ࡱ> PRO[ bjbj q2ΐΐ$\W40fff1333333$WfffffWlnnnf 1nf1nnVFw d|Zp  00 z  $ffnfffffWWnfffffff fffffffff : Name Class Date Section 1-4 Tools and Procedures (pages 24-28)  Key Concepts What measurement system do most scientists use? How are light microscopes and electron microscopes similar? How are they different? A Common Measurement System (page 24) Why do scientists need a common system of measurement?  When collecting data and doing experiments, what system of measurement do most scientists use? What is the metric system?  4. Complete each equation by writing the correct number or metric unit. a. 1000 meters = 1 b. 1 liter =milliliters c. 1 gram =milligrams d. 1000 kilograms = 1 Analyzing Biological Data (page 25) 5. When scientists collect data, what are they often trying to find out?  6. What does a graph of data make easier to recognize and understand than a table of data? Microscopes (pages 25-26) 7. What are microscopes?  8. What are compound light microscopes?  9. How do chemical stains make light microscopes more useful?  Pearson Education, Inc., publishing as Pearson Prentice Hall. 22 Name Class Date 10. What are the two main types of electron microscopes?   12. How must samples be prepared for observation by an electron microscope? 11. Compare how a TEM and an SEM produce images.  Laboratory Techniques (page 27) 13. A group of cells grown in a nutrient solution from a single original cell is called a(an)  14. What technique do biologists use to separate one part of a cell from the rest of the cell?  Working Safely in Biology (page 28) Pearson Education, Inc., publishing as Pearson Prentice Hall. 23 15. 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