Question 1

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

Accepted Answer

A dynamic bilayer of phospholipids with proteins drifting laterally and carbohydrates attached to some proteins and lipids.

Question 2

Which component of the plasma membrane is primarily responsible for its selective permeability?

Accepted Answer

Phospholipid bilayer

Question 3

Refer to the third image (sodium-potassium pump). What is the main function of the sodium-potassium pump in animal cells?

Accepted Answer

To maintain a higher concentration of sodium ions outside the cell and potassium ions inside the cell using ATP

Question 4

Which of the following statements about membrane fluidity is correct?

Accepted Answer

Phospholipids with unsaturated hydrocarbon tails increase membrane fluidity.

Question 5

In the fifth image (beaker with cell), which direction will glucose move by diffusion?

Accepted Answer

Glucose will move from the cell into the environment.

Question 6

Which of the following best explains why a red blood cell bursts in a hypotonic solution but a plant cell does not?

Accepted Answer

Plant cells have a cell wall that prevents excessive expansion.

Question 7

Which process is illustrated in the fourth image (membrane transport with ATP symbol)?

Accepted Answer

Active transport

Question 8

Which of the following is a function of glycoproteins in the plasma membrane?

Accepted Answer

Acting as identification tags for cell-cell recognition

Question 9

A cell is placed in a solution and water moves into the cell, causing it to swell. Which term best describes the solution?

Accepted Answer

Hypotonic

Question 10

Which of the following statements about facilitated diffusion is correct?

Accepted Answer

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

Question 11

Which of the following is an example of bulk transport?

Accepted Answer

Endocytosis

Question 12

What is the main difference between channel proteins and carrier proteins?

Accepted Answer

Channel proteins form hydrophilic tunnels, while carrier proteins change shape to move substances across the membrane.

Question 13

Which of the following best describes cotransport?

Accepted Answer

The coupling of the downhill diffusion of one substance to the uphill transport of another.

Question 14

Which equation best represents the electrochemical gradient?

Accepted Answer

$$E = E_{chemical} + E_{electrical}$$

Question 15

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

Accepted Answer

Storage of genetic information

Question 16

Which of the following best explains why cholesterol is important in animal cell membranes?

Accepted Answer

It stabilizes membrane fluidity across temperature changes.

Question 17

Which process is responsible for the uptake of cholesterol into animal cells?

Accepted Answer

Receptor-mediated endocytosis

Question 18

A plant cell placed in a hypertonic solution will:

Accepted Answer

Become flaccid and undergo plasmolysis

Question 19

Which of the following best describes the role of aquaporins?

Accepted Answer

They facilitate the passive diffusion of water across the membrane.

Question 20

Which of the following is true regarding the movement of oxygen ($$O_2) $$across the plasma membrane?

Accepted Answer

It moves by simple diffusion through the lipid bilayer.

Membrane Structure and Function (8/16/26)

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