Bozeman : Transport Across the
Membrane
10 questions
If you took notes you are welcome to
use them.
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Brain pop
• User name: Aldine
• Password: Brain pop
• Watch: Diffusion
•
Passive Transport
2
• 1. Name one biomolecule
that makes up the cell
membrane?
• 2.
3
• 3. True or False:
• Passive transport uses no
energy to move small
particles with no charge
through the cell
membrane.
• 4. Which type of passive
transport is the diffusion
of water?
• A. Facilitated diffusion
• B. Osmosis
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• 5. There are three types
of osmosis. List one type
• 6. True or False
• Active transport uses
proteins to move larger
particles through the cell
membrane by exocytosis
and endocytosis.
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• 7. Diffusion moves
particles from……
• 8. List a human body
system that relies
heavily on diffusion.
• A. High to low
concentration
• B. Low to high
concentration
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• 9. True or False
• 10. The picture below is an
example of
• A selectively permeable
cell membrane lets
particles move freely in
and out of the cell.
• A. Phagocytosis
• B. Pinocytosis
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Bozeman : Cell Membranes
5questions
If you took notes you are welcome to
use them.
8
• 1. What is the main
biomolecule found in the
cell membrane?
• 2. True or False
• The cell membrane is
considered fluid,
which means it moves
like water.
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• 3. The cells can signal
each other as if they could
communicate.
• 4. The head of the
phospholipid is polar
or has a charge?
• True or False
• True or False
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• 5. Proteins move large particles through the cell
membrane.
• True or False
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Cell structures
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12
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Cell membrane notes
• Question
•
• What are the functions of the cell
membrane?
• What does selective mean?
• What does permeable mean?
• What does selectively permeable
mean?
• What is impermeable?
• What biomolecules make up the
cell membrane?
Answer
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What is the function of the cell
membrane?
•
•
•
•
•
1. It protects the cell.
2. It lets things in and out of the cell.
3. Maintains homeostasis (balance).
4. Transmits signals
through out the cell.
15
Where is the cell membrane
located? Is is the layer around
the cell.
Magnified to see
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The cell membrane is selectively
permeable, what does this mean?
• The word selective means
“picky” or choosey.”
• The word permeable
means letting things go in
and out.
• Just like the colander lets
the water out but not the
noodles.
• Impermeable means
nothing is going in or out
of the membrane.
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Fluid mosaic model
(Cell Membrane)
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The cell membrane is made up of
two layers of fat (phosopholipids)
• It contains two parts:
• The hydrophilic (waterloving) polar
•
• The hydrophobic (waterdislike) tails are nonpolar
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• Question
• Answer
• What is passive transport?
• give two examples
• What is active transport?
•
give two examples
• We are going to draw a
picture to illustrate
passive and active
transport. (give a
handout)
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What does the word
concentration mean?
• It means that there is a
high volume of the
substance.
• For example: When
you buy orange juice
from concentrate
where is there a high
volume of OJ in or out
of the tube?
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•
There are two different ways
particles move across the cell
membrane.
Passive Transport
• * No energy needed
to move particles from
an area of high to low
concentration.
• Examples are
diffusion, osmosis,
and facilitated
diffusion.
•
Active Transport
• * Energy needed to
move particles from
an area of low to high
concentration.
• Examples:
endocytosis and
exocytosis.
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Active or Passive?
A
B
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Passive transport includes
diffusion.
• It is when particles
move from an area of
high concentration to
low concentration not
using energy.
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Facilitated Diffusion uses proteins to help the
membrane move large substances in and out
of the membrane.
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Passive transport also includes
osmosis.
• Osmosis is a type
diffusion (moving
substances from an
area of high to low
concentration, not
using energy) but
using WATER!!
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• Question
What is a solution?
• Answer
Three types of Osmosis!
• What is a isotonic?
• What is a hypertonic?
• What is a hypotonic?
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What is a solution?
• Solute = Is the stuff
• Solvent = Water
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What is isotonic?
• Isotonic means the
same amount of
“STUFF.” No change
is seen in the cell.
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What is hypertonic?
• Hypertonic is more
“STUFF.” This causes
the cell to shrink.
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What is hypotonic?
• Hypotonic means less
stuff. This causes the
cell to get larger or
swell.
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Is the cell hypertonic, hypotonic, or
isotonic and how will water move?
A.
32% water
68% stuff
Solution is hypertonic
When solving osmosis
problems first find out if
they are asking about the
cell or the solution.
Confusing right!! Here is a
hint. The arrow always
moves to hypertonic.
32% salt
68% water
Cell is hypotonic
Lets work some problems
together.
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Osmosis Lab
• There are 14 stations with 41 questions.
• You must label the station and answer the
questions at each station. If drawing is asked
then do so please!
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Station 1
• Answer the 3
questions
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What is surface tension?
• Milk is mostly water, and water
has a property called surface
tension, this is because all the
water molecules are strongly
attracted to other water molecules,
but not to air, so they try to get
away from the surface of the drop,
making the surface as small as
possible, this is why raindrops are
approximately spherical - the
shape with the least surface for its
volume.
• This means that the surface of
water, or milk, is always trying
to shrink.
35
Psychedelic Milk
• Dishwashing liquid is
designed to break up the
surface tension so water
can dissolve fats and
grease. This means that
where you add the
washing up liquid the
surface tension is much
weaker than everywhere
else, so this surface gets
hugely stretched by the
milk which hasn't met the
washing up liquid yet.
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Psychedelic Milk
• Why does washing up liquid
reduce surface tension?
• A washing up liquid molecule is
made up of a water loving head
and a water hating tail, so when
you add it to water the molecules
arrange themselves over the
surface - head inwards. The water
is strongly attracted to the heads of
these molecules, so is now stops
trying to reduce its surface area,
and the surface tension is far
weaker.
•
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The second type of transport is
ACTIVE TRANSPORT.
• This type of transport needs
energy to move substances
through the cell membrane
from an area of low to high
concentration.
• LETS LOOK AT A FEW
EXAMPLES!
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ENDOCYTOSIS= Into cell
• Endocytosis is the
movement of a particle
inside the cell
membrane using
energy.
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EXOCYTOSIS= out of cell
• Exocytosis is the
moving of particles
outside of the cell
using energy.
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Which is which???
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Active transport is a process
where energy is used! Why?
• Active transport needs
energy because it has
to move substance
from an area of low to
high concentration.
• It kind of has to shove
the stuff in or out!
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Cell Membrane lab (12 stations)
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Notebook
•
•
•
•
Animal and Plant cell notes and drawings
Cell membrane notes
Dot problems
Beaker problems.
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