2. In the space provided, draw the structure of valine (val) at each of the following pH values.Valine has a pl of 5.97.CH₁CH-CH,H₂N-C-COOHHa) pH = 4.34Valine (Val)b) pH = 5.97

Step 1:At very low pH, the amino acid like Valine exist as cation because it has a net charge of +1…

Answered: 2. In the space provided, draw the…

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter22: Organic Chemistry And Biochemistry

Section: Chapter Questions

Problem 80QE

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What special role does the amino acid cysteine have in the peptides vasopressin and oxytocin?
Draw a segment of the backbone of a protein that is long enough for three peptide linkages to be present.
For the tripeptide AlaValGly which amino acid residues, if any, a. are hydrophilic b. are hydrophobic c. possess nonpolar R groups d. participate in two amide linkages
What characteristics indicate that amino acids exist as zwitterions?
For the tripeptide SerArgIle which amino acid residues a. are hydrophilic b. are hydrophobic c. possess polar neutral R groups d. participate in two amide linkages
Consider the tripeptide leucylvalyltryptophan. a. Specify its structure using three-letter symbols for the amino acids. b. How many peptide bonds are present within the peptide? c. Which of the amino acid residues has the largest R group? d. Which of the amino acid residues, if any, has a basic side chain?
Draw the sequential transition of glutamic acid as it passes from its fully protonated form to its fully deprotonated form as the pH rises. If the pH of an amino acid solution is lowered by adding an acid, like , the group of glutamic acid accepts the proton, acid, to form a positive ion.
What type of amino acid has a side chain that contains –COO–? polar neutral nonpolar acidic basic conjugate basic
Which of the following is true concerning the amino acid shown here? || H3N-CH-C-o A) The pH is below the pl. CH2 B) The pH is above the pl. C) The pH has the same value as the pl. D) It is not possible to determine the pH.
2. Classify the following amino acids as nonpolar, polar basic, polar acidic, or polar neutral. (a) (b) (c) (d) H₂N-CH-COH CH-OH I CH3 || H₂N-CH-C-OH I CH₂ C=O 1 OH H₂N-CH-C-OH CH₂ T CH-CH3 CH₂ H₂N-CH-C-OH ī CH₂ OH 229
Consider the amino acid valine, whose pKavalues are given below. (a) Draw the major form of valine when in a solution of pH = 6.0. (b) Draw the major form of valine when in a solution of pH = 12.0
If the pH of the solution is equal to isoelectric point of protein, the net charge of the protein is positive or negative?

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2. In the space provided, draw the structure of valine (val) at each of the following pH values. Valine has a pl of 5.97. CH₁ CH-CH, H₂N-C-COOH H a) pH = 4.34 Valine (Val) b) pH = 5.97