Question 1

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

Accepted Answer

It creates a selectively permeable barrier, allowing some substances to cross while restricting others.

Question 2

A patient is given an intravenous solution that is hypotonic relative to their blood plasma. Which process will primarily occur in their red blood cells?

Accepted Answer

Osmosis of water into the cells, causing them to swell.

Question 3

Which of the following best distinguishes between primary and secondary active transport?

Accepted Answer

Primary active transport uses ATP directly, while secondary active transport uses the energy from an ion gradient established by primary active transport.

Question 4

Which equation best represents the net movement of water during osmosis across a semipermeable membrane?

Accepted Answer

$$J = -L_p (\Delta P - \sigma \Delta \pi)$$

Question 5

A cell engulfs a bacterium by wrapping its plasma membrane around it and internalizing it in a vesicle. This process is best described as:

Accepted Answer

Phagocytosis

Question 6

Which of the following is a key difference between simple diffusion and facilitated diffusion?

Accepted Answer

Facilitated diffusion requires a membrane protein, while simple diffusion does not.

Question 7

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

Accepted Answer

Mitochondrion

Question 8

A mutation disrupts the function of ribosomes in a cell. Which process will be most directly affected?

Accepted Answer

Protein synthesis

Question 9

Which of the following best describes the function of peroxisomes?

Accepted Answer

They break down fatty acids and detoxify harmful substances.

Question 10

Which cytoskeletal element is primarily responsible for maintaining cell shape and resisting tension?

Accepted Answer

Intermediate filaments

Question 11

A researcher observes a cell with numerous cilia on its surface. What is the most likely function of these cilia?

Accepted Answer

Moving fluid or mucus across the cell surface

Question 12

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

Accepted Answer

S phase

Question 13

Which of the following best describes the role of the nuclear envelope?

Accepted Answer

It separates the nucleus from the cytoplasm and regulates passage of materials.

Question 14

A cell is observed to be undergoing apoptosis. Which of the following best describes this process?

Accepted Answer

Programmed cell death involving controlled dismantling of cellular components.

Question 15

Which process is responsible for the degradation of misfolded or damaged soluble proteins in the cytosol, and is dependent on ubiquitin tagging?

Accepted Answer

Proteasome-mediated degradation

Question 16

Which of the following best distinguishes autophagy from apoptosis?

Accepted Answer

Autophagy recycles cellular components, while apoptosis leads to cell death.

Question 17

A cell is observed to have a high number of lysosomes. Which function is this cell most likely specialized for?

Accepted Answer

Digesting and recycling cellular waste and foreign material

Question 18

Which of the following best describes the relationship between the endoplasmic reticulum (ER) and the Golgi apparatus?

Accepted Answer

Proteins synthesized in the rough ER are transported to the Golgi apparatus for modification and sorting.

Question 19

Which of the following is a function of microvilli on the surface of epithelial cells?

Accepted Answer

Increasing the surface area for absorption

Question 20

A scientist is studying the movement of glucose into a cell. She finds that glucose moves down its concentration gradient but requires a specific membrane protein. Which transport mechanism is being observed?

Accepted Answer

Facilitated diffusion

A&P Chapter 3 Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard