BIO152H5 Lecture Notes - Lecture 2: Sickle-Cell Disease, Evaporation, Polysaccharide
Document Summary
15/09/16: water molecule that supports all life: Life began on water and evolved for 3 billion years. Water"s (cid:271)ehaviour depends on its stru(cid:272)ture: water properties: Cohesion: water molecules stick together due to hydrogen bonds and are attracted to each other. Transportation property because this way the water will travel upstream a tree. Surface tension: a measure of how difficult it is to break the water surface. High specific heat: water has a high specific heat due to hydrogen bonds. Evaporation: occurs because the hottest molecules with the highest kinetic energy leaves as a gas. Solid: ice is lighter that liquid water because the density is low in ice less condensation of water molecules. And this allows life to still occur on water. Chemical solvent: many reactions occur on water, so it acts like a solvent: evolutionary connection: All living organisms use nucleic acids, lipids, carbohydrates, amino acids, fatty acids.
