BIO1011 Lecture Notes - Lecture 6: Lipid Bilayer, Phospholipid, Nucleolus
6 Aug 2018
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Bio1011 lecture 6 - energy transformation in cells and. Inside cells (eukaryotes: nucleus (dna is membrane bound) Membrane bound organelle: plants also have a cell wall and chloroplasts. Inside cells (prokaryotes: nucleoid (dna floating loosely in this area, cytoplasm, capsule. Water molecules are polar: carry both a negative and positive charge. Tail = hydrophobic fatty acid (uncharged: non polar. A "shell" of water molecules sits around the charged phosphate head. A phospholipid bilayer forms the semi-fluid framework of all membrane. Water cannot form ionic bonds with the non-polar lipid tails (oil and water don"t mix) Proteins are an essential component of all biological membranes. Proteins maintain membrane structure by supporting the membrane. Proteins allow for transport of ions, and thus define membrane function. Phospholipids: fluid phospholipid bilayer, diverse phospholipids comprise the bilayer. Phospholipid composition of each half of the bilayer may be very different. Very little exchange of phospholipids between halves of the bilayer.
