CAS NE 102 Lecture Notes - Lecture 9: Sterol, Amphiphile, Garland Science
20 Jul 2016
School
Department
Course
Professor
Document Summary
Plasma membrane: a protein-studded, fatty film; membrane that defines a cell. Separates a cell from its surroundings, enabling the molecular composition of a cell to differ from its environment. A) bacterial cells usually only have plasma membrane. B) eukaryotic cells also have internal membranes that enclose organelles. Dots show molecules, cell membranes prevent molecules on one side from freely missing with those on the other side. In hd, transcription for the gene encoding bdnf is impaired. Roles of intracellular membranes: organelles in eukaryotic cell have intracellular membranes. Phospholipids organized in the bilayer of the membrane. Bace and app are imbedded in membranes. Phosphatidylcholine: most common phospholipid in cell membranes (pic above) Hydrophilic head choline linked to a phosphate group. Phosphate and choline are charged gives the polarity to the hydrophilic head. Enables the phospholipid to make interactions with water in the cell or extracellular environment. Longer chain of phospholipids more contacts can be made between hydrocarbon tails.
