IL6 - The Onion Cell Lab
Background:Onion tissue provides excellent cells to study under the microscope. The main cell structures are easy to see when viewed with the microscope at medium power. For example, you will observe a large circular nucleus in each cell, which contains the genetic material for the cell. In each nucleus, are round bodies called nucleoli. The nucleolus is an organelle, which synthesizes small bodies called ribosomes. Ribosomes are so small, you cannot see them with the light microscope. Also present in the onion cell, is a well developed cell wall and a cell membrane just beneath it.
Purpose: To study the structure of the onion epidermal cell, with particular emphasis on the nucleus and nucleoli.
Materials: The following materials are required; onion, microscope, glass slide, coverslip, iodine stain (Note: iodine is toxic and will stain - handle with care).
Onion cells at 100´
Onion cell at 400´ or 100´