Question 1

Which of the following best describes the fluid mosaic model of biological membranes?

Accepted Answer

A double layer of phospholipids with proteins embedded and moving within the layer.

Question 2

Which of the following molecules can most easily diffuse across a biological membrane's lipid bilayer without the help of a protein?

Accepted Answer

$$	ext{O}_2$$

Question 3

A cell is placed in a solution with a higher solute concentration than inside the cell. What will happen to the cell?

Accepted Answer

The cell will shrink.

Question 4

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

Accepted Answer

DNA replication

Question 5

Which statement best describes facilitated diffusion?

Accepted Answer

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

Question 6

What is the main difference between primary and secondary active transport?

Accepted Answer

Primary active transport uses ATP directly, while secondary active transport uses a concentration gradient.

Question 7

Which of the following best describes osmosis?

Accepted Answer

Movement of water molecules across a semi-permeable membrane from low to high solute concentration.

Question 8

A sodium-potassium pump is an example of which type of membrane transport?

Accepted Answer

Primary active transport

Question 9

Which of the following is true about passive transport across a membrane?

Accepted Answer

It moves substances down their concentration gradient.

Question 10

Which type of endocytosis involves the cell membrane engulfing large solid particles, such as bacteria?

Accepted Answer

Phagocytosis

Question 11

Which of the following best describes a symporter?

Accepted Answer

A protein that transports two different molecules in the same direction.

Question 12

Which of the following is NOT a characteristic of simple diffusion?

Accepted Answer

Requires a membrane protein.

Question 13

What is the effect on a plant cell placed in a hypotonic solution?

Accepted Answer

The cell becomes turgid.

Question 14

Which of the following statements about exocytosis is FALSE?

Accepted Answer

It is a form of passive transport.

Question 15

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

Accepted Answer

It makes the membrane more rigid at high temperatures and more fluid at low temperatures.

Question 16

Which of the following molecules would require a transport protein to cross the plasma membrane?

Accepted Answer

Glucose

Question 17

Which process is responsible for the uptake of specific molecules via binding to cell surface receptors?

Accepted Answer

Receptor-mediated endocytosis

Question 18

Which of the following best describes an antiporter?

Accepted Answer

A protein that transports two different molecules in opposite directions.

Question 19

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

Accepted Answer

Both move molecules down their concentration gradient.

Question 20

Which of the following is true about secondary active transport?

Accepted Answer

It uses the energy stored in a concentration gradient created by primary active transport.

Membrane Structure and Function: Study Notes

Study Guide - Practice Questions