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Homework answers / question archive / CHEM 404 Spring 2021 Discussion Exercise 15 May 10, 2021 1
CHEM 404 Spring 2021 Discussion Exercise 15 May 10, 2021 1. In our first two weeks of class, we learned about nucleosynthesis in stars and learned about the relative abundance of the elements. What might this have to do with transition metals in biochemistry? 2. Some of the metals that are toxic to biological organisms are Cd2+, Hg2+, and Pb2+. What (besides their charge) do these ions have in common? If they were to bind to amino acid side chains, which amino acids would they most likely bind to? 3. a. When O2 binds to hemoglobin, it effectively becomes O2–. Draw a molecular orbital diagram for O2 and identify which molecular orbitals the extra electron would end up in. b. If the electron comes from a high-spin Fe2+, what orbital does the electron come from? What does this suggest about the relative energies of the Fe 2+ and O2 molecular orbital energies? Remember that electrons always want to go to the lowest energy level available. 4. a. NO is used in signaling in biological systems. Draw a molecular orbital diagram for NO and NO+. What other heteronuclear diatomic molecules is NO like? b. If you know where these other heteronuclear diatomic molecules bind in biological systems, you can probably guess what a NO-binding metalloprotein might look like. Any ideas?
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