Biology 1002B Chapter Notes - Chapter 5.1 - 5.4: Facilitated Diffusion, Passive Transport, Peripheral Membrane Protein
Document Summary
5. 1 an overview of the structure of membranes. Membranes act as selectively permeable barriers that allow for the uptake of key nutrients and the elimination of waste products while maintaining a protected environment for cellular processes to occur. The current view of membrane structure is based on the fluid mosaic model. The proteins of membranes are larger than that of the lipid molecules, and therefore move more slowly in the fluid environment. note: a small number of proteins anchor cytoskeleton filaments to the membrane and therefore do not move. The proportions of lipids and proteins within a membrane vary depending on the type of membrane. 5. 2 the lipid fabric of a membrane. Lipid refers to a diverse group of water-insoluble molecules that includes fats, steroids, and phospholipids the dominant lipid in membranes. Phospholipids are composed of a head and two long hydrocarbon chains (fatty acids).
