• Which is the most predominant form(s) of Cysteine at the point A on the titration curve? [Select] • Identify which form (among the given above) would Cys assume when the solutions's pH is at its pl [ Select] and • Identify the pl (isoelectric point) of this amino acid on the graph: it is marked as [Select] on the graph. Point A on graph Point B on graph Point C on graph Point D on graph Point E on graph Point F on graph Question 7

• Which is the most predominant form(s) of Cysteine at the point A on the titration curve? [Select] • Identify which form (among the given above) would Cys assume when the solutions's pH is at its pl [ Select] and • Identify the pl (isoelectric point) of this amino acid on the graph: it is marked as [Select] on the graph. Point A on graph Point B on graph Point C on graph Point D on graph Point E on graph Point F on graph Question 7

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Name: Postlab Questions: 1. A student was performing the test for chloride in his unknown. When he added the five drops of HNO3, he observed bubbles forming (effervescence) in his unknown. Was chloride present in his unknown? How do you know? 2. A student added barium chloride to her unknown and immediately witnessed the formation of a precipitate. She concluded that this white precipitate indicated the presence of chloride ion in her unknown. Is she correct? How do you know? 3. A student has two unlabeled bottles of solution. One contains PO4³¯ and the other SO,?". How can this student identify which is which? Page 6 of 6
Y Do you predict that this salt bridge will become stronger, become weaker, or be unaffected as pH increases from pH-7.2 to pH=7.97 The salt bridge will become stronger. The salt bridge will become weaker. The salt bridge will be unaffected. Previous Answers Correct At pH=7.2 the glutamic acid (Glu) side chain will carry a charge of -1 (at 3 pH units above the pK, for Glu, the side chain will be almost fully ionized whereas the histidine (His) side chain will carry a charge of < 0.5 (at pH pK, the charge on His would be +0.5; since pH 7.2 is above its pK, it will carry less (+) charge as it becomes more deprotonated). As the pH increase to 7.9, the charge on Glu will remain-1 and the charge on His will decrease; thus, this salt bridge is predicted to become weaker as pH is raised from 72 to 7.9. Part B Justify your answer with calculations of partial charges on these amino acid side chains at pH 7.2. (Hint: Consider lessons from Coulomb's law, and the Henderson Hasselbalch equation)…
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