Homework Answers
(A) Chemical Structure is given below
(B)pI is that pH at which concentration of zwitterion is maximum
pI = pKa1+pKa2 / 2
pI = 2.36 + 9.6 / 2 = 5.98
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Question 1 (10pts): The amino acid leucine (shown at right) has a Pkal = 2.36 and Pka2 = 9.60. A) Draw the chemical...
show all steps please Question 1 (10pts): The amino acid leucine (shown at right) has a...
show all steps please
Question 1 (10pts): The amino acid leucine (shown at right) has a Pkai= 2.36 and Pk2 = 9.60. A) Draw the chemical form of leucine as a positive ion, as a negative ion, and as a zwitterion. B) Calculate the isoelectric point of leucine. OH NH2
1. The pKa's of the amino acid methionine are 2.28 and 9.21. The zwitterion of methionine...
1. The pKa's of the amino acid methionine are 2.28 and 9.21. The zwitterion of methionine is given below (1). S Н,с NH3 (a) Explain why structure (I) is an intermediate ion. Write balanced chemical reactions to support your reasoning (b) Draw the conjugate acid AND conjugate base form of the amino acid shown above (c) A 15-mL aliquot solution consisted 0.25M of the zwitterion of methionine and 0.30M of its conjugate acid was titrated with 0.15M NaOH, calculate the...
1. The pKa's of the amino acid methionine are 2.28 and 9.21. The zwitterion of methionine is given below (I) S H3C...
1. The pKa's of the amino acid methionine are 2.28 and 9.21. The zwitterion of methionine is given below (I) S H3C O NH3 (a) Explain why structure (I) is an intermediate ion. Write balanced chemical reactions to support your reasoning. (b) Draw the conjugate acid AND conjugate base form of the amino acid shown above (c) A 15-mL aliquot solution consisted 0.25M of the zwitterion of methionine and 0.30M of its conjugate acid was titrated with 0.15M N2OH, calculate...
Model 1 for reference, draw the structure of the given amino acid as it nly exist under each of t...
Model 1 for reference, draw the structure of the given amino acid as it nly exist under each of the following conditions for 1g.using Table 1 in a. valine; in the stomach at PH 1.5 Serine; in the small intestine at pH 10 c. Glutamate; in the blood plasma at pH 7.4 Information: Isoelectric points As shown in Model 3, amino acids do not normally exist in unionized forms. When an aminc acd contains both a (+) and a ()...
PRELAB ASSIGNMENT 1 Draw the structure of the amino acid son CH-OH Label the alpha carbon...
PRELAB ASSIGNMENT 1 Draw the structure of the amino acid son CH-OH Label the alpha carbon acid Sorine (en) which has R MO CHE OH CH2 OH 2. Draw the dipeptide that forms betw the peptide bond. s between serine and alanine The dipeptide sequence is Ser Ala Lace CH NCH H, A - — сH — с CH2 OH 3. How many amino aci arty amino acid residues are in a polypeptide containing 6 peptide bonos How many peptide...
no acid has the form shown at Team R CH ΝΗ, A) a pH of 7.0....
no acid has the form shown at Team R CH ΝΗ, A) a pH of 7.0. B) any pH other than 7.0. C) a pH greater than its isoelectric point. D) its isoelectric point. E) a pH less than its isoelectric point. 18. The N-terminal amino acid in the peptide ala-leu-gly-his-pro is A) Alanine. B) Leucine. C) Glycine. D) Histidine. E) Proline. 19. How many different tripeptides can be formed from one molecule each of the amino acids tyrosine, valine,...
Question B1 The zwitterionic structure for the amino acid phenylalanine is shown below (pKai = 2.0,...
Question B1 The zwitterionic structure for the amino acid phenylalanine is shown below (pKai = 2.0, pka2 = 8.8). + NH3 phenylalanine (a) On the graph below, draw an accurate speciation diagram for this amino acid over the pH range from 1-12. [4 marks] fraction mole 1.0 2.0 3.0 4.0 5.0 8.0 9.0 10.0 11.0 12.0 6.0 7.0 pH (b) Draw accurate chemical structures below (showing correct formal charges) for the forms of phenylalanine that are dominant at each pH....
1. What amino acids do the following abbreviations stand for? Draw the structure of each. a)...
1. What amino acids do the following abbreviations stand for? Draw the structure of each. a) lle b) Thr c) Gin 2. Name and draw the structures of the amino acids that fit these descriptions: a) Contains an isopropyl group b) Contains a secondary alcohol group 3. Which of the following objects is chiral? a) A pair of scissors b) A comb c) A drinking glass 4. What does the term achiral mean? Give two examples involving organic structures.. 5....
5. D-sorbital is found in 'sugar-free' chewing gum. It is formed by reducing D-glucose with NaBH Draw the structure of D-sorbital. s. (4 pts) Classify the following amino acid as polar, n...
5. D-sorbital is found in 'sugar-free' chewing gum. It is formed by reducing D-glucose with NaBH Draw the structure of D-sorbital. s. (4 pts) Classify the following amino acid as polar, non- polar, acidic, or basic: 6 (4 pts) The amino acid threonine (thr) has two chiral carbons. Draw a Fischer projection of the 2S,3S configuration of threonine. キ 7.(11 pts) Draw the tripeptide lys-asp-ser at physiological pH 8. (8 pts) The pK, values for aspartic acid are 2.10, 9.82...
