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can you please explain this answer 7. (2 pts) is the given amino acid (histidine) below...
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8. (3 pts) Consider the structure of histidine, shown below, along with the three pk, values of the three acidic groups. What is the isoelectric point (pl) for histidine? NH2 pka COOH = 1.77 = 6.10 pka, NH3+ = 9.18 pka, ning A) 3.94 C) 5.68 B) 5.48 D) 7.64 histidine OH 9. (3 pts) Which one of the following forms of histidine is the form that would mainly exist near pH = 4? HN NH2...
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If you applied an amino acid mixture containing Histidine and Lysine onto ion exchange chromatography, at what pH should the chromatography be performed? Explain your reasoning. Lysine: pKa1-2.2, pKa2-9.1 and pKaR- 10.5 Histidine: pKa1=1.8, pKa2-9.3 and pKaR-6.0
If you applied an amino acid mixture containing Histidine and Lysine onto ion exchange chromatography, at what pH should the chromatography be performed? Explain your reasoning. Lysine: pKa1-2.2, pKa2-9.1 and pKaR- 10.5 Histidine: pKa1=1.8, pKa2-9.3 and...
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он н OH 29.33 Histidine is classified as a basic amino acid because one of the N atoms in its five-membered ring is readily protonated by acid Which N atom In hiotidino is protonatod and why?
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the amino acids are :histidine- glycine-and glutamic acid
slution
1. Construct titration curves for the amino acids titrated by plotting 2. Determine the pI and the pKo values for each amino acid analyzed and 3. Identify each ionic state of the amino acid during the titration. added o acid analyzed and record the values on your titration curves 4. Determine the moles of amino acid present in each amino acid solution.
2. Histidine is an amino acid important for tissue growth and repair. Histidine is metabolized by the body to produce histamine which is released in the body in response to trauma or to an allergic reaction, causing itchy eyes, stuffy sinuses, and general discomfort - sort of like exams. It also could potentially be a chelating agent. Let's give histidine the abbreviation Hz Hist. a. Given the 3 Kg 's for histidine, write the equilibrium reaction associated with each of...
Identify the kind of chemical catalysis and then identify which of the given amino acids can act as a catalyst for the reaction. HN-C-Coo H ¢-Coo HN— _—-coo MN -COOHN- -c coo histidine glutamic acid serine methionine lysine O că-oá D D HOH glutamic acid serine lysine histidine methionine caro Сх OH , Which amino acid would catalyze the reaction? The reaction is an example of acid-base catalysis covalent catalysis O glutamic acid O serine lysine histidine O methionine metal...
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2) Imagine an enzyme that has a histidine in the substrate binding pocket that regulates substrate binding based on its protonation state to control enzyme function. Substrates can only bind in the unprotonated state; in other words, substrate binding is blocked when the histidine is protonated and when the substrate is bound, the histidine cannot be protonated. This enzyme exhibits classical Michaelis-Menten behavior. a) Assume that the pka of the histidine in...
Amino Acids SW C2 9. Which of the following is an L-amino acid? çoo coo coo HẠN |-R HANH, HẠN –H HÀNH R coo B. 10. The following questions refer to the structures A-E below: (a) Which represents the structure of an amino acid at very high pH? (b) Which is a zwitterion? (c) Which represents the structure of an amino acid at very low pH? (d) Which structure/(s) is/are) not possible? R-CH-COOR-CH-COOH R-CH-COOH R-CH-COOR -CH-COO NH2 NH2 *NH NH2...
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VI. L-glutamic acid is a diprotic a-amino acid that is involved in metabolic protein synthesis and neurotransmission. One can write this schematically as H,G where "G" is the rest of the molecule. Given the following data, answer the question posed (5 points) phs Form K Н.G Hа" 7.41E-3 4.90E-5 4309 Which system (circle one answer) would make the best buffer to maintain pHH -3.8? (0) H,G alone (iv) HG/G (ii) HG alone (ii)...
(18 pts) Answer True or False for each of the following questions (a) An amino acid is in the zwitterionic form only if the pll is well below 7 (b) Salting out takes advantage of the fact that the solubility of proteins varies with concentration. (c) Proteins usually consists of amino acids of both L-isomers (d) Essentially all a-helices found in proteins are left-handed globular protein is thermodynamically the most stable structure. ( Isoclectric focusing can be used to separate...