Chemistry: Principles and Reactions
8th Edition
ISBN: 9781305079373
Author: William L. Masterton, Cecile N. Hurley
Publisher: Cengage Learning
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Chapter 23, Problem 52QAP
Aspartic acid acts as a triprotic acid with successive dissociation constants of
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What is the actual chemical component for an anthocyanin (assume a cyanidin structure), and a carotenoid (assume a lutein structure), and indicate what is the common feature of these indicators that could act as an acid or base. (While the structures are complicated molecules, compare with acetic acid, CH3COOH, a weak acid).
Consider the following data that was collected for a protein that contain 0.76 % tryptophan amino acids by weight (Molecular weight of tryptophan amino acids is 204 g/mol).
Absorbance
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0.0250
0.100
0.150
0.226
0.259
0.400
0.600
0.964
1.14
1.78
1.45
2.35
1.78
2.87
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at a pH value of 2, the amino and carboxyl groups in an amino acid will exist as
Chapter 23 Solutions
Chemistry: Principles and Reactions
Ch. 23 - Prob. 1QAPCh. 23 - Prob. 2QAPCh. 23 - Prob. 3QAPCh. 23 - Prob. 4QAPCh. 23 - Prob. 5QAPCh. 23 - Prob. 6QAPCh. 23 - Prob. 7QAPCh. 23 - Prob. 8QAPCh. 23 - Prob. 9QAPCh. 23 - Prob. 10QAP
Ch. 23 - Prob. 11QAPCh. 23 - Prob. 12QAPCh. 23 - Prob. 13QAPCh. 23 - Prob. 14QAPCh. 23 - Prob. 15QAPCh. 23 - Prob. 16QAPCh. 23 - Prob. 17QAPCh. 23 - Prob. 18QAPCh. 23 - Prob. 19QAPCh. 23 - Prob. 20QAPCh. 23 - How many chiral carbon atoms are there in ...Ch. 23 - How many chiral carbon atoms are there in sucrose?...Ch. 23 - Prob. 23QAPCh. 23 - Give the structural formulas of two different...Ch. 23 - (a) How many tripeptides can be made from glycine,...Ch. 23 - Prob. 26QAPCh. 23 - Prob. 27QAPCh. 23 - Prob. 28QAPCh. 23 - For alanine, Ka1=5.1105,Ka2=1.81010 . Calculate...Ch. 23 - Prob. 30QAPCh. 23 - On complete hydrolysis, a polypeptide gives two...Ch. 23 - Prob. 32QAPCh. 23 - Prob. 33QAPCh. 23 - Prob. 34QAPCh. 23 - Prob. 35QAPCh. 23 - Prob. 36QAPCh. 23 - Prob. 37QAPCh. 23 - Prob. 38QAPCh. 23 - Prob. 39QAPCh. 23 - Prob. 40QAPCh. 23 - Prob. 41QAPCh. 23 - Sketch the form in which leucine would exist in...Ch. 23 - How many tripeptides could one make from glycine,...Ch. 23 - A 1.00-mg sample of a pure protein yielded on...Ch. 23 - Describe what is meant by (a) the primary...Ch. 23 - Glycolysis is the process by which glucose is...Ch. 23 - Plants synthesize carbohydrates from CO2 and H2O...Ch. 23 - Prob. 48QAPCh. 23 - Prob. 49QAPCh. 23 - Prob. 50QAPCh. 23 - Prob. 51QAPCh. 23 - Aspartic acid acts as a triprotic acid with...
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- 22-62 Distinguish between intermolecular and intramolecular hydrogen bonding between backbone groups. Where in protein structures do you find one, and where do you find the other?arrow_forwardWhen aniline, C6H5NH2(Kb=7.41010) , reacts with a strong acid, its conjugate acid, C6H5NH3+, is formed. Calculate the pH of a 0.100 M solution of C6H5NH3+ and compare it with the pH of acetic acid (Ka=1.86105) .arrow_forwardWrite the structure of the given peptide: • threonyalanyltyrosine (A tripeptide made up of the amino acids: threonine, alanine and tyrosine)arrow_forward
- Write the General formula and Structure of the standard amino acids. D. Acids Aspartic acid (Asp,D) Glutamic acid (Glu, E) E. Bases Arginine (Ang, R) Histidine (His,H) Lysine (Lys,K) F. Aromatic Tyrosine (Tyr,T) Phenylalanine (Phe,F) Tryptophan (Trp,W) G. Amides Asparigine (Asn,N) Glutamine (Gln,Q)arrow_forwardWrite the General formula and Structure of the standard amino acids. A. Alkyl Glycine (Gly,G) Alanine (Ala,A) Valine (Val, V) Proline (Pro,P) Isoleucine (Ile,I) Leucine (Leu,L) B. Sulfur-containing Cysteine (Cys,C) Methionine (Met,M) C.Alcohols Serine (Ser,S) Threonine (Thr,T) D. Acids Aspartic acid (Asp,D) Glutamic acid (Glu, E) E. Bases Arginine (Ang, R) Histidine (His,H) Lysine (Lys,K) F. Aromatic Tyrosine (Tyr,T) Phenylalanine (Phe,F) Tryptophan (Trp,W) G. Amides Asparigine (Asn,N) Glutamine (Gln,Q)arrow_forwardAs the pH changes in an aqueous solution, Glutamic acid can exist in the neutral (zwitterionic) form and three different charged forms (with charge -2, -1 and +1). Draw these four forms of the molecule.arrow_forward
- 22-53 Do iron and zinc ions play role in protein structure? If so, what is the role for either or both?arrow_forward22-45 Proteins are least soluble at their isoelectric points. What would happen to a protein precipitated at its isoelectric point if a few drops of dilute HCl were added?arrow_forward
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