1. Tools of the Biologist Chapter 1 Section 1-4

2. Biology Tools Scientists use many tools in the laboratory and in the field. –Some are used for measuring –Some are used for observation Can anyone name me some tools that we used in the 2 previous labs?

3. Several common tools used in a Biology Laboratory

4. Microscope: One of the most important tools of the biologist is the microscope. A microscope is an instrument that makes things appear larger than they really are. There are several kinds of microscopes: –Simple Microscope –Compound Light Microscope –Electron Microscope

5. Simple Microscope This type of microscope only has one lens. Can anyone think of a simple microscope? Answer: Magnifying glass. Most simple microscopes only magnify objects 10X Simple microscopes are usually used to study objects like leaves of plants or the body of an insect.

6. Compound Light Microscope A compound light Microscope uses lenses to make an object appear larger.

7. Compound Light Microscope cont. Compound Light Microscope has 2 or more lenses. First lens is the ocular lens located in the eye piece. The second lenses are called the objective lenses. (5X, 20X, 50X, 100X)

8. Electron Microscope Some microscopes use electrons to form images of really small objects. They can magnify objects up to 300,000X. 2 kinds of Electron Microscopes: –Transmission Electron Microscope (TEM) –Scanning Electron Microscope (SEM)

9. Transmission Electron Microscope (TEM) This microscope passes electrons through the object being studied. TEM can magnify an object 1,000,000X. It can not be used on living tissue.

10. Transmission Electron Microscope (TEM) cont.

11. Scanning Electron Microscope (SEM) This type of microscope reflects electrons from the surface of the object being studied. Then it produces a three dimensional image of the object being studied.

12. Scanning Electron Microscope (SEM) cont.

13. Computers A computer is a machine that stores large amounts of information. Uses for computer in science: –Stores data –Make calculations –Run simulations –Take measurements –Keep track of research –Word processing –Make charts, graphs, tables