1. Identify the following amino acid and a pH at which the structure wouldpredominate:A. Y, pH =7.0B. Y, pH = 9.8C. Y, pH = 10.2D. F, pH = 7.0E. F, pH = 9.8cooH₂N-CHCH2OH

The shown molecular structure is of tyrosine, which is also represented by one letter Y, among the…

Answered: 1. Identify the following amino acid…

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter26: Biomolecules: Amino Acids, Peptides, And Proteins

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Problem 34AP: Using both three- and one-letter codes for amino acids, write the structures of all possible...

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Using both three- and one-letter codes for amino acids, write the structures of all possible peptides containing the following amino acids: (a) Val, Ser, Leu (b) Ser, Leu2, Pro
Most amino acids have isoelectric points between 5.0 and 6.0, but the isoelectric point of lysine is 9.7. Explain why lysine has such a high value for its isoelectric point.
For alanine, Ka1=5.1105,Ka2=1.81010 . Calculate the ratios [Z]/[C+] and [Z]/[A+] at pH (a) 2.00. (b) 6.00. (c) 10.50. What is the principal species at each pH?
The amino acid His is triprotic with pK1 (α-COOH) = 1.82, pK2 (α-NH3+) = 9.17, and pK3 (side chain) = 6.00. What is the net charge on His at pH 8?
Almost all proteins are composed from a set of about _____ amino acids.a. 4b. 10c. 20d. 50 ______ amino acids are considered essential.a. 5b. 10c. 15d. 20 An amino acid that has an indole group side chain.a. Trpb. Phec. Tyrd. ProWhich of the following is the simplest amino acid?a. Alab. Glyc. Vald. ProWhich of these will not give a blue solution with Ninhydrin testa. Prob. Phec. Alad. CysA neutral molecule with a positive and negative electrical charge.a. Isoelectric pointb. Zwitterionsc. Bufferd. Amphoteric3 amino acids joined together by two peptide bonds.a. Dipeptideb. Tripeptidec. Tetrapeptided. PolypeptideAn amino acid that can form disulfide bondsa. Cysteineb. Methioninec. Cystined. SerineWhich of the following is not a property of amino acidsa. Bufferb. Isoelectric pointc. Zwitterionsd. Insoluble in waterThe protein primary structure is held together bya. Hydrogen bondsb. Disulfide bondsc. Peptide bondsd. Protein bonds
The pKa for the side chain amino group in lysine is 10.4. If we were working at physiological pH 7.4, what would be the ratio of the protonated to unprotonated versions of lysine? a. 1000:1 b. 3:1 c. 1:1000 d. 1:3
If an amino acid has pKa1 = 2.71 and pKa2 = 9.31, at what pH value in aqueous solution would the predominant form of this amino acid be a zwitterion? Please explain your answer and show your work. a) 6.01 b) 2.71 c) 5.65 d) 12.02 e) 9.31
Which amino acid has a net charge of +0.09 at pH 7? Show all calculations. Draw the structure of the amino acid that would predominate at this this pH. Circle all atoms that can be involved in making hydrogen bonds at pH 7
Draw a structural formula for the form of amino acid most prevalent at pH 1.0. (a) Methionine
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?apKa of 3.3. The amino group of alanine has a p?apKa of 8.8. Estimate the ratio of the concentration of the neutral amino acid species to the zwitterionic species at pH 7.
5. Which amino acid listed in the pKa table may behave as a zwitterion at a pH of 7.0-7.4?
10. Use the information in the table below to draw the structure of the predominant form of each amino acid at physiological pH (pH = 7.4) R side chain pKa (a-COOH) -CH₂CH(CH3)2 -(CH2)4NH2 -(CH2)2CO2H Amino acid Leucine Lysine Glutamic acid L-leucine L-lysine L-glutamic acid 2.36 2.18 2.19 pKa (α-NH3*) pKa (side chain) 9.60 8.95 9.67 10.79 4.25

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1. Identify the following amino acid and a pH at which the structure would predominate: A. Y, pH =7.0 B. Y, pH = 9.8 C. Y, pH = 10.2 D. F, pH = 7.0 E. F, pH = 9.8 coo H₂N- C H CH2 OH