1. March 12, 20161 UNIT 1: CELLULAR BIOLOGY Cell Theory & the Microscope

2. Cell Theory 1.All living things are composed of one or more cells. 2.Cells are the basic structural and functional units of life. 3.All cells arise from the division of other cells Note: Robert Hooke discovered cells in 1655 How? …………

3. Compound Light Microscope

4. has two lenses 1. ocular lens (10X) 2. objective lens (4X, 10X, 40X) - Low 4X - Medium 10X - High 40X magnification: the ability of lenses to enlarge the image of a specimen magnification = ocular lens X objective lens 400X = 10X times 40X

5. resolution: the amount of detail seen when viewing a specimen poor resolution = blurred image good resolution = clear, sharp image Compound Light Microscope

6. March 12, 20166 Compound Light Microscope 1. ocular 2. body tube 3. arm 4. stage clip adjustment knob 5. coarse adjustment knob 6. fine adjustment knob 7. revolving nosepiece 8. objective 9. aperture 10. stage clip 11. stage 12. condenser 13. diaphragm 14. light 15. base

7. Compound Light Microscope Microscope PartFunction 1. oculareyepiece lens, magnifies 10X 2. body tubedirects light into ocular, supports 3. armsupport 4. stage clip adjustment knob moves slide around 5. coarse adjustment knob moves stage up and down to focus image

8. Compound Light Microscope Microscope PartFunction 6. fine adjustment knob fine focus for most clear image 7. revolving nosepiece holds objective lenses & facilitates changing magnification 8. objective lensfurther magnifies the image 9. apertureopening to allow light to hit the specimen 10. stage clipholds slide in place

9. Compound Light Microscope Microscope PartFunction 11. stageplace specimen on it 12. condenserfocuses light into a beam 13. diaphragmcontrols the amount of light hitting the specimen 14. lightsends out light rays so specimen is visible 15. basesupports microscope

10. Microscope Activity 1. Obtain a microscope. Working in pairs, identify all of the parts of the microscope. 2.Do activity (Resolution) on page 7. Make sure each of you answers questions a, b and c Materials: compound light microscope slide & cover slip coloured picture from a magazine