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Instructions: Refer to the data below to answer the following question(s). Leucine is an essential amino acid with the systematic name 2-amino-3-methylpentanoic acid. It has pKa1 = 2.36 and pKa2 = 9.60. -Refer to instructions. Leucine is described as an essential amino acid. What does this mean?

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Humans are able to synthesize only 11 of...

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Which of the following amino acids has a sulfur-containing side chain?


A) serine
B) cysteine
C) lysine
D) methionine
E) both b and d

F) C) and D)
G) D) and E)

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Instructions: Refer to the data below to answer the following question. Instructions: Refer to the data below to answer the following question. -Refer to instructions. At what pH would you carry out an electrophoresis experiment if you wanted to separate a mixture of lysine, aspartic acid and phenylalanine? Explain. -Refer to instructions. At what pH would you carry out an electrophoresis experiment if you wanted to separate a mixture of lysine, aspartic acid and phenylalanine? Explain.

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The optimum pH for the electrophoresis o...

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Instructions: Match a structure from the list below to each of the following terms. -An amino acid with a protected carboxyl group.


A) Instructions: Match a structure from the list below to each of the following terms. -An amino acid with a protected carboxyl group. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
B) Instructions: Match a structure from the list below to each of the following terms. -An amino acid with a protected carboxyl group. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu
D) Instructions: Match a structure from the list below to each of the following terms. -An amino acid with a protected carboxyl group. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
E) Instructions: Match a structure from the list below to each of the following terms. -An amino acid with a protected carboxyl group. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val
G) apoenzyme
H) Instructions: Match a structure from the list below to each of the following terms. -An amino acid with a protected carboxyl group. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
I) Instructions: Match a structure from the list below to each of the following terms. -An amino acid with a protected carboxyl group. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
J) Instructions: Match a structure from the list below to each of the following terms. -An amino acid with a protected carboxyl group. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
K) Instructions: Match a structure from the list below to each of the following terms. -An amino acid with a protected carboxyl group. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe
M) vitamins

N) C) and H)
O) A) and H)

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Instructions: Refer to the data below to answer the following question(s). Leucine is an essential amino acid with the systematic name 2-amino-3-methylpentanoic acid. It has pKa1 = 2.36 and pKa2 = 9.60. -Refer to instructions. What is the pI of leucine?

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The pI is the isoelectric point and is the average of pKa1 and pKa2. For leucine: 11eb872c_b821_b695_883a_6ff67eaeb023_TB8770_00

Instructions: Match a structure from the list below to each of the following terms. -A polypeptide which gives four fragments on treatment with chymotrypsin.


A) Instructions: Match a structure from the list below to each of the following terms. -A polypeptide which gives four fragments on treatment with chymotrypsin. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
B) Instructions: Match a structure from the list below to each of the following terms. -A polypeptide which gives four fragments on treatment with chymotrypsin. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu
D) Instructions: Match a structure from the list below to each of the following terms. -A polypeptide which gives four fragments on treatment with chymotrypsin. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
E) Instructions: Match a structure from the list below to each of the following terms. -A polypeptide which gives four fragments on treatment with chymotrypsin. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val
G) apoenzyme
H) Instructions: Match a structure from the list below to each of the following terms. -A polypeptide which gives four fragments on treatment with chymotrypsin. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
I) Instructions: Match a structure from the list below to each of the following terms. -A polypeptide which gives four fragments on treatment with chymotrypsin. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
J) Instructions: Match a structure from the list below to each of the following terms. -A polypeptide which gives four fragments on treatment with chymotrypsin. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
K) Instructions: Match a structure from the list below to each of the following terms. -A polypeptide which gives four fragments on treatment with chymotrypsin. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe
M) vitamins

N) D) and L)
O) B) and K)

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Instructions: Refer to the data below to answer the following question(s). Leucine is an essential amino acid with the systematic name 2-amino-3-methylpentanoic acid. It has pKa1 = 2.36 and pKa2 = 9.60. -Refer to instructions. Draw the condensed structure for leucine, and label all chirality centers with an asterisk and identify the amine as primary, secondary or tertiary.

Correct Answer

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Instructions: Match a structure from the list below to each of the following terms. -A peptide containing eight amino acid residues with a C-terminal valine.


A) Instructions: Match a structure from the list below to each of the following terms. -A peptide containing eight amino acid residues with a C-terminal valine. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
B) Instructions: Match a structure from the list below to each of the following terms. -A peptide containing eight amino acid residues with a C-terminal valine. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu
D) Instructions: Match a structure from the list below to each of the following terms. -A peptide containing eight amino acid residues with a C-terminal valine. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
E) Instructions: Match a structure from the list below to each of the following terms. -A peptide containing eight amino acid residues with a C-terminal valine. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val
G) apoenzyme
H) Instructions: Match a structure from the list below to each of the following terms. -A peptide containing eight amino acid residues with a C-terminal valine. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
I) Instructions: Match a structure from the list below to each of the following terms. -A peptide containing eight amino acid residues with a C-terminal valine. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
J) Instructions: Match a structure from the list below to each of the following terms. -A peptide containing eight amino acid residues with a C-terminal valine. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
K) Instructions: Match a structure from the list below to each of the following terms. -A peptide containing eight amino acid residues with a C-terminal valine. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe
M) vitamins

N) A) and E)
O) B) and C)

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Instructions: Match a structure from the list below to each of the following terms. -A peptide coupling reagent.


