BIOL 1107 1nd Edition Lecture 1 Outline of Last Lecture I. List of items needed for Biol1107 labII. Where do you find homework for Bio1107?III. Teacher’s Contact Info and Office HoursOutline of Current Lecture I. Biology & ChemistryII. Define Important TermsIII. Molecular InteractionsCurrent LectureI. Biology & ChemistryIn chemistry, the molecules we deal with are usually very small.However, in biology, we use much larger molecules (as large as 110 Daltons/ amu)A typical protein can range from 25 histones to 200kDa (neurofilament)II. Important TermsIonic: charged molecule (loses or gains electrons)Covalent: sharing of electrons (type of bond)Polar: different electronegativities; share electrons unevenlyNon-polar: sharing electrons equally Elements in human body- look at Table 2.1 in textbook (page. 32)Various different electronegativities:Oxygen = 3.5Nitrogen = 3.0Carbon = 2.5Hydrogen = 2.1These four elements are key elements and make up 96% of living matter.Which of these is most polar?These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.(a) Diatomic oxygen molecule(b) Methane(c) Water moleculeAnswer: (c) water molecule is polar; it is very important in biology, body is 70% water. (a) and (b) are both nonpolar molecules. Identify atoms with “strong” partial chargesWhat kind of molecule is this?As indicated above, this molecule is both polar and non-polar covalent.III. Molecular InteractionsIonic:Hydrogen bonding:Covalent:Van der Waals (London dispersion): all molecules have
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