1-4 Tools and Procedures

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

K h d (m) dk c m

King Henry Doesn't [Usually] Drink Chocolate Milk

kilo- hecto- deka- [unit] deci- centi- milli-

12.54 km = 1 254 000 cm

Do Worksheet

•It is important to be able to convert metric units.

Recording and Analyzing Data

1. First record in a chart– Label the axes

2. Then put data on graphs

Often use computers

Determine structure of molecules

Use satellite images to determine global warming

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

Microscopes

• Electron microscope uses magnets to focus electrons.

• Magnifies 1,000,000 X’s• Must be in a vacuum

Laboratory Techniques

• Cell Cultures• Use a nutrient solution to grow a

group of cells

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

Centrifuged Blood

• Find the unsafe lab practices

Appendix B pp. 1066-1068

Lab Safety Quiz will be Sept. 5, 2008

Bring goggles and lock next Tuesday.