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Biol, Chap 3
| Question | Answer |
|---|---|
| Who first used the term "cell?" | Robert Hooke |
| What 3 men are associated with the cell theory? In what century did they live? | Schleiden, Schwann, Virchow the 19th century |
| State the three parts of the cell theory. | 1. All living things are made of cells. 2. Cells are the basic units of structure and function in organisms. 3. All cells come from existing cells. |
| What is the structure and function of the cell membrane? | The cell membrane encloses the cell, keeps the cell interior from its surroundings, and regulates what enters and leaves the cell. |
| How many cells on average are in a human? | 100 trillion |
| Why are small cells more efficient than large cells? | Because they have a higher surface area to volume ratio. Substances do not need to travel as far to reach the center of the cell. |
| Which number should be bigger in the surface area to volume ratio? | The surface area. |
| What two characteristics are important when considering the quality of a microscope? | Magnification and resolution |
| What are the two major categories of microscopes? What is the magnification of each? | Light microscopes, 2,000 X magnification Electron microscopes, 200,000 X magnification |
| How do you calculate the total magnification of a light microscope? | Multiply the objective lens magnification by the ocular lens magnification. |
| Describe the correct procedure for focusing a slide on low power. On high power. | |
| What power are the three objectives on the microscopes used in class? | |
| In what three ways are the specimen and its image under the microscope different? | |
| Why should you never focus downward? | |
| What changes in light do you notice when switching from low power to high power? | |
| Label a diagram of the microscope. | |
| Know the function of every organelle we discussed. | |
| What cell structures/organelles are found only in plant cells? Animal cells? | Only plants have the cell wall, chloroplasts, and a central vacuole. Only animal cells have |
| What's the difference between a scanning and a transmission electron microscope? | Trans. elec. micro. shows internal details, the Scan. elec. micro. shows surface details and in 3-D. |
| Where in humans do we find cilia? | Trachea, oviduct |
| Label the diagram of an animal cell. | |
| Know macromolecule diagrams from the last test. | |
| Which organelles have an increased surface area that helps them to do their jobs? |
Created by:
kathyj
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