KAAP309 Chapter 3: 3. Cells
21 Mar 2017
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Document Summary
Cell basic structural/functional unit of living organisms: cellular properties = properties of life. Principle of complementarity of structure and function: biochemical activities of cells are determined by : shapes/forms, # of specific subcellular structures. Cells are basis of continuity of life. Plasma membrane outer boundary of cell. Cytoplasm intracellular fluid: contains organelles small structures that perform specific functions. Separates intracellular fluid (icf) from extracellular fluid (ecf). Bilayer of phospholipids: proteins dispersed throughout constantly changing mosaic pattern. Major component: phospholipids: solubility properties align themselves when placed in water, hydrophilic attracted to water & charged head. Main component of icf/ecf: water phospholipid heads face. Icf/ecf: hydrophobic not attracted to water & uncharged tail composed of 2 fatty acid chains. Tails face each other in middle: membrane: fluid phospholipids can move freely around membrane except switching between layers, mostly unsaturated: increased space between layers increased. Minor components: glycolipids lipids + sugar groups.
