SLE111 Lecture Notes - Lecture 1: Lipid Bilayer, Hydrogen Bond, Chemical Polarity

• School: Deakin University
• Department: Science, Engineering and Built Environment
• Course: SLE111
• Professor: Peter Beech

Document Summary

Highly ordered: chemical, cellular, tissue, organ, organ system, and organelle. Most (96. 3%) of living matter consists of carbon, oxygen, nitrogen and hydrogen. The larger amount of the 3. 7% remaining is sulphur, phosphorus and calcium. Carbon is a versatile building block for molecules. H20 is a polar molecule (one side has a slight negative charge- o and one side has a slight positive charge- h) and essential for life. Hydrogen bonding: polarity of water results in hydrogen bonding (the attraction between h and an electronegative atom- usually o or n). Because of h-bonding water is more structured than other liquids (surface tension, ice, thermal buffering). A hydrogen atom in a hydrogen bond between two water molecules can shift from one to the other. ph ph represents the concentration of hydrogen ions (h+) in a solution. Acids increase [h+] in a solution while bases decrease it. Acid: donates a proton. ph less than 7. Base: accepts a proton. ph more than 7.