BIO SCI 93 Lecture Notes - Lecture 1: Heredity, Pattern Formation, Zygote
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BIO SCI 93 Full Course Notes
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Cohesion- interactions between water molecules,, formation of hydrogen bonds. Solvent-interaction between water and other molecules, formation of hydrogen bonds. Composed of h and o, water is a compound. Two h atoms are covalently bonded to one o atom. Polar, electrons are not shared equally, o has partial negative charge while h has partial. Atom is the foundation (o,h,c) and combine to form molecules such as lipids and proteins, and then cells are formed by combinations of molecules. Cells are lowest structural level capable of performing all activities of life. Na+ bonds with water o and cl- bonds with water h. water is solvent and na+ and cl- are solutes. Each dissolved ion is surrounded by sphere of water molecules called hydration shell. Elements-cannot be broken down into other substance, 92 elements and 25 essential for life, 96% of living matter is made up from 4 elements (chon) and (s,k, ca,p) 4% and some trace elements of (fe,i,zn,cu)