HLSC 1200U Lecture Notes - Lecture 2: Fluid Mosaic Model, Golgi Apparatus, Lipid Bilayer
Document Summary
Functional anatomy of a cell: amino acid, atp, dna, rna, protein, saturated fatty acids, unsaturated fatty acids, phospholipids, triglycerides. Location: plasma membrane: outer boundary of cell separating cell from external environment (ecf, membranous organelles: sacs and canals separating organelles from cytosol, nuclear envelope: outer boundary of nucleus separating nucleus from cytoplasm. Fluid mosaic model: molecules of the cell membrane are arranged to form a continuous sheet, mosaic of molecules is fluid: Basic structure: double layer of phospholipid molecules (lipid bilayer): hydrophilic heads & hydrophobic tails, held together by chemical attraction, purpose of double layer, groupings of membrane molecules form rafts that float as a unit in the membrane. Rafts ( c ) may pinch inward to bring material into the cell or organelle. Other molecules: cholesterol molecules (a): scattered among lipophilic portion and allow membrane to function properly at body temperature, integral membrane proteins (___b_): attached to hydrophilic portion to perform specific functions.
