CHEM 3B Study Guide - Midterm Guide: Stereoisomerism, Nutrasweet, Geranyl Pyrophosphate
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You have 120 minutes to complete this exam. Please provide all answers in the space provided. Work drawn in the margins may not be picked up by the scanner and therefore will not be graded. The last page of the exam is a table of amino acids and scratch paper. Sid___________________: arginine acid-base reactivity, the amino acid arginine is shown below in the fully deprotonated protonation state. Guanidinium ion. draw two different possible structures of the guanidinium resulting from reaction with acid at different sites of guanidine. Indicate which one is more stable and explain why. (9 pt: the pka of the guanidinium group in arginine is 12. 5. Based on this information, finish the structures below to show the predominant protonation state of arginine at each ph. (9 pt) Arginine at ph = 0: complete the acid-base reaction scheme and keq calculation shown below. (15 pt)
