20. You observe an unknown cell under the microscope, and you notice it is rectangular and contains numerous small green organelles. This cell is most likely a(n): A. archaean B. bacterium C. plant cell D. animal cell E. fungus 21. Your liver cells are different in structure and function from your skin cells because: A. skin cells are prokaryotic B. liver cells have mutated due to alcohol exposure C. they have different DNA D. skin cells lack mitochondria E. they produce different proteins 22. When using an objective on a microscope labeled 4x and looking through 10x eyepieces, your tota magnification is A. 0.4x B. 4x C. 10x D. 40x E. 400x 23. You measure the field of view of a microscope at 40x total magnification and find that the diamet 4,000 um across. If you change the objective to one that gives you 100x total magnification, the diameter of your field of view would be Α. 4 μm B. 400 um C. 1,600 um D. 1,600 mm E. 4,000 um 24. Which of the following metric property/unit pairs is incorrect? A. Volume - liter B. Distance - meter C. Molecular weight - gram/mole D. Mass -ounce E. Temperature - degrees Celsius 25. How many nanograms (ng) are in a milligram (mg)? A. Ten (10 or 101) B. One Hundred (100 or 102) C. One Thousand (1,000 or 103) D. One Million (1,000,000 or 10) E. One Billion (1,000,000,000 or 109)​