BIOL 2021 Lecture Notes - Lecture 3: Lipid Bilayer, Glycolipid, Golgi Apparatus

• School: York University
• Department: Biology
• Course: BIOL 2021
• Professor: Patricia Lakin- Thomas

Document Summary

Glycolipids: sugar attached to lipids: have a sphingosine backbone & a fatty acid chain in animal cells, addition of a sugar or many sugars takes place in the. Lipids in biological systems usually have a cylindrical cell. They will spontaneously form a bilayer to minimize free energy. In water, phospholipids can either form a micelle or a lipid bilayer. Phospholipids will dissolve in water because it can create bonds with water. If lipids attracted each other and formed bonds, membranes might be less fluid or may even form a rigid structure. Lateral diffusion: can switch positions within the same layer. Flexion of tails: tails can move together or apart. Flip-flop: moving from one side of the membrane to the other: doesn"t occur very often because it required energy, exception: cholesterol can does this often. Lipid composition refers to unsaturated vs. saturated fatty acids. At high temperatures, saturated chains are created to become less fluid.