Biology 1002B Chapter Notes - Chapter 4: Fluid Mosaic Model, Membrane Protein, Cytoskeleton
11 Feb 2019
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Chapter 4: external phosphate heads, hydrophilic -> like water, have proteins and carbohydrates, passive transport -> no energy needed, higher concentration -> lower concentration. 4. 1 an overview of the structure of membranes: plasma membrane, selectively permeable barrier, uptake of nutrients and elimination of waste products, protected environment for cellular processes to occur. 4. 1a membrane consists of proteins in a fluid of lipid molecules: fluid mosaic model, proposes that membrane are not rigid, have proteins moving around a mixture of lipid molecules. Lipid molecules in membrane are highly dynamic: some lipid and protein are linked to a carbohydrate group forming, glycolipids, glycoproteins, proteins. Involved in transport and attachment: signal transduction, electron transport. Larger than lipids -> move slowly: some anchor to cytoskeleton filament, do not move, membrane is asymmetrical, different side perform different functions. 4. 2 the lipid fabric of a membrane: fats: neutral lipids, semisolid at biological temperatures, phospholipids: phosphate-containing lipid, steroids.
