SLE212 Lecture Notes - Lecture 1: Natural Selection 2, Metabolic Pathway, Sodium Chloride
17 May 2017
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Document Summary
Biochemistry: the application of chemistry to the study of living things at the cellular and molecular level. Characteristics of living organisms: must undergo metabolism, maintain homeostasis, possess capacity to grow, respond to stimuli, reproduce, adapt to environment by natural selection. Essential elements for life: organic matter is 25/92 chemical elements. 96% c, o, n and h. 4% p, s, ca, k and na. Ionic bonds: 2 atoms join to fill outer shells. Nacl, kcl, cacl2: covalent bonds: sharing of a pair of valence electrons, hydrogen bonds: h atom bonded to an electronegative atom. 3 atoms in a line with h at the centre. Van der waals interactions: occurs between non polar molecules. Biomolecules: have a c skeleton plus other groups of atoms to form functional groups. Rotated molecule cannot be superimposed on its mirror image. Firs law of thermodynamics (principle of conservation): energy can be transferred and transformed.
