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Lecture 2

BIOL 1000 Lecture 2: Lecture 2

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Biological Sciences
BIOL 1000
Kevin G.Scott

o982 Dry salt crystal is very strong, when placed in water ionic bonds break Most drugs are made as salts (stable when dry, dissolve easily in water) Hydrogen bonds are weak bonds important in the chemistry of life Most strong bonds in living organisms are covalent, intramolecular Intermolecular (weaker) bonds are also important to cell functioning (e.g. ionic)   Large molecules are held in 3D shape by weak bonds Atoms connected by polar covalent bonds (with partial positive charge) are attracted to nearby negative atoms of other molecules –by weak bonds  Hydrogen bond = bond formed between negatively charged oxygen in one water molecule, with  positively charged hydrogen in neighboring water molecule Help to create a protein’s shape Hold 2 strands of DNA molecules together Chemical reactions make and break chemical bonds  Structure of atoms/molecules determines the way they behave  Chemical behaviour of an atom determined by structure of its electrons Chemical reaction = breaking and making of chemical bonds that leads to changes in the composition of matter   used to symbolize this process Reactants = starting materials Product = material resulting from chemical reaction  Chemical reactions do NOT create or destroy matter, balanced number of atoms of each element on either side of reaction equation Hydrogen bonds make
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