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What are the R/S designations of the two stereocenters of L-threonine? What are the R/S designations of the two stereocenters of L-threonine? A) 2R,3R B) 2R,3S C) 2S,3R D) 2S,3S


A) 2R,3R
B) 2R,3S
C) 2S,3R
D) 2S,3S

E) C) and D)
F) None of the above

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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 chymotropsin?

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Chymotropsin catalyzes the hydrolysis of...

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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) ​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) ​ 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) ​ 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) ​ 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) ​ 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) ​ 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) ​ 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) ​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) C) and L)
O) B) and L)

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Which of the following dipeptides is L−Ser−L−Phe?


A)
Which of the following dipeptides is L−Ser−L−Phe? A) B) C) D)
B)
Which of the following dipeptides is L−Ser−L−Phe? A) B) C) D)
C)
Which of the following dipeptides is L−Ser−L−Phe? A) B) C) D)
D)
Which of the following dipeptides is L−Ser−L−Phe? A) B) C) D)

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

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Refer to the data below to answer the following question.Amino Acid Isoelectric point Arginine 10.76 Glutamic Acid 3.22 Tryptophan 5.89 -Define isoelectric point.

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The isoelectric point is the p...

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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.

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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) A) and B)

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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. Show the steps involved in a synthesis of F−G−I using the Merrifield procedure.

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1. blured image blured image blured image "2.BOC−I + ClCH2Polymer blured image BOC−I−O−CH...

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


A) ​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) ​ 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) ​ 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) ​ 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) ​ 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) ​ 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) ​ 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) ​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) G) and J)
O) B) and K)

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Match a term from the list below to each definition. -Enzymes which catalyze the bonding together of two substrates.


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

H) C) and F)
I) A) and G)

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To what structural feature does the term "quaternary 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) A) and B)
F) A) and D)

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Refer to the data below to answer the following question.Amino Acid Isoelectric point Arginine 10.76 Glutamic Acid 3.22 Tryptophan 5.89 -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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Which of the following tripeptides is not hydrolysed by trypsin?


A) Glu−Arg−Ser
B) Arg−Glu−Thr
C) Glu−Ser−Arg
D) Lys−Ser−Arg

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

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Which of the following reagents can be used to cleave a tert-butoxycarbonyl (Boc) protecting group from a peptide?


A) H2/Pd
B) CF3CO2H
C) Na2CO3, H2O
D) LiAlH4

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

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Identify the aldehyde byproduct that results from the following reaction. Identify the aldehyde byproduct that results from the following reaction.

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An enzyme classified as a ligase would be associated with a reaction than involves the:


A) introduction of a double bond.
B) loss of water.
C) loss of carbon dioxide.
D) transfer of an amino group.
E) hydrolysis of an ester.

F) B) and D)
G) B) and E)

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


A) ​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) ​ 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) ​ 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) ​ 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) ​ 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) ​ 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) ​ 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) ​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) E) and J)
O) E) and F)

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Which of the following amino acids has a non-polar side chain?


A) histidine
B) arginine
C) glutamine
D) valine

E) C) and D)
F) B) and D)

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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 a Fischer projection of L-leucine and label the chirality center(s) as R or S.

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Draw the structure of the product of the following reaction and describe the usefulness of this type of reaction. Draw the structure of the product of the following reaction and describe the usefulness of this type of reaction.

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blured image Removal of a protecting group...

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