1.  Objective Here!

2.  Where do you find roads without vehicles, forests without trees, and cities without houses?

3. Which numbered organelle produces ATP and is called the Powerhouse of the cell? A) 1 B) 7 C) 9 D) 13

5. Maintaining control of the internal environment

6.  The structure of the plasma membrane  How the plasma membrane functions as a semi-permeable membrane

7.  The membrane separates the organelles of the cell from the outside environment  It is made of a double layer of phospholipids and embedded proteins.

8.  Controls what enters and leaves the cell.  Nutrients  Waste  It is said to be selective permeability (Everything CANNOT enter the cell)  Water can freely enter and leave the cell  Maintains homeostasis What does the plasma membrane do?

10.  There are 3 types of lipids (fats)  Phospholipids  Glycolipids  Cholesterol  Proteins  Integral (glycoprotein)  Peripheral

11.  Made of lipids (fats) with a phosphate head  Lipid portion is 2 fatty acid tails. The tail is hydrophobic: does NOT like water  Phosphate head is hydrophilic: it DOES like water. phospholipid

12.  Cholesterol embedded in membrane keeps it fluid  The bi-layer is known as the Fluid Mosaic Model, because proteins embedded in the membrane can move Fluid Mosaic Model

13.  Here is what a phospholipid bi-layer looks like as a sphere Fluid Mosaic Model

14. Materials must move in and out of the cell through the plasma membrane. Some materials move between the phospholipids. Some materials move through the proteins.

15.  Some proteins span membrane and determine which molecules can enter or leave. These are transport proteins.  Other proteins on the surface act as receptors

16. 1) Channel Proteins 2) Carrier Proteins 3) Enzymatic Proteins 4) Receptor Proteins 5) Cell Recognition Proteins

17. Have channels that allow molecules to move from an area of high concentration to an area of low concentration. NO energy is used

18. Carrier Proteins – combine with a molecule to help it move across the membrane

19. – Carry out metabolic reactions

20. Receptor Proteins– Have a binding site for a specific molecule.

21.  Marker Proteins–extend across the cell membrane and serve to identify the cell. The immune system uses these proteins to tell friendly cells from foreign invaders. They are as unique as fingerprints.  They play an important role in organ transplants. If the marker proteins on a transplanted organ are different from those of the original organ the body will reject it as a foreign invader.

22. Selectively Permeable

23.  What is the function of the cell/plasma membrane?  What is the membrane made of?  The membrane is said to be ________________  What is the name of the model?  How can molecules enter the cell?

24.  http://www.wisc-online.com/objects/ViewObject.aspx?ID=ap1101 http://www.wisc-online.com/objects/ViewObject.aspx?ID=ap1101

25.  Cell membranes are constructed mainly of:  A. lipid bi-layers  B. Protein pumps  C. carbohydrate gates  D. chloroplast