A) Instructions: Match a structure from the list below to each of the following terms. -A peptide coupling reagent. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
B) Instructions: Match a structure from the list below to each of the following terms. -A peptide coupling reagent. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu
D) Instructions: Match a structure from the list below to each of the following terms. -A peptide coupling reagent. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
E) Instructions: Match a structure from the list below to each of the following terms. -A peptide coupling reagent. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val
G) apoenzyme
H) Instructions: Match a structure from the list below to each of the following terms. -A peptide coupling reagent. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
I) Instructions: Match a structure from the list below to each of the following terms. -A peptide coupling reagent. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
J) Instructions: Match a structure from the list below to each of the following terms. -A peptide coupling reagent. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
K) Instructions: Match a structure from the list below to each of the following terms. -A peptide coupling reagent. A) B) C) Val-Phe-Leu-Met-Tyr-Pro-Gly-Trp-Cys-Glu D) E) F) Asp-Tyr-Ile-His-Pro-Phe-Arg-Val G) apoenzyme H) I) J) K) L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe M) vitamins
L) Val-Lys-Phe-Gly-Arg-Met-Arg-Phe
M) vitamins

N) A) and E)
O) F) and L)

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Which of the following amino acids migrates to the positive electrode on paper electrophoresis at a pH of 7.0?


A) glutamic acid
B) arginine
C) lysine
D) histadine

E) All of the above
F) A) and B)

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A

Match a term from the list below to each definition. -Enzymes which catalyze the transfer of a phosphate group.


A) Ligases
B) Fibrous proteins
C) Conjugated protein
D) Hydrolases
E) Simple protein
F) Globular proteins
G) Kinases

H) None of the above
I) C) and F)

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Which of the following amino acids is a secondary amine?


A) proline
B) glutamine
C) histidine
D) aspargine

E) B) and D)
F) All of the above

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Which of the following amino acids has an aromatic side chain?


A) isoleucine
B) valine
C) tyrosine
D) threonine

E) A) and D)
F) C) and D)

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To what structural feature does the term "secondary structure" refer?


A) the sequence of amino acids in proteins
B) the overall folding pattern of proteins
C) the aggregation of polypeptides
D) the conformation of local regions of polypeptides

E) All of the above
F) A) and D)

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Which of the following amino acids would contain the highest concentration of zwitterions at pH 5.90?


A) aspartic acid (pI 2.77)
B) alanine (pI 6.01)
C) lysine (pI 9.74)
D) glutamic acid (pI 3.22)
E) all of these contain approximately equal concentrations of zwitterions

F) A) and C)
G) A) and E)

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BOC protecting groups are generally removed by treatment with trifluoroacetic acid. BOC protecting groups are generally removed by treatment with trifluoroacetic acid. On the structures provided below, draw arrows consistent with electron flow in the mechanism of this reaction. On the structures provided below, draw arrows consistent with electron flow in the mechanism of this reaction. BOC protecting groups are generally removed by treatment with trifluoroacetic acid. On the structures provided below, draw arrows consistent with electron flow in the mechanism of this reaction.

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Instructions: Refer to the data below to answer the following question(s). Leucine is an essential amino acid with the systematic name 2-amino-3-methylpentanoic acid. It has pKa1 = 2.36 and pKa2 = 9.60. -Refer to instructions. Draw the structure of the predominant form of leucine at pH = 1.50.

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Which of the following tripeptides is not hydrolysed by chymotrypsin?


A) Phe-Lys-Glu
B) Lys-Tyr-Phe
C) Gln-Ser-Phe
D) Gln-Tyr-Ser

E) None of the above
F) A) and B)

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C

Instructions: Refer to the data below to answer the following question(s). Porcine dynorphin is a neuropeptide having 17 amino acid residues. Its structure is shown below. Tyr-Gly-Gly-Phe-Leu-Arg-Arg-Ile-Arg-Pro-Lys-Leu-Lys-Trp-Asp-Asn-Gln -Refer to instructions. What fragments would result if dynorphin were cleaved by trypsin?

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Trypsin catalyzes the hydrolysis of pept...

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Instructions: Consider the following structure. Based on this structure answer the following question(s). Instructions: Consider the following structure. Based on this structure answer the following question(s). -Refer to instructions. Identify the C-terminal amino acid and the N-terminal amino acid. -Refer to instructions. Identify the C-terminal amino acid and the N-terminal amino acid.

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