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Under what condition would phenylalanine exist as follows? CH2CHCO2 NH2 A) at a low pH B)...
Which one of the following represents a tetrapeptide? A) Val-Ile-Asp-Asp B) Ala-Ala-Ala-Ala-Val-Val C) Ala-Ser-Val-Val-Ile D) Ser-Ser-Ala-Ala-Gly-Gly-Glu-Glu...
Which one of the following represents a tetrapeptide? A) Val-Ile-Asp-Asp B) Ala-Ala-Ala-Ala-Val-Val C) Ala-Ser-Val-Val-Ile D) Ser-Ser-Ala-Ala-Gly-Gly-Glu-Glu E) Ser-Ala-Thr-Pro-Leu In the octapeptide, Cys-Ile-Ser-Asp-Gly-His-Gly-Gly, which is the N-terminal amino acid A) Ser B) Ile C) Asp D) Cys E) Gly If an amino acid has one carboxyl group and one amino group, and the pka's are 2.4 and 9.8 respectively, what is its isoelectric point? A) 3.7 B) 6.1 C) 7.0 D) 7.9 E) 12.2 Which of the following will migrate toward...
Based on the equilibria shown below, what is the net charge on structure IV? This is...
Based on the equilibria shown below, what is the net charge on structure IV? This is a simple problem. Do not overthink it. pk = 2.09 HOQCCH CHCO,H HOCCH CHCO3 *NH *NH II 1 15 PK = 3.86 pk = 9.82 -OCCH_CHCO3- NH2 IV FOCCH2CHCO3- *NH III A) -2 B)-1 C) 0 D) +1 E) +2 At the isoelectric point, the structure of methionine (2-amino-4-methylthiobutanoic acid) is This is a simple problem. Do not overthink it. A) D) CH SCH...
The one-letter sequence is: WATER a) Draw the peptide (R-groups trans), indicating charges, in pr...
The one-letter sequence is: WATER
a) Draw the peptide (R-groups trans), indicating charges, in
predominant form found at pH = 0.
b) What is the isoelectric point?
c) What is the average charge on the population of peptide
macromolecules at pH = 2.2?
d) What is the average charge on the population of peptide
macromolecules at pH = 12.5?
TABLE 4.1 Amino Acid Alanine Arginine Asparagine Aspartic acid Cysteine....« Glutamic acid Glutamine Glycine Histidine Isoleucine Leucine Lysine … Methionine Phenylalanine...
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...
1. Which is a true statement about amino acids? a. They are amphiprotic b. The a-carbon...
1. Which is a true statement about amino acids? a. They are amphiprotic b. The a-carbon has an ester attached c. They are symmetrical d. They are planar e. The α-carbon has a phosphate group attached 2. Which is an incorrect statement regarding the side chains of amino acids? a. Tryptophan, tyrosine, and phenylalanine contain an aromatic group. b. Isoleucine, and leucine are isomers of each other. c. Lysine and methionine contain an amine group. d. Threonine, serine, and tyrosine...
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,...
Pair the reagent condition with the reaction that corresponds. a. (Ph),Culi, eter b. NaBH, etanol c....
Pair the reagent condition with the reaction that corresponds. a. (Ph),Culi, eter b. NaBH, etanol c. 1. CH MgBreter 2. HO d. 1. LAIH, THF 2. HO e. (CH) Culi, eter 1 1. DIBAH, tolueno 2. HO 31 (PL) CHMBP 2. HO h. 1.2 PhMgBr, eter 2. HO OH O=0 1 ole colod 2 Oxu CH OH 3. -olah NHCH.CH NHCH.CH 5.
a) For most enzymes, the Km is closely related to the affinity of the enzyme for...
a) For most enzymes, the Km is closely related to the affinity of the enzyme for its substrate(s). Which has higher affinity, an enzyme with a low Km, or an enzyme with a high Km? Justify your answer. b) True or false: at a pH equal to its pKA, the average charge on an ionizable amino acid sidechain (such as lysine's ε-amino group) will be zero. c) Titration of isoleucine by a strong base, for example NaOH, reveals two pK’s....
Biochem help 2 14. What would be the net charge on the dipeptide Ser-His at pH-...
Biochem help 2
14. What would be the net charge on the dipeptide Ser-His at pH- 6.04? (Choose the one best answer.) a) 1.5 b) +1; c) +0.5 d) 0 e) -0.5; 15. The pKa of a lysine side chain in a protein ending up on the outside of a globular protein has a different pKa than if the lysine is buried within the interior of a protein. What would be the expected pKa of a side chain of lysine...
