8B_quiz9b-key - Chem 8B winter 2008 Quiz#9B Name_KEY(Last...

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Chem 8B, winter 2008 Name: _____ __ _ KEY _______________ Quiz #9B (Last, First) ( print clearly) TA name or section #: ______________________________ • DO NOT start the quiz until you are instructed. • You must stop writing and turn in your quiz when time is called. • Ambiguous or incomplete answers will not get full credit. • Please give clear and concise answers – a single sentence or phrase should be sufficient to accurately convey the information required. “Brevity is the soul of wit” – Shakespeare Problem # Score 1. [12] ________ 2. [10] ________ 3. [8] ________ 4. [10] ________ Total [40] ________/40 Bonus [5] _________
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Chem 8B, quiz 9B 1. (2 pts each) Multiple choice questions: (i) Which of the following is NOT a true statement about alpha-amino acids? a) Amino acids undergo and intramolecular acid-base reaction and exist primarily in the form of a dipolar ion, called a zwitterions. b) Amino acids are the hydrolysis products of peptides and proteins. c) Amino acids are amphoteric because they act like both an acid and a base. d) Amino acids give a positive biuret test with copper (II) solution. e) Amino acids can be separated by electrophoresis. (ii) What is an amino acid s isoelectric point? a) The pH at which the amino acid favors formation of an amide bond b) The pH at which the amino acid exists primarily as the neutral, dipolar zwitterion c) The pH at which the amino acid exists in the fully deprotonated form d) The pH at which the amino acid exists in the fully protonated form e) The pH at which a mixture of amino acids can be separated using electrophoresis (iii) If an amino acid has a pI of 3.2, how will this amino acid migrate on electrophoresis when the pH is buffered at 5.5?
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