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7.1 Vocabulay
The cells we know today
| Term | Definition |
|---|---|
| Cells | The basic unit of living organism |
| Anton Von Leeuwenhoek | First person to look at cells through a microscope. Looked at living cells. |
| Robert Hooke | Second person to look at cells through a microscope. Looked at corks with holes, which is the reason why he named the cells. |
| Cell Theory | Developed by the ideas of many scientist (Schleiden & Schwann.) Three main ideas: 1. All life is made up of one or more cells. 2. Cells are the basic unit if structures in life. 3. All cells come from pre-existing cells. |
| Prokaryotes | Cells without membrane-bound organelles. |
| Eukaryotes | Cells with membrane-bound organelles. |
| Eyepiece | Where you look through the image of your specimen. |
| Objectives | The microscopes two 2, 3, or more objectives attached to the nosepiece; vary in length. |
| Nosepiece | The rotating part of the microscope at the bottom of the body tube; holds the objectives. |
| Coarse Adjustment | Large round knob used for focusing the specimen; may move the stage to the upper part of the microscope. |
| Fine Adjustment | Small, round knob used to fine-tune the focus of your specimen after using the coarse adjustment knob. |
| Diaphragm | Controls the amount of light going through the aperture. |
| Stage | Large, flat area under the objectives; has a hole in it that allows, light through; the specimen/slide is placed on the stage for viewing. |
| Compound Like Microscope | A series of lenses used to magnify object in steps. |
| Electronic Microscope | A beam of electrons used to magnify structures up to 500,000 times their actual size, allowing scientist to see structures within the cells. |
| Organelle | Small specialized structures in all cells. |