BIOL107 Lecture Notes - Lecture 6: Eukaryote, Silicon Dioxide, Lignin

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL107
• Professor: michaelharrington

Document Summary

All eukaryotes have cell membrane as a protection. There are usually proteins attached onto the membrane. In multicellular eukaryotes, some of these proteins act to attach to other cells. Algae with distinctive, transparent cell walls made of silicon dioxide hydrated with a small amount of water. The cell wall is called a frustule and consists of two halves called valves. Since silica is impervious, diatoms have evolved elaborate patterns of perforations in their valves to allow nutrient and waste exchange with the environment: cerevisiae (single celled fungus): Its cell walls are made of chitin which is a fibrous substance consisting of polysaccharides and forming the major constituent in the exoskeleton of arthropods and the cell walls of fungi. Cell wall is composed mainly of strong fibers of the carbohydrate polymer cellulose. Cellulose is the major component of cotton fiber and wood and is used in paper production, it is a polysaccharide.