Don’t Be Cheeky!

1. Don’t Be Cheeky! • Using a tooth pick, gentlyscrape the inside of your cheek. • Place the cells on to the slide . • Place one drop of iodine onto your specimen. • Place a cover slip over your specimen. • View your specimen under both low power (small objective) and high power (larger objective) and diagram what you see.

2. Step #1: Behave In Lab

3. Step 2: Your Cells are Quite Small • We will be using microscopes to view these mini structures.

4. The Onion Cell

5. The Onion Cell • Get a thin slice using your finger tips. • Place the thin onion slice onto the slide. • Place one drop of iodine onto your specimen. • Place a cover slip over your specimen. • View your specimen under both low power and high power and diagram what you see.

6. Adding a drop of Iodine

7. Plasmolysis • Prepare a slide with one fresh water seaweed (Elodea) leaf. • Diagram what you see. • Identify the chloroplasts (site of photosynthesis) and the cell wall. • Do not use the iodine indicator for this lab. • Add saltwater (Hypertonic solution) and describe what you see.

8. Plasmolysis with an onion cell

9. Plasmolysis

10. Go Banana’s: Go Green! • Banana cells are also useful. Smear a little (less than the size of a sesame seed) on a glass slide. • Rub the cells apart, then put in a drop of Iodine solution. • Cover the glass slide with a cover-slip. • These cells contain starch grains.

12. Three Banana Cells

15. Coming Soon: Cell Division Lab

16. Complete the entire lab packet. • Each person is responsible for turning in a completed lab packet. • You may work in groups of four. • When you are finished with your lab, please clean your slides for the next group and make sure you turn off the power source to your microscope.