Using the Microscope to Observe Cells

1. 01/14/14 Small group – Competition REWARD, and write in your notebook. Using the Microscope to Observe Cells Review – Quiz material: 1) Living things are made up of cells. Cells are organized at different levels to form very complex living organisms like your body. Each level has a specific role or job to perform. List these levels in the correct order of organization from the simplest to the most complex?

2. 2) All living things, plant or animal, have one thing in common. _____? 3) All of the following are characteristics of both living organisms and cells EXCEPT — A- remove waste from themselves B- rely on chemicals for communication C- grow and die D- extract energy from food

3. 4) Ashley saw a cell under a microscope and drew what she saw. This cell is classified as — A- prokaryotic B- eukaryotic C- periodic D- nucleotic

4. To Begin…Over the next few days, our class will be completing a descriptive investigation to learn more about the idea that all living organisms are composed of cells.You will be using the microscope to observe a variety of organisms. Asyou observe each, you will make detailed drawings.

5. Science Journal Entries Model Tape the handout “Scientific Processes: for Experimental Investigations” in your notebook. Copy this Format… 1/15/2014 All Living Organisms are Composed of Cells 1)Problem: What did each organism have in common with the others? Were all of the cells observed the same shape? Why do cells have different shapes? 2) Hypothesis: If cells are different, then I will see that evidence in my drawings using labels. I will also observe what is the same and make notes.

6. Continued… 3) Procedure: Following proper use procedures for a microscope and glass and electrical safety rules. Record additional statements and make detailed drawings in my science notebook. Each drawing will be labeled with the magnification used and the identification of the specimen. (color, shapes) 4) Materials: microscope, prepared slides from a variety of organisms 5) Data: Slide #1- Human Epithelial (blue stain), focus x100, Fine x100 You See: course x10 You draw and label:

7. Continued… Continue to record and draw each slide with labels. Slide #2- 6) Results: My data/facts show… 7) Conclusions: To answer the questions: What each organism slide has in common is… Are the cells the same shape… Why they are different shapes… 8) Applications: I conclude with my data and facts that…

8. You will also be assessed on proper use of the microscope. Small Group Activity- Review Textbook p. 853 “Reference Handbook C”; Care and Use of a Microscope. And Handout to place in your notebook. View: http://micro.magnet.fsu.edu/primer/java/scienceopticsu/virtual/magnifying/ By the end of this lesson, you will be asked to properly focus a microscope on a specimen.

9. Review proper use of a microscope • Instruct students to turn the coarse adjustment knob to raise the body tube. Revolve the nosepiece until the low-power objective lens clicks into place. Adjust the diaphragm. While looking through the eyepiece, adjust the mirror until the bright white circle of light comes on. • Instruct students to place their first slide on the stage. Center the slide over the opening of the stage. Use the stage clips to hold the slide in place. • Instruct students to carefully turn the coarse adjustment knob to lower the body tube until the low power objective almost touches the slide. • Instruct students to look through the eyepiece, turning the coarse adjustment knob very slowly until the specimen comes into focus. • Inform students to switch to the high power objective lens students must look at the microscope from the side. Students should carefully revolve the nosepiece until the high-power objective lens click into place. • Explain to students to not allow the lens to touch the slide. Small group Investigative activity: 2-3 students per group, view slides and take notebook data. Remind students they are responsible for damages.

10. Remember…