Biology HMWRK 1 - Biology 5A Homework 1 January 6-8 2010 1...

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Biology 5A Homework 1 January 6-8, 2010 1. In lecture, we used Roger & Anita, Pongo & Perdita from “101 Dalmatians” as an analogy to better understand the covalent bond in the hydrogen molecule, H-H. Apply the same analogy to understand the covalent bond between O and H in the molecule R-O-H (R is used as a generic, or general, representation of the rest of the molecule when its details are not important to the matter at hand). Let Roger represent the H nucleus, Anita represent the O nucleus, and Pongo & Perdita represent the valence shell electrons involved in the covalent bond. Which of the following statements is true? (HINT: Electronegativity is the tendency for an atom to pull electrons towards itself. Among the four most important atoms in biology, O is the most electronegative, N is slightly less electronegative, C is much less electronegative, and H is still a bit less electronegative. In symbols, O>N>>C>H. In a covalent bond between atoms of distinctly different electronegativities, the shared pair of electrons making the covalent bond will be pulled a bit towards the more electronegative atom. Thus in a C-N covalent bond, the electrons will be pulled a bit more towards N than towards C.) A. Pongo spends more time around Roger, and Perdita spends more time around Anita. B. Pongo & Perdita spend equal time around both Roger & Anita. C. Perdita spends more time around Roger, and Pongo spends more time around Anita. D. Pongo & Perdita both spend more time around Roger than around Anita. E. Perdita & Pongo both spend more time around Anita than around Roger.
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