Question 1

Which of the following statements best describes the Endosymbiotic Theory?

Accepted Answer

It suggests that mitochondria and chloroplasts originated as independent prokaryotes that were engulfed by ancestral eukaryotic cells, forming a mutualistic relationship.

Question 2

Which cellular structure is responsible for producing ATP through aerobic respiration in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 3

A scientist observes a cell with a nucleoid region, circular DNA, and no membrane-bound organelles. Which type of cell is being observed?

Accepted Answer

Prokaryotic cell

Question 4

Which of the following best explains why cells are limited in size?

Accepted Answer

As cells increase in size, their volume increases faster than their surface area, making exchange of materials inefficient.

Question 5

Which formula correctly calculates the surface area of a sphere?

Accepted Answer

$$A=4\pi r^2$

Question 6

A plant cell is placed in a hypertonic solution. What will most likely happen to the cell?

Accepted Answer

It will lose water, causing the cytoplasm to shrink away from the cell wall (plasmolysis).

Question 7

Which organelle is primarily responsible for packaging and modifying proteins for secretion?

Accepted Answer

Golgi apparatus

Question 8

Which of the following is a function of the cytoskeleton in eukaryotic cells?

Accepted Answer

Reinforcing, organizing, and moving cell structures

Question 9

Which of the following molecules can most easily diffuse through the phospholipid bilayer of the plasma membrane?

Accepted Answer

Small nonpolar molecules like $$O_2$$

Question 10

What is the main role of cholesterol in animal cell membranes?

Accepted Answer

It stabilizes membrane fluidity across temperature changes.

Question 11

Which equation represents water potential ($$\Psi) in $$plant cells?

Accepted Answer

$$\Psi = \Psi_s + \Psi_p$$

Question 12

A neuron requires rapid transport of vesicles along its axon. Which cellular structure facilitates this process?

Accepted Answer

Cytoskeleton (microtubules)

Question 13

Which process requires energy input from ATP to move molecules against their concentration gradient?

Accepted Answer

Active transport

Question 14

Which of the following is true about plasmids in prokaryotic cells?

Accepted Answer

They are small, circular DNA molecules that can be shared between bacteria.

Question 15

Which organelle is responsible for breaking down macromolecules and cellular debris in animal cells?

Accepted Answer

Lysosome

Question 16

A cell is observed to have a large central vacuole exerting turgor pressure. What type of cell is this most likely?

Accepted Answer

Plant cell

Question 17

Which of the following best describes the function of aquaporins?

Accepted Answer

They facilitate the diffusion of water across cell membranes.

Question 18

Which of the following is a real-world example of increasing surface area for absorption in multicellular organisms?

Accepted Answer

The presence of microvilli in the small intestine.

Question 19

Which of the following is NOT a function of membrane proteins?

Accepted Answer

Synthesizing ATP

Question 20

A cell is placed in a solution with a lower solute concentration than its cytoplasm. What type of solution is this, and what will happen to the cell?

Accepted Answer

Hypotonic; the cell will gain water and may swell.

Cell Structure and Function: Study Notes for Cell Biology

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