Question 1

Which of the following best explains why phospholipids form bilayers in aqueous environments?

Accepted Answer

Phospholipids have hydrophilic heads and hydrophobic tails, causing them to arrange with heads facing water and tails facing inward.

Question 2

A cell is placed in a hypertonic solution. What will most likely happen to the cell?

Accepted Answer

Water will leave the cell, causing it to shrink.

Question 3

Which equation correctly represents the calculation of the concentration of a solution?

Accepted Answer

$$C = \frac{n}{V}$$

Question 4

Which type of membrane transport requires energy input from the cell?

Accepted Answer

Active transport

Question 5

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

Accepted Answer

The cell will gain water and become turgid.

Question 6

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

Accepted Answer

Producing ATP for cellular energy

Question 7

Which process involves the movement of molecules from an area of high concentration to an area of low concentration without the use of energy?

Accepted Answer

Facilitated diffusion

Question 8

Which specialized junction allows direct communication between adjacent animal cells?

Accepted Answer

Gap junctions

Question 9

If a cell needs to import large particles such as bacteria, which process will it most likely use?

Accepted Answer

Phagocytosis

Question 10

Which statement best describes the role of recognition proteins in the cell membrane?

Accepted Answer

They identify the cell to other cells and help in immune responses.

Question 11

A solution with a higher concentration of solute outside the cell than inside is called:

Accepted Answer

Hypertonic

Question 12

Which of the following best describes the function of tight junctions?

Accepted Answer

They make cell attachments leakproof.

Question 13

Which of the following is true about facilitated diffusion?

Accepted Answer

It uses channel or carrier proteins to move molecules down their concentration gradient.

Question 14

Which formula represents the rate of diffusion according to Fick's Law?

Accepted Answer

$$J = -D \frac{dC}{dx}$$

Question 15

Which of the following is a real-life example of osmosis?

Accepted Answer

Water moving into a raisin placed in pure water

Question 16

Which statement about membrane proteins is correct?

Accepted Answer

Carrier proteins bind specific molecules and transport them across the membrane.

Question 17

Which process is responsible for the expulsion of waste materials from a cell?

Accepted Answer

Exocytosis

Question 18

A cell membrane is described as 'selectively permeable.' What does this mean?

Accepted Answer

The membrane allows some molecules to pass while blocking others.

Question 19

Which of the following is a function of enzymes found in the cell membrane?

Accepted Answer

They promote chemical reactions at the membrane surface.

Question 20

Which of the following statements about plasmodesmata is correct?

Accepted Answer

They link the insides of adjacent plant cells for direct communication.

Cell Membrane Structure, Function, and Transport Mechanisms

Study Guide - Practice Questions