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Biology, Friday, September 29
• On page 62 of your INB, in the top box,write the following questions on the left and answer it on the right.
What is the function of the cell
membrane?
Your Answer Here
https://www.youtube.com/watch?v=Ptmlvtei8hw
Introduction to cell membrane and transport
• On page 91 in your notebook:• Watch this video• Write down 3 interesting and
important things from the video
The Cell Theory and Membrane Transport
Page 73 Highlight with purpose:
HEADINGSIMPORTANT WORDS
VOCABULARY
THE CELL• THE FIRST PERSON
TO OBSERVE LIVING CELLS WAS A DUTCH MICROSCOPE MAKER, ANTON VAN LEEUWENHOEK (1632-1723)
THE CELL THEORY
3. CELLS COME ONLY FROM THE REPRODUCTION OF EXISTING CELLS
(cells come from othercells)
Write a question!WWrite
•You have 2 minutes to write a question on the left column of your notebook.
•Level 3 words:Apply, Build, Choose, Construct, Discover, Examine, Inspect, Group, Dinstinguish, Relationships, Conclude
EXTRA NOTES•You can put an X next to the Fluid Mosaic Model
• Take the following notes in the space on the right
12
Cell Membrane
The cell membrane is flexible.
Also known as the Plasma Membrane
copyright cmassengale
Cell Membrane
• Helps to maintain homeostasis -balance in the cell
• The plasma membrane is selectively permeable – it will control what enters and leaves the cell
MEMBRANE LIPIDS
• PHOSPHOLIPID:– HAS A POLAR HEAD– 2 NON-POLAR TAILS
(fatty acid tails)– REMEMBER: – Polar means uneven
charges– What molecule is Polar?
Draw This!
MEMBRANE LIPIDS
• PHOSPHOLIPID:– HYDROPHILIC Head=
CLOSE TO WATER AS POSSIBLE
– HYDROPHOBIC Tail = FAR AWAY FROM WATER AS POSSIBLE
Hate H2O
LIPID BILAYER
• THE CELL IS SURROUNDED BY WATER
• WATER MOLECULES ON BOTH SIDES OF THE CELL MEMBRANE
Outside of cell
Inside of cell
LIPID BILAYER
• H20 MOLECULES CAUSE THE PHOSPHOLIPIDS TO FORM 2 LAYERS…LIPID BILAYER!
• PHOSPHOLIPID HEAD FACE OUTWARD & TAILS INWARD
Write a question!WWrite
•You have 2 minutes to write a question on the left column of your notebook.
•Level 3 words:Apply, Build, Choose, Construct, Discover, Examine, Inspect, Group, Dinstinguish, Relationships, Conclude
Exit Ticket
• Explain how the structure of the phospholipid results in a lipid bilayer that makes up the plasma membrane.
(words you might use: polar,nonpolar, hydrophilic, hydrophobic)
Biology, Monday, October 2
• On page 62 of your INB, in the fourth box, write the following questions on the left and answer it on the right.
Where do cells come from?
Your Answer Here
Integral Proteins• Proteins THAT ARE EMBEDDED INTO THE
LIPID BILAYER– CAN BE EXPOSED TO THE INSIDE AND
OUTSIDE OF THE CELL
• OFTEN CARBS ATTACHED TO INTEGRAL PROTEINS
• EXPOSED TO THE EXTERNAL ENVIRONMENT• THE CARBOHYDRATES CAN:
– HOLD ADJOINING CELLS TOGETHER– ACT AS SITES WHERE VIRUSES OR CHEMICAL
MESSAGES CAN ATTACH (EX. HORMONES)• INTEGRAL PROTEINS CAN FORM CHANNELS OR
PORES • USED FOR
TRANSPORT
PERIPHERAL PROTEINS:
• LOCATED ON BOTH INTERIOR & EXTERIOR SURFACES OF THE CELL MEMBRANE
• Act as partners ofother proteins
Movement Across the MembranePassive Transport:
1. Diffusion AND 2. Osmosis• Requires No Energy• Movement of like
species from area of high concentration to low
Movement Across the MembraneActive Transport:• Movement from an area of LOW
concentration to an area of HIGHconcentration
1. Na+/K+ Pump2. Endocytosis/Exocytosis3. Requires Energy• Movement from an area of LOW
concentration to an area of HIGHconcentration
With your time left
• Complete the student choice page on p. 72 about the cell membrane
• You may not do a concept map
Closing
• Parking Lot: On a sticky note,write your name and then write:
•A question you have about the cell membrane
OR•Something you know about the cell membrane
Biology, Wed., October 4
• Staple the blank box page on top of page 62. Write the following question in the top left box and write your answer below.
Where do cells come from?
