9-5-08_macromolecules1A

9-5-08_macromolecules1A - Peace is a daily, a weekly, a...

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“Peace is a daily, a weekly, a monthly process, gradually changing opinions, slowly eroding old barriers, quietly building new structures .” – President John F. Kennedy
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Announcements Please rank your papers for research summary by September 12 th Go to Blackboard, Assessments, then Research Paper Rankings 1. This is an ungraded survey for which you fill out your top choice as True and the rest as False. The papers are in the folder Papers for Written Assignments The research summary will be a 5 page double spaced summary of the significance and techniques used in the research. “How would I explain this paper to my grandmother?” More details to follow
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The key to bonds - sharing
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Electronegativity reflects the tendency of an atom to attract an electron More nuclear protons, more electronegative More distance of outer electrons from nucleus, less electronegative O, N, Cl, are very electronegative biomolecules (Why?)
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Covalent bonds are polar when one atom is more electronegative than the other Top: Covalent C-C bond, equal charge distribution between atoms. Middle: Covalent N-B bond, unequal distribution between atoms. Nitrogen is more electronegative Bottom: Ionic Li-F bond, in which F has has taken an electron from Li. Fluorine is much more electronegative. http://www.chemistry.mcmaster.ca/
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The most important polar molecule is water Oxygen is more electronegative than hydrogen, so the hydrogen are effectively partially positively charged and the oxygen is partially negatively charged.
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Strength in numbers: Ionic and Hydrogen bonds In this example, ionic bonds between the phosphate backbone of the DNA and the amine of the protein are present . Also, hydrogen bonds are what hold the complementary DNA strands together. Why would H bonds be useful? Many H bonds that can easily be broken and reformed give great overall strength of DNA strands holding together yet flexibility to unzip them in specific locations with relatively little energy expenditure.
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Hydrophobic interactions are very important for understanding dynamics in and around lipid membranes Hydrophobic molecules are non- polar, mainly composed of hydrocarbons with low and comparable electronegativities. Hydrophobic molecules do not
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9-5-08_macromolecules1A - Peace is a daily, a weekly, a...

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