Aim: How has the electron microscope enabled scientists to see the unseen?

1. Aim: How has the electron microscope enabled scientists to see the unseen?

2. Living Environment HW#10Due Friday 10/8 • Read text pages 184-189 • Pg 186 word origins – answer question • Pg 186 draw diagram –answer predicting question under fig. 7-18 • Read – How does penicillin work? Summarize and come up with two questions for further research.

3. Differences between compound, and electron microscopes

4. Difference in images

5. The cell membrane helps the cell maintain Homeostasis Lipid bilayer

6. Structure of the cell membrane Outside of cell Carbohydrate proteins Cell membrane Inside of cell (cytoplasm) Protein channel Lipid bilayer

7. antibiotics that interfere with cell wall synthesis have a high specificity and are low in toxicity to host organisms

8. Tagged carbohydrate on the surface of the cell membrane

9. Aim: How do substances diffuse through a membrane? Things that move into a cell… Things that move out of a cell…

10. Diffusion – molecules of a substance move from areas of higher concentration to areas of lower concentration Water molecules Sugar molecules

11. Facilitated diffusion Outside of cell Carbohydrate proteins Cell membrane Inside of cell (cytoplasm) Protein channel Lipid bilayer

12. Active Transport requires energy A molecule is moving across the cell membrane from an area of low concentration with the help of a transport protein A B

14. Large molecules pass through the cell membrane by endocytosis and exocytosis

16. Do Now Summary Plasma Membranes are Selectively Permeable • What does this mean? • What are the ways in which substances can pass through a cell membrane