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B. Write the structures of the following peptides as they would exist at pH=7. Be sure...
Draw the peptide below (full chemical structure), as it would exist at pH=7. Indicate all bonds...
Draw the peptide below (full chemical structure), as it would exist at pH=7. Indicate all bonds (those to hydrogen are optional; you could use 'stick figures' or write methylene as CH, rather than H-C-H). You do not need to indicate stereochemistry, but make sure it is correct if you do. Val- Lys-Mer-TYR-G1v-ser Hd 2 3 equivalents of base
The chemical structures of the 20 standard amino acids at pH 7, along with their 3...
The chemical structures of the 20 standard amino acids at pH 7, along with their 3 and 1 letter codes, are givern in alphabetical order below. While the oxygen and nitrogen atoms of the peptide bonds may serve as a donor atom to complex a metal ion, very often the ligands for the metal come from the amino acid side chains. Takea few moments to examine the chemical structures of the different side chains. Circle the side chains that you...
1. Draw the structure of the following tripeptide as it would exist at physiological pH. Be...
1. Draw the structure of the following tripeptide as it would exist at physiological pH. Be sure to indicate any positive or negatively charged groups in the tripeptide. lle-Lys-Tyr
1. For each of the following structures, i. write the IUPAC name. (2 pts.) ii. classify...
1. For each of the following structures, i. write the IUPAC name. (2 pts.) ii. classify each halogen as 1º, 2º, or 3º. (1 pt.) 2. Draw structures for the following alkyl halides. Be sure to indicate any stereochemistry as needed. (2 pts. each) a. 3,6-dibromo-3,6-dichlorononane b. 2-iodo-2-methylpentane Page 3 4. Indicate which alkyl halide you would expect to react more rapidly by an S12 mechanism. (2 pts.) Explain your answer. (2 pts.) 3. i. State which reagent you would...
Q1: You have two short peptides: Peptide A) KVDFSA; Peptide B) IRGTKL a. Write the chemical...
Q1: You have two short peptides: Peptide A) KVDFSA; Peptide B) IRGTKL a. Write the chemical structure of peptide A as it would appear at pH 7. Include all charges and begin from the N-terminus b. determine the net charge on each of the peptides at pH 2, 7, and 11 c. You would now like to separate the two peptides. You decide to use a cation exchange column at pH 7 A cation exchange column is composed of negatively...
-2. Which of the following tripeptides would carry a net charge of-1 at pH 7? Markallthatapply....
-2. Which of the following tripeptides would carry a net charge of-1 at pH 7? Markallthatapply. (3 pts.) A. Asp-Ala-Arg C. Lys-Gly-Asn D. Glu-Lys-Asp E. Leu-Asp-Glu F. Arg-lleu-Cys B. Met-Pro-Glu The Kd for a dimeric protein complex is 2.2 μM. (3 pts.) Mark all that are true about this dimeric protein complex. A. 3. At equilibrium, the concentration of the individual subunits is very, very low. B. If this is a homodimer, it can be called an αβ dimer. C....
Under what condition would phenylalanine exist as follows? CH2CHCO2 NH2 A) at a low pH B)...
Under what condition would phenylalanine exist as follows? CH2CHCO2 NH2 A) at a low pH B) at a high pH C) at the pl D) when pH =pKa What is the net charge of isoleucine (any amino acid) at its isoelectric point? A) 0 B) +1 C) +2 D) -1 E) -2 The reaction of HO -CH=CHCOH NH2 tyrosine Do not overthink this. D) Br with bromine water is likely to give A) HO CH CHCE HO -CH2CCOH Br NH2...
a. Which spot corresponds to the protein with the largest molecular weight? b. When pH = 7, what order would the follow...
a. Which spot corresponds to the protein with the largest
molecular weight?
b. When pH = 7, what order would the following peptides elute
from a column filled with cation exchange resin? Size exclusion
column?
Protein 1 – 400 kDa;
10%A 5%E, 5%F, 10% G, 5% H, 10%I, 10%K, 10%L 10%R, 5%P, 5%S, 10%W,
5%Y
Protein 2: 40 kDa
5%A, 5%C, 5%D, 5%E, 5%F, 10%G, 5%I, 10%K, 5%L, 5%M, 5%N, 10%P, 5%R,
5%S, 5%T, 5%V, 5%W,
Protein 3 – 175...
b) Write the structure of the following compounds (Fischer projection): (D)-serine, (S)-methionine c) Write the structure...
b) Write the structure of the following compounds (Fischer projection): (D)-serine, (S)-methionine c) Write the structure of the following tripeptide: H-Ala-Pro-Phe-OH 2. Determine the N-terminal amino acid of the above tripeptide (H-Ala-Pro-Phe-OH) using the Sanger method (chemical equation). 3. Starting from alanine and glycine synthetize the glycyl-alanine (H-Ala-Gly-OH) dipeptide using mixed anhydride coupling method with Boc (amino) and Bn (carboxyl) protecting groups (reagents, reaction conditions, chemical equations). 4. Starting from the appropriate aldehyde synthetize alanine using the Strecker synthesis (reactions,...
