Question

Explain the structure of a cell as seen under the microscope

Answer 1

typical animal cell is 10–20 μm in diameter, which is about one-fifth the size of the smallest particle visible to the naked eye. It was not until good light microscopes became available in the early part of the nineteenth century that all plant and animal tissues were discovered to be aggregates of individual cells. This discovery, proposed as the cell doctrine by Schleiden and Schwann in 1838, marks the formal birth of cell biology.

Animal cells are not only tiny, they are also colorless and translucent. Consequently, the discovery of their main internal features depended on the development, in the latter part of the nineteenth century, of a variety of stains that provided sufficient contrast to make those features visible. Similarly, the introduction of the far more powerful electron microscope in the early 1940s required the development of new techniques for preserving and staining cells before the full complexities of their internal fine structure could begin to emerge. To this day, microscopy depends as much on techniques for preparing the specimen as on the performance of the microscope itself. In the discussions that follow, we therefore consider both instruments and specimen preparation, beginning with the light microscope.




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Answer 2

Answer:

You’re made from millions of tiny cells, but you can’t take out a couple of cells in your hand or leg easily without any pain. Even though it looks we can’t take any cell out without feeling a pain, actually we can take out the cells in your mouth easily.

Your internal surface of the mouth is surrounded by Epithelial Cells which you can take out by your finger nails or using a small spoon. Of course, these epithelial cells in your mouth can be observed under a microscope in its high power. Epithelial cells have a shape of spherical with a spherical structure of granulated area within the cell.

The large spherical area is the Nucleus while the granulated part is the Cytoplasm of the cell. These are all common parts of a cell. In the above observation of onion cells, you can see the Cell Surface Membrane which is consisted in any living cell.