Your Answer Here
Complete Your Measurements
• Read Day 2 procedures in your lab• Remember:
– Dry off your grapes before you weigh them
– Record your data in the table– After you do your calculations, Share your percent change data with Dr. Wagner
Graphing• After you have filled out your entire data table, graph your
results. • You should make a bar graph, with the bars graphed so that
Day 1 and Day 2 for each solution are next to each other.
Complete Your Measurements
• Read Day 2 procedures in your lab• Remember:
– Dry off your grapes before you weigh them
– Record your data in the table– After you do your calculations, Share your percent change data with Dr. Wagner
Tuesday, Oct. 10 Exit Ticket
• Explain why disturbing or sabotaging another classes experiments in wrong.
• Your answer must be in complete sentences and at least 3 sentences long.
Tuesday, October 10
• In the middle top box on page 62, extra sheet, write the following question and your answer below.
Explain two differences
between active and passive transport?
Your Answer Here
p. 75
Passive Transport• Diffusion = movement of like species from
high [ ] to low [ ]. [] = concentration
Question:What’s in a Solution?
Answer:
• solute + solvent solution
• NaCl + H20 saltwater
• Kool-aid powder + H20 Kool-Aid
Facilitated Diffusion = process is used for molecules that cannot diffuse rapidly through
the cell membrane.
• Osmosis = movement of a solvent (usuallywater) from area of high[] to low [] across selectively permeable membrane
Higher Concentrationof Water
Water molecules
Lower Concentrationof Water
Sugar molecules
Thursday, October 12• In the top right box on page 62, extra sheet, write the following question and your answer below.
What is the difference
between diffusion and facilitated
diffusion?
Your Answer Here
Parking Lot Questions
• What would happen if a cell did not have active or passive diffusion?
• What is the relationship between ion channels and facilitated diffusion?
HYPOTONIC:
• [ ] of dissolved substances is lower outside cell than inside cell
• Water goes to where the particles are
• HYPO means “below strength”
• Water will move INTO cell causing it to SWELL
• HYPO-SWELL
HYPOTONIC:
• Cells could rupture if the cell takes in too much water – known as CYTOLYSIS or LYSIS
• In plant cells, this increases pressure inside of cell (TURGOR PRESSURE)
• Why?
Hypotonic•A solution with a lower solute concentrationcompared to another solution.
3% Na97% H2O
Red Blood Cell
1% Na99% H2O
solution
Which way will the water move?
• [ ] of dissolved substances is higher outside the cell, lower inside cell
• HYPER means “above strength”
• Water goes to where the particles are
• H2O rushes OUT of cell causing it to SHRIVEL or SHRINK
• HYPER-SHRINK
HYPERTONIC:
• Can result in PLASMOLYSIS in plants which causes wilting
• HYPER KIDS GO OUT TO PLAY!!!
HYPERTONIC:
Hypertonic•A solution with a greater soluteconcentration compared to another solution.
3% NaCl97% H2O
Red Blood Cell
5% NaCl95% H2O
solution
Which way will the water move?
• [ ] of dissolved substances is the same on the outside as the inside of the cell
• No net movement of water
ISOTONIC
Isotonic•A solution with an equal solute concentration compared to another solution.
3% Na97% H2O
Red Blood Cell
3% Na97% H2O
solution
Which way will the water move?
EXIT TICKET•Explain the difference between hypotonic, isotonic, and hypertonic through a thinking map (you must also include illustrations of the cell in these states)
PARKING LOT
• Put your name on a sticky note • I have a question about osmosis or diffusion…..ORI know this about diffusion/osmosis
• Put your sticky note on the PARKING LOT
Friday, October 13
• In the left box, second row, on page 62, extra sheet, write the following question and your answer below.
What is plasmolysis and cytolysis?
Your Answer Here
Active Transport• Requires both energy, in the form of ATP
(Adenosine Triphosphate), and protein pumps
• Endocytosis = the process by which cells ingest external fluid, macromolecules, and large particles.– Pinocytosis = water– Phagocytosis =
particles (solids)
Na/ K+ pumpsHelps maintain the Sodium and Potassium concentration gradients inside and outside of the cell
Step 1: 3 Na+ ions attach to high level binding siteStep 2: ATP is hydrolyzed, transferring a Phosphate to the pump
Na/ K+ pumps Step 3: The pump changes shape—moving Na+ ouside!Step 4: Na+ break off & 2 K+ bind to siteStep 5: Phosphate (P) is hydrolyzed, 3 changing the ATP to ADP
Na/ K+ pumps
Step 6: Pump changes shape and K+ attach to low level binding siteStep 7: K+ leave and cycle starts again!!!
https://www.youtube.com/watch?v=2-icEADP0J4
• As you watch the video, answer the questions onthe sheet your teacher gives you.
• Staple this page on page 75