Question 1

Which of the following best describes the Fluid Mosaic Model of the plasma membrane?

Accepted Answer

A dynamic structure with a double layer of phospholipids and proteins embedded throughout, allowing lateral movement.

Question 2

A cell is placed in a solution with a higher concentration of solutes than inside the cell. What process will occur, and what is the direction of water movement?

Accepted Answer

Osmosis; water will move out of the cell.

Question 3

Which membrane protein function is most directly involved in cellular recognition and immune response?

Accepted Answer

Glycoproteins

Question 4

A patient is unable to efficiently transport glucose into their cells, even though glucose concentration is higher outside the cell than inside. Which membrane transport process is most likely impaired?

Accepted Answer

Facilitated diffusion

Question 5

Which of the following best explains why sodium (Na$$^+) $$ions are more concentrated outside the cell and potassium (K$$^+) $$ions are more concentrated inside the cell?

Accepted Answer

Active transport by the Na$$^+/K$^+$$ pump, which moves Na$$^+$$ out and K$$^+ in $$against their concentration gradients

Question 6

Which organelle is primarily responsible for ATP production in eukaryotic cells?

Accepted Answer

Mitochondria

Question 7

A cell engulfs a bacterium by forming a vesicle around it. What is this process called?

Accepted Answer

Phagocytosis

Question 8

Which of the following statements about the cytoskeleton is TRUE?

Accepted Answer

Intermediate filaments provide mechanical support and help cells resist stress.

Question 9

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

Accepted Answer

Primary active transport

Question 10

A cell releases neurotransmitters into the synaptic cleft. Which process is responsible for this release?

Accepted Answer

Exocytosis

Question 11

Which of the following best describes the role of cholesterol in the plasma membrane?

Accepted Answer

It stabilizes the membrane and reduces its permeability to water-soluble substances.

Question 12

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

Accepted Answer

Modifies, sorts, and packages proteins and lipids for transport

Question 13

A cell is exposed to a toxin that inhibits aquaporin function. What process will be most directly affected?

Accepted Answer

Osmosis of water

Question 14

Which of the following is TRUE regarding secondary active transport?

Accepted Answer

It relies on the energy stored in ion gradients created by primary active transport.

Question 15

Which of the following best describes the function of tight junctions in epithelial cells?

Accepted Answer

They prevent substances from leaking between adjacent cells.

Question 16

Which of the following is a correct statement about the resting membrane potential?

Accepted Answer

The membrane is polarized, with the inside negatively charged relative to the outside.

Question 17

Which organelle is responsible for detoxifying harmful substances such as alcohol and formaldehyde?

Accepted Answer

Peroxisome

Question 18

Which of the following is a function of the nuclear envelope?

Accepted Answer

Separates the nucleus from the cytoplasm and controls what enters and leaves the nucleus

Question 19

A cell is observed to have a large number of rough endoplasmic reticulum. What is the most likely function of this cell?

Accepted Answer

Production and export of proteins

Question 20

Which of the following best describes the process of receptor-mediated endocytosis?

Accepted Answer

The cell takes in specific molecules by binding them to receptors on the cell surface before forming a vesicle.

Cellular Basis of Life: Structure and Function of Cells and Organelles

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