BS 161 1st Edition Lecture 1 Outline of Last Lecture I Introduction to course overview of syllabus Outline of Current Lecture II Introduce four themes for understanding cellular biology III Review biologically important parts of inorganic chemistry Current Lecture Main themes of cell and molecular biology 1 Matter 2 Energy 3 Organization 4 Information Review from chemistry atomic number number of protons atomic weight mass protons and neutrons Types of bonds the number and type of bond determines the shape and stability of a molecule as well as its interactions with other molecules Covalent strong Double covalent very strong Hydrogen weak very abundant strength in numbers Van der Waals very weak hydrophobic doesn t like to be where water is Ionic moderately strong attraction due to charges opposites attract Chemistry of water polar molecule electronegative polar covalent bonds good solvent for hydrophobic or charged molecules makes a hydration shell around proteins and other hydrophilic water loving molecules Hydrophobic water fearing nonpolar Hydrophilic water loving polar some macromolecules are so large that it can have parts that are hydrophobic and hydrophilic pH pH log H closer to 0 acidic 7 neutral closer to 14 basic
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