320Fall09Homework1_key - Cell Biology(BIO 320 Fall 2009 Dr...

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Cell Biology (BIO 320), Fall 2009, Dr. Bushart Homework set #1 key 1. Dissolving solid urea in water is an endothermic reaction (+ΔH) yet it still occurs spontaneously at room temperature. a. How would heating the water help this process? Higher temperatures increase the subtracted value of “T Δ S, which needs to be larger than the value of Δ H in order for the reaction to be spontaneous. b. Even at room temperature this process will occur. How can we explain this in terms of the free energy equation? Note that you should be able to answer this without looking up the specific details of how urea dissolves (which does help explain it too). Solid urea is ordered. Dissolved urea is going to be disordered since it is mixed up with water. The change in entropy is therefore favorable even if H is not. 2. Imagine you have located one half of an attractive amino acid side chain pairing important for the function of a protein.
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