Q19 Which of the following interactions would be seen between the R-groups of His and Gln at pH 8?electrostatic interaction between the negative charge on the Gln carboxylate and the positive charge on theHis nitrogenO hydrogen bond between the oxygen of Gln and the nitrogen of HisO hydrogen bond between the nitrogen of Gln and the nitrogen of HisO hydrogen bond between the oxygen of Gln and a the N-H hydrogen of HisO hydrogen bond between the N-H hydrogen of Gln and the N-H hydrogen of His

Amino acids are biomolecules that have an amino group and a carboxyl group linked to the same carbon…

Answered: Which of the following interactions…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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The OH group of the serine side chain (R-OH) can undergo dissociation to form R-O- and H+. However, the ratio of the protonated to unprotonated forms of this group at pH 7 is approximately 1,000,000 to 1. Calculate the pKa of the serine OH group.
Consider the following dipeptides: AC HE TG LR VK How many of the dipeptides in this group that would stick to an anion exchange column at pH-8? Please give me the whole number as the answer, 0, 1, 2 etc Amino Acid pKac pKaN pKaR 9.8 9.9 97 2.4 Glycine Alanine 23 Valios 222
Which of the following statements concerning the titration curve of glycine is correct? 2.0 E 1.5 1.0 0.5 B 4 6 8 10 pH Point C represents the region where the net charge on glycine is zero. Point D represents the pK of glycine's carboxyl group. Point E represents the pl for glycine. Point A represents the region where glycine is deprotonated. Point B represents a region of minimal buffering. Equivalents OH added
What is the net average charge on the predominant form of lysine at pH values of (a) 2.0, (b) 5.0 and (c) 7.0? CLUE: draw the structure of lysine and show its different charged forms; then consider in which pH domains the pKa values for deprotonation/protonation occur.
In observing a Haworth or cyclohexane-chair representation of alpha-d-glucopyranose, the anomeric carbon can de best identified by: a) the carbon atom which is bonded to the most H atoms b) the carbon atom which is bonded to the least H atoms c) The carbon atom which has its OH group pointing down d) The carbon atom which is bonded to two oxygen atoms Cellulose differs from amylose in that: a) cellulose has 1-6 branches while amylose does not b) amylose has 1-6 branches while cellulose does not c) amylose has alpha glycosidic bonds while cellulose has beta glycosidic bonds d) cellulose contains sulfate while amylose does not. The glycosaminoglycan (mucopolysaccharide) which is not normally associated with joint tissue is: a) heparin b) keratan sulfate c) chondroitin sulfate d) hyaluronic acid In glycoproteins, which amino acid does not bond sugar molecules? a) Asn b) Ser c) Thr d) Gly Which feature do all lipid molecules share in common? a) fatty acid molecules…
a What bond is hydrolyzed in the synthesis of CAMP? the bond between the carbon atom of ribose and the nitrogen atom of adenosine the bond between the a phosphorus atom and the oxygen atom of ribose the phosphate anhydride bond between the 3 and y phosphorus atoms the phosphate anhydride bond between the a and phosphorus atoms Submit b What bond is formed in the synthesis of CAMP? the bond between the B-phosphorus and the 5'- hydroxyl group of ribose the bond between the B-phosphorus and the 3'- hydroxyl group of ribose the bond between the a-phosphorus and the 5'- hydroxyl group of ribose the bond between the a-phosphorus and the 3'- hydroxyl group of ribose
Draw two different possible hydrogen-bonding interactions between two molecules of formamide (HCONH2). Clearly label the hydrogen-bond donor and acceptor atoms. Which of these two possible hydrogen-bonding interactions is more likely to occur? (Hint: Consider resonance structures for formamide.)
Draw dipeptide Arg-Thr at pH 6.0. Circle the six atoms that are restricted in one plane. Calculate its approximate pI assuming pKa for NH3+ is 10.0, pKa for COOH is 3.0, PKR for Arg is 12.0
Place each charge form of alanine under the pH condition where it would be the predominant form. The pK₁ values for the carboxyl group and amino group of alanine are approximately 2.3 and 9.7, respectively. pH 11 H | H₂C-C-COO NH₂ Does not occur in significant amounts at any pH
Based on the following titration table of Glycine, would you be able to recreate the same for Histidine? Increasing pH – Glicina H H-N-CH,-COOH = H-N-CH,-CO0- = H-N-CH,-coo- H H Net charge: +1 -1 pH COOH-pKa = 2.3 NH3-pKa = 9.6 CN ΔΕ +1 +1 2.3 (0.5*-1)+(0.5*0)=-0.5 +1 +0.5 0.5 9.6 -1 (0.5*+1)+(0.5*0)=+0.5 -0.5 1.5 14 -1 -1 2 Given that the pKas for Histidine are the following: pka1 = 1.82 pKa2 = 9.17 pКа3 %3D 6.00 pl = 7.59
The enzyme lysozyme hydrolyzes glycosidic bonds in peptidoglycan, an oligosaccharide found in bacterial cell walls. The active site of lysozyme contains two amino acid residues essential for catalysis: E35 and D52. Which of the following statements about lysozyme is true? More than one may apply The graph shows the pH-activity profile of lysozyme. 100 50 4. 6. 8. 10 pH Residue E35 exhibits general base catalysis O The pKa of E35 is approximately 4.3 O The pKa of D52 is approximately 4.5 O The optimal activity of lysozyme is approximately 5.2 Residue E35 exhibits covalent catalysis The pka of E35 is approximately 6.1 The pka of D52 is approximately 3.7 Activity (% of maximal)
Draw the tripeptide gly-glu-phe with all ionizable groups in their predominant state at pH 7.0.

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