Concept explainers
Interpretation:
Enzyme catalysed decarboxylation of Glutamic acid gives 4-aminobutanoic acid. The
Concept Introduction:
The isoelectric point of an amino acid is
If the amino acids contains side chains, then for acidic side chain amino acids
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Chapter 27 Solutions
OWLv2 with MindTap Reader, 1 term (6 months) Printed Access Card for Brown/Iverson/Anslyn/Foote's Organic Chemistry, 8th Edition
- Which 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_forwardConsider 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_forwardBesides the Boc and Fmoc protecting groups used in peptide synthesis, amines can also be protected by reaction with benzyl chloroformate (C6H5CH2OCOCl). Draw the structure of the product formed by reaction of alanine with benzyl chloroformate.arrow_forward
- alanine is dissolved in a solution with a pH of 4.2. what percent of the alanine's carboxyl groups are de - protonated at this pH? What percent of the carboxyl groups are protonated?arrow_forwardTreating chitin with H2O, -OH hydrolyzes its amide linkages, forming a compound called chitosan. What is the structure of chitosan? Chitosan has been used in shampoos, bers for sutures, and wound dressings.arrow_forwardWhich of the following is/are true? Methionine is an essential amino acid Valine contains two chiral carbons Glycine is an achiral amino acid The alpha-amino group and the alpha-carboxyl group of an amino acid can be neutral at a particular pH.arrow_forward
- Explain why a peptide C-N bond is stronger than an ester C-O bond.arrow_forwardAll amino acids share a common structure, a central (alpha) carbon with four groups attached. Which of these is NOT one of the four groups attached to the alpha- carbon? O an R group an ammonium group (-NH3+) O a carboxylate group (-COO) a hydronium grouparrow_forwardAncient peoples used salicin to reduce fevers. Write an equation for the acid-catalyzed hydrolysis of the glycosidic bond of salicin. Compare the aromatic product with the structure of acetylsalicylic acid (aspirin). Use this information to develop a hypothesis explaining why ancient peoples used salicin to reduce fevers.arrow_forward
- Cholic acid is secreted in bile as an amide linked to the aminogroup of glycine. This cholic acid–amino acid combination acts asan emulsifying agent to disperse lipids in the intestines for easierdigestion. Draw the structure of the cholic acid–glycine combination,and explain why it is a good emulsifying agent.arrow_forwardCholesterol is reacted with acidified potassium dichromate. Determine the structure of the product formed and explain if further oxidation can occur.arrow_forwardDraw and name the type of bond that forms between amino and carboxyl groups in peptides.arrow_forward
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