1. Tools of Science

3. Microscopes Magnify, or make the image appear larger than it really is Most important tool of the biologist

4. Three types of microscopes Stereoscope/dissecting scope –Max. mag about 100X –3D image Light microscope –Uses light to magnify and illuminate –2D image –Limited to increasing the image by about 2000 times (x) Electron microscopes –Uses beams of electrons to magnify –Can increase apparent image by up to 100,000,000 x –2D & 3D images Scanning Tunneling Electron Most advanced Allows for molecular structure to be seen (3D) Transmission Electron (TEM) passes electrons through thinly sliced specimen (2D) Scanning Electron (SEM) Bounces electrons off metalic coated surface 3D

6. Images and magnification

7. The compound microscope