Homework Answers
At the isoelectric point the molecule has a net charge equal to zero.
In the given question, 1st structure has charge = +1, 2nd structure has charge = +1 - 1 = 0, 3rd structure has charge = +1 - 1 - 1 = -1, 4th structure has charge = -1 -1 = -2
Hence 2nd structure is at isoelectric point.
pI is the pH at isoelectric point when the molecule has a net charge equal to zero.
pI = (pKac + pKaR ) / 2 = (2.1+3.9)/2 = 6/2 = 3
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36. Calculate the pl and identify which structure is at isoelectric point H.N -ċ-COOH pka HN...
At a pH greater than that of its isoelectric point, the structure of glycine is a)...
At a pH greater than that of its isoelectric point, the structure of glycine is a) H-CH-COOH b) H-CH-COO- c)H-CH-COOH d) H-CH-COO-e) H-CH-COO- + + - NH2 NH3 NH3 NH2 NH2
m ical reactions 8) Which of the following represents an amino acid in a basic solution...
m ical reactions 8) Which of the following represents an amino acid in a basic solution (pH-11)? A) R-CH-COOR -CH-COOH ENH2 R--CH-COOH R-CH-coo C) NH3 D) 3NH3 9) Which of the following is a zwitterion? B) NH2 R-CH-Coo E) NH2 A) R-CH-COO R-ch-cool R-ca-cooH R-ch-coo H2B) NH2C) NH3 D) NH3 R-ca-coo E) NH2 10) Which of the following amino acids has the lowest isoelectric point? A) glutamic acid B) lysine C) valine D) glycine E) methionine 11) Calculate the isoelectric...
Which of the pH conditions shown below would give this heptapeptide an overall charge of +2? COOH CH2 CH NH NH. CH5 HN...
Which of the pH conditions shown below would give this heptapeptide an overall charge of +2? COOH CH2 CH NH NH. CH5 HN CH NH,— сH,CH,CH,CH NH NH2 NH C но CH CH2 CH C СООН (a) The cyclic structure means that the system will always be isoelectronic (b) рH %3 3 (c) Neutral pH (d) pH 10 (e) The system will always be charged as it is a zwitterion = 40
Which of the pH conditions shown below would...
2) At a pH greater than that of its isoelectric point, the structure of glycine is...
2) At a pH greater than that of its isoelectric point, the structure of glycine is a) H-CH-COOH b) H-CH-C00- c) H-CH-CO e) H-CH-COO COOH b) H-CH-C00- c) H-CH-COOH d) H-CH-COO NH2 NH2 NH2 NH3 NH 3) Which of the following structures can be destroyed by the dena structures can be destroyed by the denaturation of a protein? a) Only primary and tertiary structures of a protein. b) Only secondary, tertiary y secondary, tertiary, and quaternary structures of a protein....
For alanine, the pKa(COOH)=2.3, pKa(NH3)=9.7 Select the true answers by referring to the structure of alanine,...
For alanine, the pKa(COOH)=2.3, pKa(NH3)=9.7
Select the true answers by referring to the structure of alanine,
shown above at pH= 7.0. Please note the pH at which the
titration was started.
True False Alanine has a buffer region near pH 10.
True False At point B, the net charge is +1.
True False At point B, the net charge is +0.5
True False At the isoelectric point, C, pH = 6.0
True False Alanine has a buffer region near pH 6.
True False At the isoelectric...
explain the following answers 8. (3 pts) Consider the structure of histidine, shown below, along with...
explain the following answers
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...
1. Calculate pl value of His. COO H-C-CH NH3 Histidine (His, H) 2. The R group of lysine has an amino group that can be positively charged or lose a proton to become neutral. The pKa of the amino...
1. Calculate pl value of His. COO H-C-CH NH3 Histidine (His, H) 2. The R group of lysine has an amino group that can be positively charged or lose a proton to become neutral. The pKa of the amino group is 10.8. Determine the fraction of amino group that is protonated at pH 9.8 and at pH 11.8.
1. Calculate pl value of His. COO H-C-CH NH3 Histidine (His, H) 2. The R group of lysine has an amino group...
What is the pl (isoelectric point) of the protein you chose in the previous problem? What...
What is the pl (isoelectric point) of the protein you chose in the previous problem? What is the pl of the peptide MEHR? You may find ExPASy's pl/MW calculation server (http://web.expasy.org/compute pi/) to be useful in calculating the pl of your protein, however, for the peptide, please calculate the pl by hand and show your work: you may use the pKa values on Wikipedia https://en.wikipedia.org/wiki/Proteinogenic amino acid# Chemical properties. you may need to copy and paste this link into your...
Identify the structural components of an amino acid and understand the chemical diversity of amino acids...
Identify the structural components of an amino acid and understand the chemical diversity of amino acids Question Coo- Anch H₂N-CH2 H2C CH Proline Proline's structure has a unique feature not found in other amino acids. What is it? Select the correct answer below: O Proline is chiral. O The amino group is part of the side chain. O Proline is positively charged. O Proline is achiral. P FEEDBACK MORE INSTRUCTION SUBMIT Content attribution Understand protonation and deprotonation of carboxyl and...
