Concept explainers
What is the predominant form of each of the following amino acids at
(a)
Interpretation: The predominant form of threonine at
Concept introduction: At isoelectric point, the amino acids exist in their neutral form. The amine groups exists as
Answer to Problem 29.36P
The predominant form of threonine at
The overall charge on it is
Explanation of Solution
At isoelectric point, the amino acids exist in their neutral form. The amine groups exists as
The isoelectric point of threonine is
Figure 1
The overall charge on threonine at
The predominant form of threonine at
(b)
Interpretation: The predominant form of methionine at
Concept introduction: At isoelectric point, the amino acids exist in their neutral form. The amine groups exists as
Answer to Problem 29.36P
The predominant form of methionine at
The overall charge on it is
Explanation of Solution
At isoelectric point, the amino acids exist in their neutral form. The amine groups exists as
The isoelectric point of methionine is
Figure 2
The overall charge on methionine at
The predominant form of methionine at
(c)
Interpretation: The predominant form of aspartic acid at
Concept introduction: At isoelectric point, the amino acids exist in their neutral form. The amine groups exists as
Answer to Problem 29.36P
The predominant form of aspartic acid at
The overall charge on it is
Explanation of Solution
At isoelectric point, the amino acids exist in their neutral form. The amine groups exists as
The isoelectric point of aspartic acid is
Figure 3
The overall charge on aspartic acid at
The predominant form of aspartic acid at
(d)
Interpretation: The predominant form of arginine at
Concept introduction: At isoelectric point, the amino acids exist in their neutral form. The amine groups exists as
Answer to Problem 29.36P
The predominant form of arginine at
The overall charge on it is
Explanation of Solution
At isoelectric point, the amino acids exist in their neutral form. The amine groups exists as
The isoelectric point of arginine is
Figure 4
The overall charge on arginine at
The predominant form of arginine at
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Chapter 29 Solutions
Organic Chemistry
- 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?arrow_forward22-42 (a) How many atoms of the peptide bond lie in the same plane? (b) Which atoms are they?arrow_forwardConsider the tripeptide tyrosylleucylisoleucine. 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 an acidic side chain?arrow_forward
- What special role does the amino acid cysteine have in the peptides vasopressin and oxytocin?arrow_forwardOn complete hydrolysis, a polypeptide gives two alanine, one leucine, one methionine, one phenylalanine, and one valine residue. Partial hydrolysis gives the following fragments: Ala-Phe, Leu-Met, Val-Ala, Phe-Leu. It is known that the first amino acid in the sequence is valine and the last one is methionine. What is the complete sequence of amino acids?arrow_forward22-21 Explain why an amino acid cannot exist in an un-ionized form at any pH.arrow_forward
- 22-9 What is the difference in structure between tyrosine and phenylalanine?arrow_forward22-91 Which amino acid does not rotate the plane of polarized light?arrow_forward22-89 What kind of noncovalent interaction occurs between the following amino acids? (a) Valine and isoleucine (b) Glutamic acid and lysine (c) Tyrosine and threonine (d) Alanine and alaninearrow_forward
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