15.78 Protein shapes are maintained by a variety of forces thatarise from interactions between the amino-acid R groups. Namethe amino acid that possesses each R group and the force thatcould arise in each of the following interactions:(а) — СН,—SH with HS—CH,-(b) –(CH,),-NH,* witho-C-CH,-(с) — СН,—С—NH2 withHO-CH2-CH3(d) -CH-CH, with-CH,-

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Answered: 15.78 Protein shapes are maintained by…

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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I don't get it at all. I struggled with my homework. Can you help me about the Henderson-Hasselbalch relation, summarized in the table below, it is possible to predict the predominant form of these groups at a particular pH? Draw the line bond structure for the general form of an amino acid using "R" to represent the side chain. Draw the N- and C-terminus groups using the forms that are predominant at physiological pH (pH = 7.4. Include lone pairs in your drawing.
Alanine is one of the 20 amino acids (it contains both an amino and a carboxyl group) found in proteins - \, Is alanine better represented by structural formula A or B? Explain. CH-CH-Ö-OH CH-CH-Ö-o- NH, NH3" (A) (B)
Plz explain to me. At the second midpoint of a diprotic amino acid, it will be a) In equal proportions with its conjugate base after the first ionization. b) In unequal proportions with its conjugate base. c) Completely protonated. d) Completely deprotonated.
What type of amino acid has a side chain that contains –COO–? polar neutral nonpolar acidic basic conjugate basic
(a) Why can’t two purine bases (A and G) form a base pair and hydrogen bond to each other on two strands of DNA in the double helix? (b) Why is hydrogen bonding between guanine and cytosine more favorable than hydrogen bonding between guanine and thymine?
Complete the table for the ionizable groups of the fictitious amino acid hypothetinine. Group alpha-amino alpha-carboxyl Ka 5.24 x 10-⁹ 2.13 x 10-3 pKa (to TWO decimals) 8.9 2.7 Average charge of group when pH=pK (to ONE decimal) -0.5 +0.5
Complete the table for the ionizable groups of the fictitious amino acid hypothetinine. pka (to TWO decimals) Average charge of group when pH=pK (to ONE decimal) Group Ka alpha-carboxyl 1.38 x 103 alpha-amino 6.02 x 10-10
As we’ve discussed, a peptide bond is made when amino group of one amino acid combines with the carboxylic acid group of another amino acid (releasing a water molecule in the process). The C-N bond formed in this process is called a peptide bond. Peptide bonds have a few properties that might be unexpected. a) One property is that the molecular geometries around the C and N atom in the peptide bond are generally planar with bond angles of approximately 120 degrees. Provide an explanation for why the peptide bond would have this property, using Lewis structures, VSEPR theory and/or valence bond theory as appropriate.
The amino acid histidine has ionizable groups with pK, values of 1.8, 6.0, and 9.2, as shown. COOH H₂N-CH CH, H pH = 1.29 COO H₂N-CH 1.8 CH pk, lonizable -COOH-COO- group Incorrect CH, H COO H₂N-CH 6.0 CH pk, CH, H H N CH -HisH¹-His COO H₂N-CH NH - NH, A biochemist makes up 85 mL of a 0.10 M solution of histidine at a pH of 5.5. She then adds 60 mL of 0.10 M HCI. What is the pH of the resulting solution? CH, H 9.2 C pk CH Macmillan Iraming T im be the [His IM.
Net Charge on an Amino Group.The amino acid glycine has hydrogen as its side-chain (R) group. Values of pKca= 2:36 and pKaa=9:56 have been previously reported for glycine. Superscripts c, a, and s refer to a-carboxylic acid, α-amino base, and side chain, respectively. Using these values, determine the net charge on the a-amino group of glycine at a physiologic pH of 7.2 and a pH of 3 [70].
For the amino acid alanine, the major species in solution at pH 7 is the zwitterionic form, which has a negatively charged carboxylic acid group and a positively charged amino group. There is a less common neutral form in which neither group is charged. The carboxylic acid group of alanine has a p?a of 3 The amino group of alanine has a p?a of 8 Estimate the ratio of the concentration of the neutral amino acid species to the zwitterionic species at pH 7. __?__x10^?
Indicate whether each statement is true or false. (a) Thesequence of amino acids in a protein, from the amine endto the acid end, is called the primary structure of the protein.(b) Alpha helix and beta sheet structures are examplesof quaternary protein structure. (c) It is impossiblefor more than one protein to bind to another and make ahigher order structure.

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