BIO E121 Lecture Notes - Lecture 5: Lipid Bilayer, Glycolipid, Phospholipid
Document Summary
Cell is the smallest functional unit of life. Cell makes up all living things (unicellular and multicellular organisms) Characteristics: structurally simple and smaller, lack membrane-bound organelles. Characteristics: structurally complex and larger, has membrane-bound organelles. Both cell types are measured in micrometers which equals 10^-6 meters. Cells can be seen with light, scanning, or electron microscopes. Life begins with one cell and results in differentiation of many specialized cells. All cells have unique morphologies and functions. Plasma membrane - cell membrane, phospholipid bilayer, or plasma lemma. Function: separates internal & external contents, boundary to environment, physical barrier, shape & support. Composed of: phospholipid molecules, phospholipid bilayer, integral proteins, peripheral proteins, glycoproteins (provides recognition between cells), and glycolipids. Function of the structure: selectively permeable as it regulates movements of substances in and out of the cell. Cell adhesion molecules (cams): stick cells together to form tissues/organs.