or a nucleus.

Question 3

In the context of multicellularity, what is the primary significance of cell adherence?

Accepted Answer

It enables cells to form tissues and maintain structural integrity.

Question 4

Which of the following organisms, shown in the images, is an example of a colonial organism rather than a truly multicellular organism?

Accepted Answer

Volvox (green spheres with daughter colonies)

Question 5

What is a tissue, and which group of organisms generally lacks true tissues?

Accepted Answer

A tissue is a group of cells with similar function; sponges generally lack true tissues.

Question 6

Which of the following best explains why plant cells can sometimes return to an undifferentiated state, while animal cells usually cannot?

Accepted Answer

Plant cells can respond to specific chemical signals that reprogram gene expression.

Question 7

Which of the following is NOT a function of the extracellular matrix in multicellular organisms?

Accepted Answer

Synthesizing ATP for cellular energy

Question 8

A mutation causes human cells to lose their ability to adhere to one another. Which of the following is a likely consequence?

Accepted Answer

Formation of functional tissues is impaired, potentially leading to diseases such as cancer.

Question 9

Which cytoskeletal element is primarily responsible for the movement of cilia and flagella, as seen in some unicellular and multicellular organisms?

Accepted Answer

Microtubules

Question 10

Which equation best represents the relationship between cell division rate ($$r$$), cell death rate ($$d$$), and net population growth ($$G) in a $$simple multicellular organism?

Accepted Answer

$$G = r - d$$

Question 11

Which of the following best describes the difference between a cell’s genome and its proteome?

Accepted Answer

The genome is the complete set of DNA, while the proteome is the complete set of proteins expressed by the cell.

Question 12

Which of the following scenarios best illustrates cell differentiation in a multicellular organism?

Accepted Answer

A stem cell develops into a muscle cell in response to specific signals.

Question 13

Which of the following is a real-world example of a biofilm, demonstrating bacterial differentiation?

Accepted Answer

Dental plaque on teeth

Question 14

Which of the following statements about the cytoskeleton is correct?

Accepted Answer

It is dynamic and made of proteins, allowing for cell shape changes and movement.

Question 15

Which of the following best explains why multicellular organisms require cell-to-cell recognition and signaling?

Accepted Answer

To coordinate activities and maintain tissue function.

Question 16

Which of the following is a plausible outcome if a multicellular organism’s cells lose the ability to adhere to each other?

Accepted Answer

Tissues would disintegrate, leading to loss of function.

Question 17

Which of the following best describes the process of mitosis?

Accepted Answer

Division of the nucleus resulting in two genetically identical daughter cells.

Question 18

Which of the following is a key difference between prokaryotic and eukaryotic cytoskeletons?

Accepted Answer

Eukaryotic cytoskeletons are more complex and contain multiple types of filaments.

Question 19

Which of the following best describes the role of protein-protein interactions in multicellular organisms?

Accepted Answer

They allow cells to recognize and adhere to each other, forming tissues.

Cell Organization: Multicellularity, Differentiation, and Cytoskeleton

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