Question 1

Which of the following best describes the function of the phospholipid bilayer in the plasma membrane?

Accepted Answer

It forms a selectively permeable barrier, allowing lipid-soluble substances to pass while restricting water-soluble substances.

Question 2

A red blood cell is placed in a solution and begins to shrink. Which of the following best explains this observation?

Accepted Answer

The cell is in a hypertonic solution, and water is leaving the cell by osmosis.

Question 3

Which organelle is primarily responsible for producing ATP through cellular respiration?

Accepted Answer

Mitochondrion

Question 4

A patient is diagnosed with a genetic disorder that affects the function of lysosomes. Which of the following cellular processes is most likely to be impaired?

Accepted Answer

Digestion of cellular debris and worn-out organelles

Question 5

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules from high to low concentration through a membrane protein, without ATP

Question 6

During which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 7

A scientist observes a cell with condensed chromosomes aligned at the cell's equator and spindle fibers attached to the centromeres. Which stage of mitosis is being observed?

Accepted Answer

Metaphase

Question 8

Which of the following is a function of cellular adhesion molecules (CAMs)?

Accepted Answer

They guide white blood cells to sites of injury or infection.

Question 9

Which of the following best explains why cells are small and have a high surface area to volume ratio?

Accepted Answer

To allow for more efficient exchange of materials with the environment

Question 10

A cell is observed to engulf a bacterium by surrounding it with its membrane and forming a vesicle. Which process is being described?

Accepted Answer

Phagocytosis

Question 11

Which of the following equations correctly represents the osmotic pressure ($$\Pi) $$generated by a solution, according to van't Hoff's law?

Accepted Answer

$$\Pi = iMRT$$

Question 12

Which of the following best describes the role of the Na$$^+/K$^+$$ ATPase pump in the cell membrane?

Accepted Answer

It uses ATP to move Na$$^+$$ out of the cell and K$$^+$$ into the cell against their concentration gradients.

Question 13

A cell is exposed to a toxin that disrupts microtubule formation. Which of the following cellular structures would be most directly affected?

Accepted Answer

Cilia and flagella

Question 14

Which of the following is a characteristic of cancer cells that distinguishes them from normal cells?

Accepted Answer

They lose specialized characteristics and can metastasize.

Question 15

Which process involves the movement of water across a selectively permeable membrane from a region of low solute concentration to a region of high solute concentration?

Accepted Answer

Osmosis

Question 16

A cell is placed in a hypotonic solution. What is the most likely outcome for the cell?

Accepted Answer

It will gain water and swell.

Question 17

Which of the following best describes apoptosis?

Accepted Answer

Programmed cell death that is a normal part of development

Question 18

Which of the following is true regarding stem cells?

Accepted Answer

They can divide to produce either more stem cells or progenitor cells.

Question 19

Which of the following best explains why the loss of tumor suppressor gene function can lead to cancer?

Accepted Answer

It removes the normal inhibition of mitosis, allowing uncontrolled cell division.

Question 20

A cell is observed to secrete large amounts of a protein hormone. Which organelle would you expect to be especially well-developed in this cell?

Accepted Answer

Rough endoplasmic reticulum

Cell Structure and Function: Foundations of Anatomy & Physiology

Guida di studio - Domande di pratica

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