#1) For the following pentapeptide (Where pH =1): a) What would the net charge be for...
#1) For the following pentapeptide (Where pH =1):
a) What would the net charge be for the following pH?
pH 0 =
pH 3 =
pH 5 =
pH 7 =
pH 10 =
pH 13 =
b) Calculate the pl of the pentapeptide. (Cysteine: pK1 = 1.96,
pK2 = 10.128) ( Glutamine: pK1 = 2.17 , pK2 = 9.13) (Arginine: pK1
= 2.17. pK2 = 9.04) (Leucine: pK1 = 2.36 , pK2 = 9.60)
c) If you were to...
Which one of the following represents a tetrapeptide? A) Val-Ile-Asp-Asp B) Ala-Ala-Ala-Ala-Val-Val C) Ala-Ser-Val-Val-Ile D) Ser-Ser-Ala-Ala-Gly-Gly-Glu-Glu E) Ser-Ala-Thr-Pro-Leu In the octapeptide, Cys-Ile-Ser-Asp-Gly-His-Gly-Gly, which is the N-terminal amino acid A) Ser B) Ile C) Asp D) Cys E) Gly If an amino acid has one carboxyl group and one amino group, and the pka's are 2.4 and 9.8 respectively, what is its isoelectric point? A) 3.7 B) 6.1 C) 7.0 D) 7.9 E) 12.2 Which of the following will migrate toward...
Based on the equilibria shown below, what is the net charge on structure IV? This is a simple problem. Do not overthink it. pk = 2.09 HOQCCH CHCO,H HOCCH CHCO3 *NH *NH II 1 15 PK = 3.86 pk = 9.82 -OCCH_CHCO3- NH2 IV FOCCH2CHCO3- *NH III A) -2 B)-1 C) 0 D) +1 E) +2 At the isoelectric point, the structure of methionine (2-amino-4-methylthiobutanoic acid) is This is a simple problem. Do not overthink it. A) D) CH SCH...
The one-letter sequence is: WATER
a) Draw the peptide (R-groups trans), indicating charges, in
predominant form found at pH = 0.
b) What is the isoelectric point?
c) What is the average charge on the population of peptide
macromolecules at pH = 2.2?
d) What is the average charge on the population of peptide
macromolecules at pH = 12.5?
TABLE 4.1 Amino Acid Alanine Arginine Asparagine Aspartic acid Cysteine....« Glutamic acid Glutamine Glycine Histidine Isoleucine Leucine Lysine … Methionine Phenylalanine...
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...
1. Which is a true statement about amino acids? a. They are amphiprotic b. The a-carbon has an ester attached c. They are symmetrical d. They are planar e. The α-carbon has a phosphate group attached 2. Which is an incorrect statement regarding the side chains of amino acids? a. Tryptophan, tyrosine, and phenylalanine contain an aromatic group. b. Isoleucine, and leucine are isomers of each other. c. Lysine and methionine contain an amine group. d. Threonine, serine, and tyrosine...
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,...
Pair the reagent condition with the reaction that corresponds. a. (Ph),Culi, eter b. NaBH, etanol c. 1. CH MgBreter 2. HO d. 1. LAIH, THF 2. HO e. (CH) Culi, eter 1 1. DIBAH, tolueno 2. HO 31 (PL) CHMBP 2. HO h. 1.2 PhMgBr, eter 2. HO OH O=0 1 ole colod 2 Oxu CH OH 3. -olah NHCH.CH NHCH.CH 5.
Biochem help 2
14. What would be the net charge on the dipeptide Ser-His at pH- 6.04? (Choose the one best answer.) a) 1.5 b) +1; c) +0.5 d) 0 e) -0.5; 15. The pKa of a lysine side chain in a protein ending up on the outside of a globular protein has a different pKa than if the lysine is buried within the interior of a protein. What would be the expected pKa of a side chain of lysine...
#1) For the following pentapeptide (Where pH =1):
a) What would the net charge be for the following pH?
pH 0 =
pH 3 =
pH 5 =
pH 7 =
pH 10 =
pH 13 =
b) Calculate the pl of the pentapeptide. (Cysteine: pK1 = 1.96,
pK2 = 10.128) ( Glutamine: pK1 = 2.17 , pK2 = 9.13) (Arginine: pK1
= 2.17. pK2 = 9.04) (Leucine: pK1 = 2.36 , pK2 = 9.60)
c) If you were to...
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