8B_quiz9b-key

8B_quiz9b-key - Chem 8B winter 2008 Quiz#9B Name_KEY(Last First(print clearly TA name or section DO NOT start the quiz until you are instructed You

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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] _________
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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?
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/12/2009 for the course CHE 8B taught by Professor Lievens during the Winter '07 term at UC Davis.

Page1 / 4

8B_quiz9b-key - Chem 8B winter 2008 Quiz#9B Name_KEY(Last First(print clearly TA name or section DO NOT start the quiz until you are instructed You

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online