BIOLOGY 1A03 Lecture Notes - James Danielli, Lipid Bilayer, Isoprene

• School: McMaster University
• Department: Biology
• Course: BIOLOGY 1A03
• Professor: Joe Kim

Document Summary

Chapter 6- lipids, membranes, and the first cells. Cell membrane or plasma membrane: layer of molecules that surround the cell. Bagham used transmission electron microscopes to produce images of lipids called micrographs in. Four ring structure (polar) and isoprene chain (non-polar) Compunds that countain hydrophobic and hydrophilic regions are known as amphipathic. Phospholipid bilayers lipid bilayers: two sheets of phospholipid molecules allign micelles: when the hydrophobic tails face inwards and the heads are outwards. Permeability: the tendency to allow a given substance to pass across a a membrane. Selective permeability: some molecules can pass more easily across the membrane than other (small, non-polar molecules move across the bilayers quickly) The smaller the carbon chain and the more double bonds (unsaturated), means the more permeable the membrane is. Dissolved molecules and ions are known as solutes. Solutes tend to move from high concentration to a low concentration. Osmosis is the movement of water in diffusion.