Question 1

Which of the following best describes the function of the Golgi apparatus in a eukaryotic cell?

Accepted Answer

It modifies and packages proteins for delivery, export, or lysosome formation.

Question 2

A scientist observes a cell with a nucleus, rough and smooth endoplasmic reticulum, and mitochondria. Which type of cell is being observed?

Accepted Answer

Eukaryotic cell

Question 3

Which organelle is primarily responsible for the degradation of biological molecules in animal cells?

Accepted Answer

Lysosome

Question 4

A cell is exposed to a toxin that inhibits the function of its ribosomes. What process will be directly affected?

Accepted Answer

Protein synthesis

Question 5

Which structure increases the surface area of a cell to enhance absorption of nutrients?

Accepted Answer

Microvilli

Question 6

A patient has a genetic disorder affecting the function of aquaporins in their kidney cells. Which process is most likely impaired?

Accepted Answer

Osmosis of water

Question 7

Which of the following statements about the plasma membrane is TRUE?

Accepted Answer

Cholesterol stabilizes the membrane structure.

Question 8

Which cell junction allows direct exchange of materials between adjacent cells, such as in cardiac muscle?

Accepted Answer

Gap junctions

Question 9

A cell needs to move glucose from an area of high concentration outside the cell to a lower concentration inside the cell. Which transport mechanism is most likely used?

Accepted Answer

Facilitated diffusion

Question 10

Which of the following molecules can freely cross the plasma membrane by simple diffusion?

Accepted Answer

Oxygen ($\mathrm{O}_2$)

Question 11

A cell is placed in a solution with a higher solute concentration than its cytosol. According to osmosis, what will happen to the cell?

Accepted Answer

Water will move out of the cell, causing it to shrink.

Question 12

Which of the following best describes secondary active transport?

Accepted Answer

It uses the energy from one molecule’s gradient to move another molecule.

Question 13

During receptor-mediated endocytosis, which of the following occurs?

Accepted Answer

Specific ligands bind to receptors, triggering the cell to engulf them.

Question 14

Which cytoskeletal element is primarily responsible for maintaining cell shape and suspending organelles?

Accepted Answer

Intermediate filaments

Question 15

A sperm cell uses a single, highly mobile extension to propel itself. What is this structure called?

Accepted Answer

Flagellum

Question 16

Which of the following is a function of the extracellular matrix (ECM)?

Accepted Answer

It provides structural support and aids in cell communication.

Question 17

Which of the following is TRUE regarding the fluid mosaic model of the plasma membrane?

Accepted Answer

Phospholipids and proteins can move laterally within the membrane.

Question 18

A cell is actively transporting sodium ions ($\mathrm{Na}^+$) from low concentration inside the cell to high concentration outside. Which equation best represents the energy requirement for this process?

Accepted Answer

Energy required: $\Delta G > 0$

Question 19

Which of the following best explains why oxygen ($\mathrm{O}_2$) and carbon dioxide ($\mathrm{CO}_2$) can freely cross the plasma membrane?

Accepted Answer

They are small, non-polar, and lipid-soluble.

Question 20

A cell is exposed to a solution containing a ligand that binds perfectly to a membrane receptor. What is the most likely outcome?

Accepted Answer

The receptor will trigger a specific cellular response.

Cells and Membrane Transport: Structure, Organelles, and Transport Mechanisms

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