bio7

Biology, 6th Edition

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Greg Steinberg Mrs. Wierzbowski AP Biology Chapter 7 A Tour of the Cell A. How we Study Cells a. Microscopes i. Microscopes enlarge very small objects such as a cell ii. Light Microscopes use visible light to pass through the object into the lens. iii. Attributes of a good microscope are high resolution and high magnifying power. iv. When you enlarge the appearance of an object, the quality of the larger image is less than the original. This is resolution. v. Most cellular organelles are too small to be seen with a microscope. b. Electron Microscopes i. Sends an electron beam through the object and is the bend of the electrons is detected. The results are published on a computer or television screen. c. Fractionation i. A solution of cells is spun at very high speeds. The result is undamaged organelles separated from the rest of the cell. B. A Panoramic View of the Cell a. Difference i. All cells have a plasma membrane. Inside of the membrane, there is a substance called cytosol in which the organelles float in. ii. All cells contain DNA – genetic carrying information. iii. The DNA of a eukaryotic cell is found inside of another membrane-enclosed organelle called the nucleus. iv. The DNA of a prokaryotic cell is found in a localized area of the cell.
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