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1. THE QUESTION
How do materials get into and
out of a cell?
Even though they are very tiny, cells
are complex living things. Cells
must send out signals to
communicate with other cells and
bring in nutrients from the outside
world.
http://www.media.nih.gov/imagebank/display_search.aspx?id=652
Today you will answer the question
above by exploring features of the
cell membrane that allow it to act
as a semi-permeable barrier. You
will discover how the cell
membrane helps the cell maintain
homeostasis.
http://www.media.nih.gov/imagebank/display_search.aspx?id=636
Photos from NIH Image Bank
These materials are © 2012 K Maddox, Dulaney High School, all rights reserved.
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2. INFORMATION SOURCES
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Let’s get started!
Use the following resources to help you
become familiar with the construction of
the cell membrane:

1.
2.
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1.
2.
3.
Cell Membrane
Play the animation to see an overview of the cell membrane.
Step through the animation a SECOND time. As you do,
draw the cell membrane in your notebook and label ALL of
the parts.
Phospholipids
At this point you have discovered that one of the major
components of the cell membrane are phospholipids.
Draw a phospholipid in your notebook.
Label the hydrophilic and hydrophobic sections.
Test yourself:
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Visit the page, Construction of the Cell Membrane and click
NEXT to go through each of the slides.
As you work, match the membrane parts with their
functions below. (record these in your notebook)
When you reach the
questions, make sure that you • Glycoprotein
have answered all 10 correctly
• Channel Protein
before moving forward.
• Pore Protein
• Fibrous (Integral)
• Cholesterol
Parts
http://www.media.nih.gov/imagebank/display_search.aspx?id=638
1. Allow ions and other polar molecules to pass through the membrane
2. Only found in animal cell membranes
3. Span the entire membrane and serve as a receptor for the cell.
4. Found on the surface of the membrane, they help identify the cell
5. Allow water molecules to pass through the membrane
Functions
These materials are © 2012 K Maddox, Dulaney High School, all rights reserved.
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3. TYPES OF TRANSPORT
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There two main ways that cells move materials in and out through the membrane!
Some ways require energy and others do not. Compare Active and Passive transport of
materials using the resources indicated below.
HINT! If you right-click on the animations as they are playing you can un-check
PLAY to stop and record information in your notebook.
Passive Transport
Active Transport
1. What is passive transport?
1. What is active transport?
2. What are the three forms of passive transport?
a) O_________
2. What are examples of active transport?
b) D_________
c) F__________ D__________
•
3. Compare the molecules that can get through the
membrane in passive transport to those that cannot.
Watch this animation to see two types of active
transport in action.
3. What are these two types called?
4. How are they similar?
5. How do they differ?
4. What is a concentration gradient? Watch this
animation if you need a hint.
6.
How do molecules move, relative to the
concentration gradient, in active transport?
These materials are © 2012 K Maddox, Dulaney High School, all rights reserved.
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4. THE ASSESSMENT: CREATE A VENN DIAGRAM
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2.
Create a Venn Diagram in your notebook (or using this
Venn Diagram maker) that compares Active and Passive
transport of materials across a cell membrane.
1.
Show which processes do and do not use energy.
2.
Indicate which direction molecules move relative to
the concentration gradient for each type of
transport.
3.
Give examples of each type of transport.
Check the rubric to be sure you have included all of the
important details.
Passive
Transport
http://www.media.nih.gov/imagebank/display.aspx?ID=113
These materials are © 2012 K Maddox, Dulaney High School, all rights reserved.
Active
Transport
5. ENRICHMENT ACTIVITIES
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If you have finished early, you can explore active and passive transport in a
little more detail and answer the questions below to earn some extra
points.
http://www.media.nih.gov/imagebank/display_search.aspx?id
=111
Here are some web resources that may
help you find answers to these
questions:
BrainPop for Active transport
BrainPop for Passive transport
Osmosis
You can also go back to the resources from
the previous slides for more links.
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Copy the box below onto your paper and draw a
concentration gradient, where the concentration of
molecules on the left is greater than that on the right.
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When, if ever, does diffusion of molecules end?
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Why is facilitated diffusion needed?
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What is the difference between a hypertonic and
hypotonic solution?
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What is an isotonic solution?
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If a cell is placed in an isotonic medium, will there be
net movement of water?
http://www.media.nih.gov/imagebank/display_search.aspx?id=765
These materials are © 2012 K Maddox, Dulaney High School, all rights reserved.
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6. TEACHER SUPPORT MATERIALS
Teacher notes:
This lesson is appropriate for the Cellular Biology
Unit of the BCPS High School Biology curriculum.
Students should be able to complete the activity
in pairs during one or two class periods.
Student computers will need access to the
websites and animations linked in this
presentation.
Maryland State Curriculum Goal:
Expectation 3.2
The student will demonstrate an understanding
that all organisms are composed of cells which
can function independently or as part of
multicellular organisms.
Indicator
3.2.1 The student will explain processes and the
function of related structures found in
unicellular and multicellular organisms.
Assessment limits:

Objective:
Students will analyze parts of the cell membrane
in order to identify structures involved in and
characteristics of passive and active transport of
materials in and out of living cells.
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transportation of materials (role of cellular
membranes; role of vascular tissues in plants
and animals; role of circulatory systems)
waste disposal (role of cellular membrane; role
of excretory and circulatory systems)
feedback (maintaining cellular and organismal
homeostasis - water balance
All images from NIH Image Bank
These materials are © 2012 K Maddox, Dulaney High School, all rights reserved.
Rubric
Venn Diagram Scoring Rubric
Venn Diagram: Cell Membrane
and Transport of Materials
Teacher Name: Ms Maddox
Points
Points
Points
Points
CATEGORY
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Venn Diagram- Overall
All aspects of Active and Passive
transport are clearly indicated in the
Venn Diagram. Diagram is clear and
organized.
One or two terms
are missing.
Several important
points are missing
and no comparison
of similarities is made.
Venn Diagram is
unorganized and
difficult to read.
Two errors.
Energy is not addressed
in the Venn Diagram
Several errors in
movement of
molecules.
Movement of molecules
relative to concentration
gradient is not
addressed.
Energy
Direction of molecule
movement
Examples
Energy for Active and Passive transport One error in the
is addressed correctly.
requirement for
energy.
Direction of molecule movement,
relative to the concentration gradient
is appropriately labeled.
One error in
direction of
movement.
At least two examples are given for Only 1 example is Examples for only Examples of passive and
active and passive transport.
given for each type one type of transport active transport are not
of transport.
(passive or active) are addressed in the Venn
given.
Diagram.
These materials are © 2012 K Maddox, Dulaney High School, all rights reserved.