1. a. The large structure shown below has recently been studied by the pharmaceutical company Merck....
1. a. The large structure shown below has recently been studied by the pharmaceutical company Merck. Using the numbering system shown for this structure, write (R) or (S) over the numbered line for each stereogenic center. b. (-)-Menthol is shown as the most stable chair conformation. Write the (R) or (S) stereochemistry above the atom numbers. c. Isoleucine is one of the twenty common amino acids. All of the stereogenic centers are (S). Draw the hydrogens to show those stereocenters....
show all steps please
Question 1 (10pts): The amino acid leucine (shown at right) has a Pkai= 2.36 and Pk2 = 9.60. A) Draw the chemical form of leucine as a positive ion, as a negative ion, and as a zwitterion. B) Calculate the isoelectric point of leucine. OH NH2
1. The pKa's of the amino acid methionine are 2.28 and 9.21. The zwitterion of methionine is given below (1). S Н,с NH3 (a) Explain why structure (I) is an intermediate ion. Write balanced chemical reactions to support your reasoning (b) Draw the conjugate acid AND conjugate base form of the amino acid shown above (c) A 15-mL aliquot solution consisted 0.25M of the zwitterion of methionine and 0.30M of its conjugate acid was titrated with 0.15M NaOH, calculate the...
1. The pKa's of the amino acid methionine are 2.28 and 9.21. The zwitterion of methionine is given below (I) S H3C O NH3 (a) Explain why structure (I) is an intermediate ion. Write balanced chemical reactions to support your reasoning. (b) Draw the conjugate acid AND conjugate base form of the amino acid shown above (c) A 15-mL aliquot solution consisted 0.25M of the zwitterion of methionine and 0.30M of its conjugate acid was titrated with 0.15M N2OH, calculate...
Model 1 for reference, draw the structure of the given amino acid as it nly exist under each of the following conditions for 1g.using Table 1 in a. valine; in the stomach at PH 1.5 Serine; in the small intestine at pH 10 c. Glutamate; in the blood plasma at pH 7.4 Information: Isoelectric points As shown in Model 3, amino acids do not normally exist in unionized forms. When an aminc acd contains both a (+) and a ()...
PRELAB ASSIGNMENT 1 Draw the structure of the amino acid son CH-OH Label the alpha carbon acid Sorine (en) which has R MO CHE OH CH2 OH 2. Draw the dipeptide that forms betw the peptide bond. s between serine and alanine The dipeptide sequence is Ser Ala Lace CH NCH H, A - — сH — с CH2 OH 3. How many amino aci arty amino acid residues are in a polypeptide containing 6 peptide bonos How many peptide...
no acid has the form shown at Team R CH ΝΗ, A) a pH of 7.0. B) any pH other than 7.0. C) a pH greater than its isoelectric point. D) its isoelectric point. E) a pH less than its isoelectric point. 18. The N-terminal amino acid in the peptide ala-leu-gly-his-pro is A) Alanine. B) Leucine. C) Glycine. D) Histidine. E) Proline. 19. How many different tripeptides can be formed from one molecule each of the amino acids tyrosine, valine,...
Question B1 The zwitterionic structure for the amino acid phenylalanine is shown below (pKai = 2.0, pka2 = 8.8). + NH3 phenylalanine (a) On the graph below, draw an accurate speciation diagram for this amino acid over the pH range from 1-12. [4 marks] fraction mole 1.0 2.0 3.0 4.0 5.0 8.0 9.0 10.0 11.0 12.0 6.0 7.0 pH (b) Draw accurate chemical structures below (showing correct formal charges) for the forms of phenylalanine that are dominant at each pH....
1. What amino acids do the following abbreviations stand for? Draw the structure of each. a) lle b) Thr c) Gin 2. Name and draw the structures of the amino acids that fit these descriptions: a) Contains an isopropyl group b) Contains a secondary alcohol group 3. Which of the following objects is chiral? a) A pair of scissors b) A comb c) A drinking glass 4. What does the term achiral mean? Give two examples involving organic structures.. 5....
5. D-sorbital is found in 'sugar-free' chewing gum. It is formed by reducing D-glucose with NaBH Draw the structure of D-sorbital. s. (4 pts) Classify the following amino acid as polar, non- polar, acidic, or basic: 6 (4 pts) The amino acid threonine (thr) has two chiral carbons. Draw a Fischer projection of the 2S,3S configuration of threonine. キ 7.(11 pts) Draw the tripeptide lys-asp-ser at physiological pH 8. (8 pts) The pK, values for aspartic acid are 2.10, 9.82...
1. a. The large structure shown below has recently been studied by the pharmaceutical company Merck. Using the numbering system shown for this structure, write (R) or (S) over the numbered line for each stereogenic center. b. (-)-Menthol is shown as the most stable chair conformation. Write the (R) or (S) stereochemistry above the atom numbers. c. Isoleucine is one of the twenty common amino acids. All of the stereogenic centers are (S). Draw the hydrogens to show those stereocenters....
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