| A | B |
|---|
| microscopes were introduced | in the 17th century |
| light microscope | light is passed thru specimen, glasss lens, which bends light so that it is magnified |
| electron microscope was developed | in the 1950's |
| electron microscope | sends a beam of electrons thru a specimen |
| light microscope can magnify up to | 2,000 times |
| elctron microscope can magnify up to | 2 million times |
| compound microscopes magnify | 400 times |
| theresolution of a microscope depends upon | the quality of the lens |
| when using a compound microscope specimens are often | stained to make particular structures stand out |
| common stains include | Lugol's solution, Methylene ble, Wright's stain |
| data | data are numbers, words, images, etc., accepted as they stand |
| variables | measurable factors or qualities that change during an experiment |
| independant variable | one that is changed by the experimentor |
| dependant varaiable | variable that changes in response to the independant variable |
| constants | factors that do not change |
| controlled experiment | seeking data on only one independant variable |
| collected data is often recorded by a | graph |
| on a graph the independant variable is plotted on the | x axis |
| on a graph the dependant variable is plotted on the | y axis |
