1. Do Now
1. is osmosis active or passive transport? Does it require energy?
2. If solute concentration is greater inside than outside the cell water flows in, the solution is?
3. If solute concentration is greater on the outside than the inside then cell water flows out, the solution is?
4. When the solute/solvent concentration is equalized the solution is?
Today’s Topic: The Cell Membrane

2. Binder
Handout
(Seat)
HW: 3.5
Today’s EQ: How does the concentration of molecules on either side of a membrane affect movement?
Today’s objective: we will be able to explain selectively permeable in order to understand the importance of molecule transport in cells
Set your desk up and silently complete the DO NOW, have your homework out to be checked

3. Agenda
Do Now & Review DATA Days Updates Semipermeable Practice

4. DATA Days
Remember to check your grades on the back walls on the way in.
The class challenge board as been updates

5. Some more Data A1: 95%89% A2: 90%93% A3: 86%83% A4: 89%84%
B1: 93%91%
B3: 93%92%
Day’s left in the quarter: 14

6. Updates
Your first complete Unit test will be Monday September 14th Tuesday September 15th
Class Competition Wall has been updated

7. The Cell Membrane

8. Cell Membrane Phospholipid Bilayer (two layers of LIPIDS)
Controls the movement of molecules in and out of the cell
Selectively Permeable

9. Phospholipid Bilayer Two layers of phospholipids in cell membrane
A phospholipid
-- is a lipid with 2 fatty acid tails
-- has a phosphate connected to glycerol head.
Two layers of phospholipids in cell membrane

12. Selective Permeability
Selective permeability: a membrane that will allow specific types of molecules to pass through it.
Also known as semipermeable.
Like a security gate or screen
Let me in!!

13. Selectively permeable
Molecules may be able to enter depending on size or charge
Water molecules +
Cell membrane molecules
Waste molecules -

14. Passage of Molecules Across Cell Membrane
Can pass freely through membrane if
--Small molecules (water)
--Uncharged molecules
Cannot pass freely
--Large molecules
--Charged molecules (positive or negative)

15. Transport Proteins
Transport

16. Transport Proteins Transport Protein Hydrophilic head Hydrophobic tail
Help specific molecules move through the cell membrane
Stretch across both sides of the cell membrane
Act like doorways or tunnels for molecules to pass through.
Transport Protein
Hydrophilic head
Hydrophobic tail

17. Brain Break
Some proteins are found in the plasma membranes of cells. What part of the protein is within the membrane itself?
A. hydrophilic region
B. Hydroponic region
C. Hydrophobic region
D. Hydrocoel region

18. Brain Break What type of macromolecule makes up cell membranes?
A. carbohydrates
B. lipids
C. glucose
D. enzymes