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Concept explainers
(a)
Interpretation: For the tripeptide
Concept introduction: A compound possessing three amino acids joined together by two peptide bonds is known as tripeptide. The amino acid naming sequence begins at the N-terminal amino acid residue.
(b)
Interpretation: For the tripeptide
Concept introduction: A compound possessing three amino acids joined together by two peptide bonds is known as tripeptide. The C-terminal amino acid residue is located at the far right of the peptide.
(c)
Interpretation: The number of peptide bonds present in the tripeptide
Concept introduction: A covalent bond that is formed by joining the carboxyl group of one amino acid with the amino group of second amino group is known as peptide bond.
(d)
Interpretation: The number of amide linkages present in the tripeptide
Concept introduction: A covalent bond that is formed by joining the carboxyl group of one amino acid with the amino group of second amino group is known as pepetide bond.
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Chapter 9 Solutions
Organic And Biological Chemistry
- For the tripeptide GlyAlaCys a. What amino acid is located at the peptides N-terminal end? b. What amino acid is located at the peptides C-terminal end? c. How many peptide bonds are present? d. How many amide linkages are present?arrow_forwardAt room temperature, amino acids are solids with relatively high decomposition points. Explain why.arrow_forwardWhat special role does the amino acid cysteine have in the peptides vasopressin and oxytocin?arrow_forward
- 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 linkagesarrow_forwardWhat characteristics indicate that amino acids exist as zwitterions?arrow_forwardWhich of the following are true concerning the chemical bond that forms between the carboxyl (RCOOH) group of one amino acid and the amino (RCNH2) group of another? a.The bond is called a peptide bond. b.It is formed by inserting a water molecule between them. c.It is formed by a dehydration reaction. d.A polypeptide has more of these bonds than a protein.arrow_forward
- 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_forwardWhat functional groups are present in all -amino acids?arrow_forwardFor the tripeptide SerArgIle which amino acid residues a. are hydrophilic b. are hydrophobic c. possess polar neutral R groups d. participate in two amide linkagesarrow_forward
- Consider 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_forwardWhich of the following describes the primary structure of proteins? a. The collective shape assumed by all of the chains in a protein containing multiple chains. b. The folding of an individual protein molecule. c. The regular repeated shape of the protein molecules backbone. d. The sequence of amino acids bonded together by peptide bonds.arrow_forwardWhat element is always present in proteins that is seldom present in carbohydrates and lipids?arrow_forward
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