29. What are the steps that can convert imines to amino acids? 1. LiAlH4; Water 1. NaCN; 2. Water 1. LiAlH4; 2. Ammonia 1. NaCN; 2. Ammonia 30. Cyclohexanone reacts with NaCN to form The S-isomer The R-isomer A racemic mixture None of the above
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- Triethylenemelamine (TEM) is an antitumor agent. Its activity is due to its ability to cross-link DNA. a. Explain why it can be used only under slightly acidic conditions.b. Explain why it can cross-link DNA.According to the paper, F486 is a phenylalanine residue (i.e., an amino acid that is part of a chain that forms a protein) on SARS-CoV-2. It has an important interaction with ACE2 (best seen in Fig. 1(C) and Fig. 2(A)). Looking at this phenylalanine and the green residues surrounding it, which statement best describes the interaction that could be occurring? a) It forms a hydrogen bond with Y83. b) It forms a dipole-dipole interaction with M82. c) It forms London dispersion forces with surrounding residues. d) It encounters repulsions from surrounding residues.Leuprolide is a synthetic nonapeptide used to treat both endometriosis in women and prostate cancer in men. (a) Both C-terminal and N-terminal amino acids in leuprolide have been structurally modified. Identify the modifications. (b) One of the nine amino acids in leuprolide has d stereochemistry rather than the usual L. Which one? (c) Write the structure of leuprolide using both one- and three-letter abbreviations. (d) What charge would you expect leuprolide to have at neutral pH?
- What is the ratio of ionized:unionized amine of glycine (pKa 9.60) in a solution at pH 8.0?Show how you could us the acetamidomalonate method to prepare the followig amino acids (a)Leucine (b)TryptophanFor the hydrophobic aggregation of two Concanavalin A subunits (below), ∆S = +0.151 kcal mol-1 K-1. Which of the following will increase the amount of aggregation? (Hint: this is a bimolecular association reaction.) a) adding water b) increasing temperature c) both of the above d) neither of the above
- 25. What are the optimal pH values for imine formation? pH < 4 4 < pH < 6 8 < pH < 9 pH > 91.Show how you will usei.Modified Gabriel’s Synthsis to prepare phenylalanine in the laboratory.ii. Streckers’s Synthesis to prepare phenylalanine in the laboratory. 2. You have been given a mixture of lysine, histidine and cysteine. The isoelectric point of the amino acids are as follows:Histidine 7.64Lysine 9.74Cystenie 5.02Show how you will separate the mixture into the pure forms. State and describe any instrument that you will use to separate the components in the mixture.Esterase is an enzyme that catalyzes the hydrolysis of esters. It hydrolyzes esters of L-amino acids more rapidly than esters of d-amino acids. How can this enzyme be used to separate a racemic mixture of amino acids?
- 4(a) Suggest a test you will use to show that a given food substance contains protein.(b)Show how you will use(i)Modified Gabriel’s Synthsis(ii)Streckers’s Synthesis to prepare phenylalanine in the laboratory.27. What reaction converts the C=O bond to the C=C bond? a. Witten Reaction b. Wittig Reaction c. Winding Reaction d. Whinging Reaction 28. What reagent can reduce imines to primary amines? a. Lithium aluminiumhydride b. Phosphorous pentachloride c. Pyridinium chlorochromate d. Sodium cyanoborohydride 29. What are the steps that can convert imines to amino acids? a. 1. LiAlH₄; Water b. 1. NaCN; 2. Water c. 1. LiAlH₄; 2. Ammonia d. 1. NaCN; 2. Ammonia 30. Cyclohexanone reacts with NaCN to form a.The S-isomer b.The R-isomer c.A racemic mixture d.None of the aboveAs shown in Mechanism 29.2, the nal steps in the Edman degradation result in rearrangement of a thiazolinone to an Nphenylthiohydantoin. Draw a stepwise mechanism for this acid-catalyzed reaction.Mechanism 29.2: Edman Degradation