Question 1

Which of the following best describes the fluid mosaic model of the plasma membrane?

Accepted Answer

A dynamic structure with a mosaic of phospholipids, cholesterol, proteins, and carbohydrates that gives the membrane fluidity.

Question 2

Which component of the plasma membrane is primarily responsible for cell-cell recognition and attachment?

Accepted Answer

Carbohydrates

Question 3

A cell is placed in a solution and water begins to leave the cell, causing it to shrink. Which term best describes the solution?

Accepted Answer

Hypertonic

Question 4

Which of the following molecules can most easily diffuse through the plasma membrane without the help of a transport protein?

Accepted Answer

O$$_2$$

Question 5

Which of the following statements about membrane fluidity is correct?

Accepted Answer

Membrane fluidity is maintained by cholesterol, which acts as a buffer against temperature changes.

Question 6

Which type of membrane protein is most likely to function as a receptor for signaling molecules?

Accepted Answer

Integral protein

Question 7

A glucose molecule moves into a cell down its concentration gradient via a specific protein that changes shape during transport. This is an example of:

Accepted Answer

Facilitated diffusion via a carrier protein

Question 8

Which of the following best explains why animal cells function best in isotonic solutions?

Accepted Answer

There is no net movement of water, maintaining cell shape and function.

Question 9

Which of the following is a correct description of primary active transport?

Accepted Answer

It uses ATP to move molecules against their concentration gradient.

Question 10

The Na$$^+/K$^+$$ pump moves 3 Na$$^+$$ ions out of the cell and 2 K$$^+$$ ions into the cell using ATP. What type of transporter is this?

Accepted Answer

Antiporter

Question 11

Which process is used by white blood cells to engulf bacteria?

Accepted Answer

Phagocytosis

Question 12

A cell uses a vesicle to export large quantities of hormones into the bloodstream. This process is called:

Accepted Answer

Exocytosis

Question 13

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

Accepted Answer

It acts as a fluidity buffer, stabilizing the membrane at different temperatures.

Question 14

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

Accepted Answer

Synthesizing proteins for the cell

Question 15

Which of the following statements about osmosis is correct?

Accepted Answer

Water moves from an area of high water concentration to low water concentration.

Question 16

A patient with cystic fibrosis has thick, sticky mucus in their lungs. This is primarily due to a defect in which type of membrane protein?

Accepted Answer

A chloride ion channel

Question 17

Which of the following best explains why glucose cannot cross the plasma membrane by simple diffusion?

Accepted Answer

It is a large, polar molecule and requires a transport protein.

Question 18

Which of the following is an example of secondary active transport?

Accepted Answer

Glucose entering a cell using the Na$$^+$$ gradient established by the Na$$^+/K$^+$$ pump.

Question 19

Which of the following statements about facilitated diffusion is correct?

Accepted Answer

It uses membrane proteins to move substances down their concentration gradient.

Question 20

Which of the following best describes receptor-mediated endocytosis?

Accepted Answer

The cell selectively takes in specific molecules after they bind to receptors on the membrane.

Plasma Membrane Structure and Transport Mechanisms

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