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Review: Remember Chemistry What does polar mean? Polar means a molecule has a positive and negative end How do polar molecules behave? (“like dissolves like”) Polar molecules attract to other polar molecules Polar molecules do not attract nonpolar molecules.
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CELL MEMBRANE
How is the environment connected to the Cells?
Video
Review: Remember ChemistryWhat does polar mean?
Polar means a molecule has a positive and negative end
How do polar molecules behave?• (“like dissolves like”)
Polar molecules attract to other polar molecules• Polar molecules do not
attract nonpolar molecules.
Basic Structure
What do you need to know?
Phospholipids• arranged in a double layer called a bilayer.• Phospholipids are polar molecules. • Positive
(hydrophilic = water loving) : head
• Negative (hydrophobic = water hating) : tail
Cell FunctionWhat do cells need to get in and out to function
properly? Molecules:
CO2 (Carbon Dioxide) = Nonpolar, small molecule O2 (Oxygen) = Nonpolar, small molecule H2O (Water) = Polar, small molecule C6H12O6 (sugars/glucose) = Nonpolar, large molecules Amino Acids (building block of proteins) = typically Nonpolar,
large molecules Nucleic Acids (building blocks of DNA) = typically Nonpolar,
large molecule Lipids (Called fatty acids) = typically Nonpolar, large molecule Ions = Charged molecules that need to get into or out of the cell
Learn
Pair
Share
Jig-saw: Cell Membrane Function
6 ways molecules move 1. Diffusion (p. 74-75)2. Osmosis (p. 76-77)3. Facilitated Diffusion (p.
80)4. Sodium-Potassium Pump
(p. 81-82)5. Endo- & Exocytosis (p.
83)6. Membrane Receptor
Proteins (p. 84-86)
Assignment:1. Class number off 1
through 6.2. ID specific
responsibilities based on your number.
3. Read the text Take notes on what is
the important must knows.
Jig-saw: Cell Membrane Function
6 ways molecules move 1. Diffusion (p. 74-75)2. Osmosis (p. 76-77)3. Facilitated Diffusion (p.
80)4. Sodium-Potassium Pump
(p. 81-82)5. Endo- & Exocytosis (p.
83)6. Membrane Receptor
Proteins (p. 84-86)
Assignment:4. Get in to groups based
on your assigned number. Discuss the must knows from the reading.
5. Each member draw a picture expressing the must knows. “No Words”
6. Plus discuss a real world application of this process.
Jig-saw: Cell Membrane Function
6 ways molecules move 1. Diffusion (p. 74-75)2. Osmosis (p. 76-77)3. Facilitated Diffusion (p.
80)4. Sodium-Potassium Pump
(p. 81-82)5. Endo- & Exocytosis (p.
83)6. Membrane Receptor
Proteins (p. 84-86)
Assignment:7. Get into groups with
people of your non number. We are going to go with 5 groups.
8. Teacher/student Each person is
responsible for teaching their part.
Everyone is taking notes and copying the illustration.
Lab
Experiment 11. Fill sandwich bag with 20
mL of Iodine rap rubber band around opening
2. Fill plastic cup w/ 20 mL of Starch solution.
3. Place bag in beaker so opening is outside the beaker
4. Let stand until next class
Experiment 21. Fill sandwich bag with 20
mL of Starch solution rap rubber band around opening
2. Fill plastic cup w/ 20 mL of Iodine.
3. Place bag in beaker so opening is outside the beaker
4. Let stand until next class
Obtain…1. 2 sandwich bags2. 2 plastic cups3. 2 rubber bands
Iodine/Starch Lab Observations Draw a picture of the before and after for
each experiment. Write a TELL-Con about the experiment.
Answer the questions has evidence. Do both molecules move through the bag? What is it about the structure of a each molecule
that determine whether of not it move through the bag?
I2 Starch = Several glucose (C6H12O6) molecules attached to
one another What molecule(s) moves into the bag and why?
What are the keys to getting across the cell membrane?
Size Polarity Concentration
Vocabulary that is good to know Solution
Solute (sugars or salts) Solvent (water)
Concentration Gradient If there is a lot of solute = high concentration If there is little solute = low concentation
If you move with the concentration gradient High Low If you move against the concentration gradient Low
High When the concentrations are equal we call that
equalibrium.
Passive v. Active Transport Passive Transport
No energy needed Moves with the concentration gradient
Active Transport Requires energy Moves against concentration gradient
Let’s start with Nonpolar, Small molecules
Diffusion Passive Transport Movement of
molecules from a high concentration to a low concentration. Ex. A Fart!
With the cell membrane diffusion occurs through phospholipids
Let’s talk about water(Nonpolar, small molecules)
Osmosis Passive Transport Movement of water
from a high concentration to a low concentration. Ex. Bounty paper
towel Water move through
the phospholipids
Terms to know about Osmosis
Hypotonic The lower
concentration of solute
Hypertonic The high
concentration of solute
Isotonic Concentration of
solute is equal on both sides
Link to Animationhttp://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_osmosis_works.html
Write TELL-Con on Egg Demo Use the information learned over the
past two slides to answer what happens in the Egg Demo.
Let’s talk about Large molecules moving with concentration gradient
Facilitated Diffusion
Passive Transport
Because it is a large molecule it will need an opening to get through. A carrier protein.
Link to Animationhttp://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_facilitated_diffusion_works.html
Ion Channel TransportIons (charged
molecule) Passive Transport
Special channel needed to get charged molecules into and out of the cell with the concentration gradient
Click Here for Animation
Let’s talk about movement against the concentration gradient.
Active Transport Needs Energy
Need to know the sodium/potassium
Link to Animationhttp://www.brookscole.com/chemistry_d/templates/student_resources/shared_resources/animations/ion_pump/ionpump.html
Receptors Proteins
Click here for video
Form of active transport
Endo- and ExocytosisPassive transport Endo- = “in” Exo- = “out”
cyto- = “cell”
-osis = “process”
What is Endocytosis?What is Exocytosis?
Click here for animationhttp://www.maxanim.com/physiology/Endocytosis%20and%20Exocytosis/Endocytosis%20and%20Exocytosis.htm
Cell Transport
Click here for the video!