Question 10 (1 point) Identify the amino acid below that may be at its isoelectronic point:...
Question 10 (1 point) Identify the amino acid below that may be at its isoelectronic point: HgN* - cH-c-0' -*-Y_I_. 9 HN --cH-c-0 -- HgN+ -cH-c-0' - CH, I HN* --CH-c-0' -8_6_6_5_! +NH3| Previous Page Next Page Page 10 of 11 Question 11 (1 point) Which of the following will produce yellow products in a Xanthroproteic test? o Tyr Oval O lys Asp Previous Page Next Page Page 11 of 11 Question 9 (1 point) What happens when the pH...
At a pH greater than that of its isoelectric point, the structure of glycine is a) H-CH-COOH b) H-CH-COO- c)H-CH-COOH d) H-CH-COO-e) H-CH-COO- + + - NH2 NH3 NH3 NH2 NH2
m ical reactions 8) Which of the following represents an amino acid in a basic solution (pH-11)? A) R-CH-COOR -CH-COOH ENH2 R--CH-COOH R-CH-coo C) NH3 D) 3NH3 9) Which of the following is a zwitterion? B) NH2 R-CH-Coo E) NH2 A) R-CH-COO R-ch-cool R-ca-cooH R-ch-coo H2B) NH2C) NH3 D) NH3 R-ca-coo E) NH2 10) Which of the following amino acids has the lowest isoelectric point? A) glutamic acid B) lysine C) valine D) glycine E) methionine 11) Calculate the isoelectric...
Which of the pH conditions shown below would give this heptapeptide an overall charge of +2? COOH CH2 CH NH NH. CH5 HN CH NH,— сH,CH,CH,CH NH NH2 NH C но CH CH2 CH C СООН (a) The cyclic structure means that the system will always be isoelectronic (b) рH %3 3 (c) Neutral pH (d) pH 10 (e) The system will always be charged as it is a zwitterion = 40
Which of the pH conditions shown below would...
2) At a pH greater than that of its isoelectric point, the structure of glycine is a) H-CH-COOH b) H-CH-C00- c) H-CH-CO e) H-CH-COO COOH b) H-CH-C00- c) H-CH-COOH d) H-CH-COO NH2 NH2 NH2 NH3 NH 3) Which of the following structures can be destroyed by the dena structures can be destroyed by the denaturation of a protein? a) Only primary and tertiary structures of a protein. b) Only secondary, tertiary y secondary, tertiary, and quaternary structures of a protein....
For alanine, the pKa(COOH)=2.3, pKa(NH3)=9.7
Select the true answers by referring to the structure of alanine,
shown above at pH= 7.0. Please note the pH at which the
titration was started.
True False Alanine has a buffer region near pH 10.
True False At point B, the net charge is +1.
True False At point B, the net charge is +0.5
True False At the isoelectric point, C, pH = 6.0
True False Alanine has a buffer region near pH 6.
True False At the isoelectric...
explain the following answers
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...
1. Calculate pl value of His. COO H-C-CH NH3 Histidine (His, H) 2. The R group of lysine has an amino group that can be positively charged or lose a proton to become neutral. The pKa of the amino group is 10.8. Determine the fraction of amino group that is protonated at pH 9.8 and at pH 11.8.
1. Calculate pl value of His. COO H-C-CH NH3 Histidine (His, H) 2. The R group of lysine has an amino group...
What is the pl (isoelectric point) of the protein you chose in the previous problem? What is the pl of the peptide MEHR? You may find ExPASy's pl/MW calculation server (http://web.expasy.org/compute pi/) to be useful in calculating the pl of your protein, however, for the peptide, please calculate the pl by hand and show your work: you may use the pKa values on Wikipedia https://en.wikipedia.org/wiki/Proteinogenic amino acid# Chemical properties. you may need to copy and paste this link into your...
Identify the structural components of an amino acid and understand the chemical diversity of amino acids Question Coo- Anch H₂N-CH2 H2C CH Proline Proline's structure has a unique feature not found in other amino acids. What is it? Select the correct answer below: O Proline is chiral. O The amino group is part of the side chain. O Proline is positively charged. O Proline is achiral. P FEEDBACK MORE INSTRUCTION SUBMIT Content attribution Understand protonation and deprotonation of carboxyl and...
Question 10 (1 point) Identify the amino acid below that may be at its isoelectronic point: HgN* - cH-c-0' -*-Y_I_. 9 HN --cH-c-0 -- HgN+ -cH-c-0' - CH, I HN* --CH-c-0' -8_6_6_5_! +NH3| Previous Page Next Page Page 10 of 11 Question 11 (1 point) Which of the following will produce yellow products in a Xanthroproteic test? o Tyr Oval O lys Asp Previous Page Next Page Page 11 of 11 Question 9 (1 point) What happens when the pH...
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