- The cell membrane is a semi-permeable membrane that allows substances in and out of the cell. The two main materials that a cell membrane is made out of are lipids and proteins. For more information, click on the link http://biology.about.com/od/biologydictionary/g/cell-membrane.htm.
- The cytoplasm is a clear, jelly-like substance that supports and protects the other organelles in the cell. It also contains cytoskeleton fibers. To find out more, check out http://www.innovateus.net/innopedia/what-are-functions-cytoplasm.
- The endoplasmic reticulum is a network of tubes, or membranes, which carries material through the cell. It also helps in making ribosomes within the cell. Click here for more info http://micro.magnet.fsu.edu/cells/endoplasmicreticulum/endoplasmicreticulum.html.