Question 1

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

Accepted Answer

A dynamic structure where proteins and lipids can move laterally within a double layer of phospholipids.

Question 2

Which of the following factors would most likely increase the fluidity of a cell membrane?

Accepted Answer

Increasing the proportion of unsaturated fatty acids in phospholipids.

Question 3

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

Accepted Answer

Water will move out of the cell, causing it to shrink.

Question 4

Which of the following best explains why passive transport does NOT require ATP?

Accepted Answer

It relies on the random kinetic energy of atoms and molecules.

Question 5

Which process is responsible for the movement of oxygen from the alveoli into the blood in human lungs?

Accepted Answer

Simple diffusion

Question 6

Which of the following is TRUE about facilitated diffusion?

Accepted Answer

It uses membrane proteins to help molecules move down their concentration gradient.

Question 7

A plant cell is placed in distilled water. What will happen to the cell, and why?

Accepted Answer

It will become turgid because water enters the cell by osmosis.

Question 8

Which of the following best describes the role of membrane carbohydrates?

Accepted Answer

They serve as recognition sites for cell-cell interactions.

Question 9

Which equation correctly represents the net movement of water during osmosis?

Accepted Answer

$$\Psi_{water}$$ moves from high to low water potential$

Question 10

Which of the following statements about active transport is correct?

Accepted Answer

It requires energy, often in the form of ATP, to move molecules against their concentration gradient.

Question 11

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

Accepted Answer

A white blood cell engulfing a bacterium.

Question 12

Which of the following best explains selective permeability of the cell membrane?

Accepted Answer

The membrane allows some substances to pass while blocking others based on size, charge, and polarity.

Question 13

Which of the following transport mechanisms is most likely used for the uptake of large molecules such as proteins into a cell?

Accepted Answer

Endocytosis

Question 14

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

Accepted Answer

Providing energy for cellular respiration

Question 15

Which process is described by the equation $$J = -D \frac{dC}{dx}$$, where $$J is $$the flux, $$D is $$the diffusion coefficient, and $$\frac{dC}{dx} is $$the concentration gradient?

Accepted Answer

Simple diffusion

Question 16

A cell uses ATP to pump sodium ions out and potassium ions in. Which type of transport is this?

Accepted Answer

Active transport

Question 17

Which of the following best describes exocytosis?

Accepted Answer

The release of substances from a cell by fusion of a vesicle with the plasma membrane.

Question 18

Which of the following is a correct statement about the three types of endocytosis?

Accepted Answer

Phagocytosis engulfs large particles, pinocytosis takes in fluids, and receptor-mediated endocytosis is highly specific.

Question 19

Which of the following would most likely decrease the rate of diffusion across a cell membrane?

Accepted Answer

Decreasing the surface area of the membrane.

Question 20

A patient is given an intravenous solution that is hypotonic compared to their blood plasma. What is the most likely effect on their red blood cells?

Accepted Answer

The cells will burst due to water influx.

Chapter 7 STUDY GUIDE - Cell Membrane Structure and Transport Mechanisms

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