EBK ORGANIC CHEMISTRY
8th Edition
ISBN: 8220102744127
Author: Bruice
Publisher: PEARSON
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Textbook Question
Chapter 21.13, Problem 40P
Explain why cyanogen bromide does not cleave on the C-side of cysteine.
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Chapter 21 Solutions
EBK ORGANIC CHEMISTRY
Ch. 21.1 - a. Explain why, when the imidazole ring of...Ch. 21.2 - a. Which isomer(R)-alanine or (S)-alanineis...Ch. 21.2 - Prob. 4PCh. 21.3 - Prob. 5PCh. 21.3 - Prob. 6PCh. 21.3 - Draw the predominant form for glutamate in a...Ch. 21.3 - a. Why is the pKa of the glutamate side chain...Ch. 21.4 - Calculate the pI of each of the following amino...Ch. 21.4 - a. Which amino acid has the lowest pI value? b....Ch. 21.4 - Prob. 12P
Ch. 21.4 - Prob. 13PCh. 21.4 - Explain why the pI of lysine is the average of the...Ch. 21.5 - What aldehyde is formed when valine is treated...Ch. 21.5 - Prob. 16PCh. 21.5 - Prob. 17PCh. 21.5 - Prob. 18PCh. 21.5 - Prob. 19PCh. 21.6 - Why is excess ammonia used in the preceding...Ch. 21.6 - Prob. 21PCh. 21.6 - What amino acid is formed using the...Ch. 21.6 - Prob. 23PCh. 21.6 - What amino acid is formed when the aldehyde used...Ch. 21.7 - Esterase is an enzyme that catalyzes the...Ch. 21.8 - Draw the tetrapeptide Ala-Thr-Asp-Asn and indicate...Ch. 21.8 - Draw the resonance contributors of the peptide...Ch. 21.8 - Which bonds in the backbone of a peptide can...Ch. 21.9 - An opioid pentapeptide has the following...Ch. 21.9 - What is the configuration about each of the...Ch. 21.9 - Glutathione is a tripeptide whose function is to...Ch. 21.10 - What dipeptides would be formed by heating a...Ch. 21.10 - Suppose you are trying to synthesize the dipeptide...Ch. 21.10 - Show the steps in the synthesis of the...Ch. 21.10 - a. Calculate the overall yield of bradykinin when...Ch. 21.11 - Show the steps in the synthesis of the...Ch. 21.13 - Prob. 37PCh. 21.13 - In determining the primary structure of insulin,...Ch. 21.13 - A decapeptide undergoes partial hydrolysis to give...Ch. 21.13 - Explain why cyanogen bromide does not cleave on...Ch. 21.13 - Indicate the peptides produced from cleavage by...Ch. 21.14 - Prob. 43PCh. 21.14 - Three peptides were obtained from a trypsin...Ch. 21.14 - Prob. 45PCh. 21.15 - How would a protein that resides in the nonpolar...Ch. 21.16 - a. Which would have the greatest percentage of...Ch. 21.17 - When apples that have been cut are exposed to...Ch. 21 - Glycine has pK2 values of 2.34 and 9.60. At what...Ch. 21 - Prob. 50PCh. 21 - A titration curve is a plot of the pH of a...Ch. 21 - Prob. 52PCh. 21 - Aspartame (its structure is on page 1007) has a pl...Ch. 21 - Draw the form of aspartate that predominates at...Ch. 21 - Show how phenylalanine can be prepared by...Ch. 21 - A professor was preparing a manuscript for...Ch. 21 - What aldehydes are formed when the following amino...Ch. 21 - Prob. 58PCh. 21 - Determine the amino acid sequence of a polypeptide...Ch. 21 - Prob. 60PCh. 21 - Prob. 61PCh. 21 - Which is the more effective buffer at...Ch. 21 - Identify the location and type of charge on the...Ch. 21 - Draw the product obtained when a lysine side chain...Ch. 21 - After the polypeptide shown below was treated with...Ch. 21 - Treatment of a polypeptide with 2-mercaptoethanol...Ch. 21 - Show how aspartame can be synthesized using DCCD.Ch. 21 - -Amino acids can be prepared by treating an...Ch. 21 - Reaction of a polypeptide with carboxypeptidase A...Ch. 21 - a. How many different octapeptides can be made...Ch. 21 - Glycine has pKa values of 2.3 and 9.6. Do you...Ch. 21 - A mixture of 15 amino acids gave the fingerprint...Ch. 21 - Write the mechanism for the reaction of an amino...Ch. 21 - Prob. 74PCh. 21 - Show how valine can be prepared by a. a...Ch. 21 - The primary structure of -endorphin, a peptide...Ch. 21 - A chemist wanted to test his hypothesis that the...Ch. 21 - Propose a mechanism for the rearrangement of the...Ch. 21 - A normal polypeptide and a mutant of the...Ch. 21 - Determine the amino acid sequence of a polypeptide...
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- What molecular interactions explain the observed solubility class of urea?arrow_forwardWhich of the following statements is false concerning the structure of hemoglobin? O The R-state of Hb is favored under environments of high concentrations of O2 The binding of BPG stabilizes the low affinity state of Hb O Hemoglobin is stabilized in the low affinity state in the presence of high concentration of protons Hemoglobin's affinity for oxygen increases in the presence of carbamates O Hemoglobin favors the R-state in basic environmentsarrow_forwardExplain why glutathione is named gamma-glutamyl-L-cysteinylglycine.arrow_forward
- Oxygen is transported around the body by the globular protein hemoglobin which contains four Fe2* ions. Hemoglobin is “oxygenated" when coordinated to dissolved oxygen in the blood. This can be simplistically represented by the following equation (where Hb represents one hemoglobin molecule): н (ад) + 402 (д) + нь(02)4 (аq) (1) Hemoglobin also readily binds with carbon monoxide (CO). Indeed, hemoglobin has a much higher affinity to CO than O2 resulting in significantly stronger hemoglobin binding to CO than to O2. This is a problem because hemoglobin molecules which are coordinated to carbon monoxide are unable to transport oxygen around the body as needed. No more than 2.5% of your body's hemoglobin can be bound to CO before health effects become noticeable. The consequence is that even very low partial pressures of CO in the air have physiological implications for humans. нь (ад) + 4Cо (д) + нь(со)4 (аq) (2) Compare and evaluate the relative magnitudes of the equilibrium constant for…arrow_forwardlodoacetamide acts as an irreversible inhibitor for a few enzymes by reacting with the amino acid at the active site having the function group -NH_2 -COOH -SH -OHarrow_forward1. Among the following five types of biomolecules, which is the least common drug target for commercial drugs? (a) Enzymes (b) Receptors (c) Carbohydrates (d) Membrane transport proteins (e) DNA 2. Which is a false statement regarding non-competitive enzyme inhibitor? (a) It binds to an allosteric site of the enzyme (b) It does not compete with the natural substrate for binding to the active site of the enzyme (c) Its binding to the enzyme can induce a conformational change of the enzyme (d) It can be used in combination therapies with a competitive inhibitor (e) It usually is a mimic of the natural enzyme substrate 3. What is the purpose of structure-activity-relationship (SAR) studies? (a) To identify the drug target (b) To improve the pharmacokinetic properties of the drug (c) To determine which atoms or functional groups are important to the activity of a drug (d) To simplify the synthesis of the drug (e) To optimise activity of the drug 4. Among the following five types of…arrow_forward
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