Homework Answers
Isoelectronic point = 1/2 * (pKa1 + pKa2)
= 1/2 * (4.79 + 10.20)
= 1/2 * 14.99
= 7.50
Answer: 7.50
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A student performed a titration of an unknown amino acid that had two ionizable groups. The...
What is isoelectric point? The amino acid glycine has two ionizable groups: 1) a carboxyl acid...
What is isoelectric point? The amino acid glycine has two ionizable groups: 1) a carboxyl acid group with a pKa of 2.72 and 2) an amino group with a pKa of 9.60. Calculate the pI of glycine.
Look up the exact pKa's of the two ionizable groups for the amino acid methionine. a)...
Look up the exact pKa's of the two ionizable groups for the amino acid methionine. a) fill out a table that gives the charge on each ionizable group and the overall charge on the amino acid for eacu whole pH unit from 0 to 12 b) calculate the isoelectric point of met exactly c) compare your calculated pI from (c) with your table. d) draw the structure of the amino acid at pH 0, 7.4, and 12.
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Why do the pKa values of ionizable groups differ between free amino acids and amino acid residues in polypeptides? thanks
Based upon how the titration of the amino acid was performed, and the data that you...
Based upon how the titration of the amino acid was performed, and the data that you collected from the titration, calculate the concentration of the amino acid that was titrated. NOTE: you cannot base your calculation upon the assumption that the amino acids were fully protonated at the start of the titration. When you calculate the volume of titrant used you cannot start at 0.0mL. This is because the amino acids solutions are prepared by the addition of concentrated HCl...
Font 9 11.74 10 11.76 Titration of Unknown Amino Acid 32 35 36 10 40 41...
Font 9 11.74 10 11.76 Titration of Unknown Amino Acid 32 35 36 10 40 41 50 51 53 13 -12 11 10 9 76 5 3 2 1 0 12 34s s 78910 Ha Titrant Added (mL) NaOH → → 57 61 oul glapn, estmate the pKa values of the ionizing groups and the pl of the amino acid. Compare your experimental values with those found in the literature. You can, for example, use either the Handbook of Biochemistry...
< Question 17 of 27 > The graphs show a titration curve for the amino acid...
< Question 17 of 27 > The graphs show a titration curve for the amino acid histidine. Label the fist curve with the major histidine species at each position. One histidine species will not be used. Label the second curve with the pK, values for the histidine functional groups and the isoelectric point (pl) of histidine. Answer Bank [Hisºj - [His") [ His* 1 - (His 15 20 25 30 IOH equivalents)
Explain why amino acid functional groups that participate in acid-base chemistry have perturbed pKa values from sim...
Explain why amino acid functional groups that participate in acid-base chemistry have perturbed pKa values from simple methyl substituted amino and carboxyl groups. (3 points)
Explain why amino acid functional groups that participate in acid-base chemistry have perturbed pKa values from simple methyl substituted amino and carboxyl groups. (3 points)
Lecture 3 Identify amino-/carboxy termini, and R-group on amino acid What is chirality? Identify a carbon...
Lecture 3 Identify amino-/carboxy termini, and R-group on amino acid What is chirality? Identify a carbon that is chiral (i.e., has 4 different groups attached) Chiral compounds rotate plane polarized light Memorize amino acid 1) structure, 2) classification (hydrophobic, aliphatic, aromatic, negatively charged, positively charged, polar uncharged) Be able to draw glycine (the generic amino acid) Given an amino acid structure and pKas of ionizable groups, be able to determine the charge at pH 1, pH 14, and pH 7...
What about the pKa values of the R groups of the seven amino acids containing an...
What about the pKa values of the R groups of the seven amino acids containing an ionizable R group? Tyr 10.5 Lys 10.5 Arg 12.5 Asp 3.9 Glu 4.1 His 6.0 Cys 8.4 Indicate the approximate net charge of each of these seven R groups at pH 7.4. Indicate the approximate net charge of each of these seven amino acids at pH 7.4. Note: remember the carboxyl and the alpha-amino group in addition to the ionizable (acidic or basic) R...
5. Amino acid titration. The graph below shows a titration of an amino acid with NaOH....
5. Amino acid titration. The graph below shows a titration of an amino acid with NaOH. This experiment reveals several important features of this amino acid. A) What is the identity of the amino acid? [Write its full name.] B) Match the following points in the titration curve. [In the space beside each description (left), write a number (1-6) corresponding to a specific pH (right).] The amino acid is fully protonated. 1) pH=0.0 PH The amino acid is fully deprotonated....
Font 9 11.74 10 11.76 Titration of Unknown Amino Acid 32 35 36 10 40 41 50 51 53 13 -12 11 10 9 76 5 3 2 1 0 12 34s s 78910 Ha Titrant Added (mL) NaOH → → 57 61 oul glapn, estmate the pKa values of the ionizing groups and the pl of the amino acid. Compare your experimental values with those found in the literature. You can, for example, use either the Handbook of Biochemistry...
< Question 17 of 27 > The graphs show a titration curve for the amino acid histidine. Label the fist curve with the major histidine species at each position. One histidine species will not be used. Label the second curve with the pK, values for the histidine functional groups and the isoelectric point (pl) of histidine. Answer Bank [Hisºj - [His") [ His* 1 - (His 15 20 25 30 IOH equivalents)
Explain why amino acid functional groups that participate in acid-base chemistry have perturbed pKa values from simple methyl substituted amino and carboxyl groups. (3 points)
Explain why amino acid functional groups that participate in acid-base chemistry have perturbed pKa values from simple methyl substituted amino and carboxyl groups. (3 points)
Lecture 3 Identify amino-/carboxy termini, and R-group on amino acid What is chirality? Identify a carbon that is chiral (i.e., has 4 different groups attached) Chiral compounds rotate plane polarized light Memorize amino acid 1) structure, 2) classification (hydrophobic, aliphatic, aromatic, negatively charged, positively charged, polar uncharged) Be able to draw glycine (the generic amino acid) Given an amino acid structure and pKas of ionizable groups, be able to determine the charge at pH 1, pH 14, and pH 7...
5. Amino acid titration. The graph below shows a titration of an amino acid with NaOH. This experiment reveals several important features of this amino acid. A) What is the identity of the amino acid? [Write its full name.] B) Match the following points in the titration curve. [In the space beside each description (left), write a number (1-6) corresponding to a specific pH (right).] The amino acid is fully protonated. 1) pH=0.0 PH The amino acid is fully deprotonated....
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