Name______________________________ Class __________________ Date ______________

Reading Guide

Section 73 Cell Transport (pages 208213)

This section describes the main functions of the cell membrane. It also

explains what happens during diffusion and explains what osmosis is.

They are made mostly of cellulose.

Passive Transport

1.     Name the three types of passive transport?


2.     What is diffusion?



3.      The molecules of solute in the illustration are moving through the cell membrane from

top to bottom. Indicate with labels which side of the membrane has a high concentration of solute and which has a low concentration.




4.      What happens to the particles in a solution during equilibrium?


5.      What is passive transport?



6.      What is the role of protein channels in the cell membrane?



7.      What happens during the process of facilitated diffusion?



8.       Is the following sentence true or false? Facilitated diffusion does not require the cell to

use energy. ______


9.      Why does water have a tough time passing through the cell membrane?



10.  Water channel proteins are known as _______________________________________.



11.  What is the definition of osmosis?



12.   Is the following sentence true or false? Water tends to diffuse from a region where it is

less concentrated to a region where it is highly concentrated. ______


It will

Match the situation to the description.

Situation                                                         Description


______13. Two solutions are isotonic.           a. The solution is above strength in solute.


______14. A solution is hypertonic.               b. The solutions are the same strength.


______15. A solution is hypotonic.                c. The solution is below strength in solute.


16.  Describe what causes osmotic pressure?



17.  For each of the red blood cells below, draw an arrow showing the net movement of water into or out of the cell and label the type of solution the red blood cell is in.

It exerts a pressure on the hypertonic side.


Type of solution:   _______________   _____________   ______________


Active Transport

18.  The energy-requiring process that moves material across a cell membrane against a

concentration difference is called ___________________________________________.


19.  Is the following sentence true or false? Active transport requires transport proteins or protein pumps during the process. ______


20.  What happens to a protein pump to allow it to pump molecules across the cell membrane?


21.  Complete the table about types of active transport.





Endocytosis Process












22.  During endocytosis, what happens to the pocket in the cell membrane when it breaks

loose from the membrane? It

Section 74 Homeostasis and Cells (pages 214217)

This section explains what cell specialization is. It also describes the four levels of organization in multicellular organisms.

The Cell as an Organism

23.  A single-celled organism is also called a(an) ________________________organism.


24.  What are some ways that unicellular organisms maintain homeostasis?



25.  Give an example of a unicellular, prokaryotic organism.



26.  Give two examples of a unicellular, eukaryotic organisms.


Multicellular Life

27.  What are some ways that multicellular organisms maintain homeostasis?




28.  What is cell specialization in a multicellular organism?




29.   Circle the letter of each sentence that is true about cell specialization.

a.      Specialized cells perform particular functions within the organism.

b.      Only unicellular organisms have specialized cells.

c.       The human body contains many different cell types.

d.      Some cells are specialized to enable movement.


30.  What are four levels of organization in a multicellular organism? (simplest to most complex)






31.  What is a tissue?



32.  Groups of tissues that work together to perform a specific function are called a (an) ________________________________________________________.


33.  What is an organ system?



34.  How do cells in large organisms communicate?



35.  What is a receptor and how does a receptor work?