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11 WEEK 5 OBJECTIVES Chapter 4 (pp. 57 - 60, 63 - 80) 1. Explain why microscopes are needed to see most cells. Because cells are too to be seen without magnification. 2. Name 2 types of microscopes used to view cells and their parts, and list 2 differences between them. LIGHT MICROSCOPE ELECTRON MICROSCOPE Can be used to view living or dead cells. Can't be used to view living cells, because it operates in a vacuum. 3. Explain why cells are always small, using the phrase "surface area to volume ratio." Cells need to have a large surface area to volume ratio so that there will be sufficient to meet the needs of their Small cells have SA to V ratios. 4. Distinguish between prokaryotic and eukaryotic cells, and give an example of each. Prokaryotic = a cell that does not have a or other membrane-covered Example: Eukaryotic = a cell that does have a and other membrane-covered Example: any animal cell, plant cell, protist cell, or fungi cell