1-4 Tools and Procedures

1. 1-4 Tools and Procedures

2. Metric System Appendix C p. 1069 • SI = Le Systeme International d’Unites • Based on units of ______ • 10 • What is the basic unit of: • Mass length liquid volume • Grams meter liter

5. Do Worksheet • It is important to be able to convert metric units.

6. Recording and Analyzing Data 1. First record in a chart • Label the axes 2. Then put data on graphs

7. Often use computers Determine structure of molecules Use satellite images to determine global warming

8. Microscopes • Light Microscopes use lenses to bend light to focus and enlarge the image Can enlarge up to 1000 X’s Can view living things Object must be thin enough for light to get through it

9. Microscopes • Electron microscope uses magnets to focus electrons. • Magnifies 1,000,000 X’s • Must be in a vacuum

10. Laboratory Techniques • Cell Cultures • Use a nutrient solution to grow a group of cells

11. Cell Fractionation • 1. Break cells with a blender. • 2. Broken cell bits added to liquid in a test tube. • 3. Test tube put into a centrifuge. • 4. Spin to separate dense parts near bottom of tube. • Separating DNA

12. Centrifuged Blood

13. Find the unsafe lab practices

14. Appendix B pp. 1066-1068 Bring goggles and lock next Tuesday. Lab Safety Quiz will be Sept. 5, 2008