Draw the peptide below (full chemical structure), as it would exist at pH=7. Indicate all bonds (those to hydrogen are optional; you could use 'stick figures' or write methylene as CH, rather than H-C-H). You do not need to indicate stereochemistry, but make sure it is correct if you do. Val- Lys-Mer-TYR-G1v-ser Hd 2 3 equivalents of base
The chemical structures of the 20 standard amino acids at pH 7, along with their 3 and 1 letter codes, are givern in alphabetical order below. While the oxygen and nitrogen atoms of the peptide bonds may serve as a donor atom to complex a metal ion, very often the ligands for the metal come from the amino acid side chains. Takea few moments to examine the chemical structures of the different side chains. Circle the side chains that you...
1. Draw the structure of the following tripeptide as it would exist at physiological pH. Be sure to indicate any positive or negatively charged groups in the tripeptide. lle-Lys-Tyr
1. For each of the following structures, i. write the IUPAC name. (2 pts.) ii. classify each halogen as 1º, 2º, or 3º. (1 pt.) 2. Draw structures for the following alkyl halides. Be sure to indicate any stereochemistry as needed. (2 pts. each) a. 3,6-dibromo-3,6-dichlorononane b. 2-iodo-2-methylpentane Page 3 4. Indicate which alkyl halide you would expect to react more rapidly by an S12 mechanism. (2 pts.) Explain your answer. (2 pts.) 3. i. State which reagent you would...
Q1: You have two short peptides: Peptide A) KVDFSA; Peptide B) IRGTKL a. Write the chemical structure of peptide A as it would appear at pH 7. Include all charges and begin from the N-terminus b. determine the net charge on each of the peptides at pH 2, 7, and 11 c. You would now like to separate the two peptides. You decide to use a cation exchange column at pH 7 A cation exchange column is composed of negatively...
-2. Which of the following tripeptides would carry a net charge of-1 at pH 7? Markallthatapply. (3 pts.) A. Asp-Ala-Arg C. Lys-Gly-Asn D. Glu-Lys-Asp E. Leu-Asp-Glu F. Arg-lleu-Cys B. Met-Pro-Glu The Kd for a dimeric protein complex is 2.2 μM. (3 pts.) Mark all that are true about this dimeric protein complex. A. 3. At equilibrium, the concentration of the individual subunits is very, very low. B. If this is a homodimer, it can be called an αβ dimer. C....
Under what condition would phenylalanine exist as follows? CH2CHCO2 NH2 A) at a low pH B) at a high pH C) at the pl D) when pH =pKa What is the net charge of isoleucine (any amino acid) at its isoelectric point? A) 0 B) +1 C) +2 D) -1 E) -2 The reaction of HO -CH=CHCOH NH2 tyrosine Do not overthink this. D) Br with bromine water is likely to give A) HO CH CHCE HO -CH2CCOH Br NH2...
a. Which spot corresponds to the protein with the largest
molecular weight?
b. When pH = 7, what order would the following peptides elute
from a column filled with cation exchange resin? Size exclusion
column?
Protein 1 – 400 kDa;
10%A 5%E, 5%F, 10% G, 5% H, 10%I, 10%K, 10%L 10%R, 5%P, 5%S, 10%W,
5%Y
Protein 2: 40 kDa
5%A, 5%C, 5%D, 5%E, 5%F, 10%G, 5%I, 10%K, 5%L, 5%M, 5%N, 10%P, 5%R,
5%S, 5%T, 5%V, 5%W,
Protein 3 – 175...
b) Write the structure of the following compounds (Fischer projection): (D)-serine, (S)-methionine c) Write the structure of the following tripeptide: H-Ala-Pro-Phe-OH 2. Determine the N-terminal amino acid of the above tripeptide (H-Ala-Pro-Phe-OH) using the Sanger method (chemical equation). 3. Starting from alanine and glycine synthetize the glycyl-alanine (H-Ala-Gly-OH) dipeptide using mixed anhydride coupling method with Boc (amino) and Bn (carboxyl) protecting groups (reagents, reaction conditions, chemical equations). 4. Starting from the appropriate aldehyde synthetize alanine using the Strecker synthesis (reactions,...
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