Question 1

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

Accepted Answer

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

Question 2

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

Accepted Answer

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 
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

Question 3

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

Accepted Answer

The answer of Show the steps involved in a synthesis...

Question 4

Refer to the data below to answer the following questions:

The octapeptide saralasin is a specific antagonist of angiotensin II.  A derivative of saralasin is used therapeutically as an antihypertensive.  Amino acid analysis of saralasin show the presence of the following amino acids:

Ala, Arg, His, Pro, Sar, Tyr, ValS1U1B12S1U1B0

-Refer to instructions. Sar is the mnemonic for sarcosine, N-methyl aminoethanoic acid. Draw the structure of sarcosine.

Accepted Answer

The answer of Refer to the data below to answer...

Question 5

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 = 10.00.

Accepted Answer

The answer of Instructions: Refer to the data below to...

Question 6

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

Accepted Answer

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

Question 7

What are the R/S designations of the two stereocenters of L-threonine?

Accepted Answer

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

Question 8

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

Accepted Answer

A)  lysine 
B)  aspartic acid 
C)  asparagine 
D)  glutamic acid 
A)  lysine 
B)  aspartic acid 
C)  asparagine 
D)  glutamic acid

Question 9

Refer to the data below to answer the following questions:

The octapeptide saralasin is a specific antagonist of angiotensin II.  A derivative of saralasin is used therapeutically as an antihypertensive.  Amino acid analysis of saralasin show the presence of the following amino acids:

Ala, Arg, His, Pro, Sar, Tyr, ValS1U1B12S1U1B0

-Refer to instructions. Partial hydrolysis of saralasin with dilute hydrochloric acid yields the following fragments:
Tyr-Val-His
Sar-Arg-Val
His-Pro-Ala
Val-Tyr-Val
Arg-Val-Tyr
What is the structure of saralasin?

Accepted Answer

@#IMG-DLM&
The complete sequen

Question 10

Match a term from the list below to each definition.

-Proteins which are tough and insoluble in water.

Accepted Answer

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

Question 11

Instructions: Refer to the data below to answer the following question.
 
-Refer to instructions. The most basic amino acid is __________.

Accepted Answer

The answer of Instructions: Refer to the data below to...

Question 12

Instructions: Match a structure from the list below to each of the following terms.

-The product of an Edman degradation.

Accepted Answer

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 
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

Question 13

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

Accepted Answer

The answer of Instructions: Refer to the data below to...

Question 14

Instructions: Consider the following structure. Based on this structure answer the following question(s).  
-Refer to instructions. Name the peptide using both the three-letter and one-letter codes.

Accepted Answer

The answer of Instructions: Consider the following structure. Based on...

Question 15

Instructions: Match a structure from the list below to each of the following terms.

-Source from which many coenzymes are derived.

Accepted Answer

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 
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

Question 16

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. How many possible stereoisomers of leucine are there?

Accepted Answer

Since leucine has on

Question 17

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

Accepted Answer

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. 
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.

Question 18

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 chymotropsin?

Accepted Answer

Chymotropsin catalyzes the hydrolysis of

Question 19

Instructions: Consider the following structure. Based on this structure answer the following question(s).  
-Refer to instructions. Circle the peptide bonds.

Accepted Answer

The answer of Instructions: Consider the following structure. Based on...

Question 20

Instructions: Match a structure from the list below to each of the following terms.

-An amino acid in its zwitterionic form.

Accepted Answer

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 
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

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

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

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

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 = 10.00.

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

What are the R/S designations of the two stereocenters of L-threonine?

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

Match a term from the list below to each definition. -Proteins which are tough and insoluble in water.

Instructions: Refer to the data below to answer the following question. -Refer to instructions. The most basic amino acid is __________.

Instructions: Match a structure from the list below to each of the following terms. -The product of an Edman degradation.

Instructions: Consider the following structure. Based on this structure answer the following question(s). -Refer to instructions. Name the peptide using both the three-letter and one-letter codes.

Instructions: Match a structure from the list below to each of the following terms. -Source from which many coenzymes are derived.

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. How many possible stereoisomers of leucine are there?

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

Instructions: Consider the following structure. Based on this structure answer the following question(s). -Refer to instructions. Circle the peptide bonds.

Instructions: Match a structure from the list below to each of the following terms. -An amino acid in its zwitterionic form.

Structure and Bonding:acids and Bases

Alkanes: the Nature of Organic Compounds

Alkenes and Alkynes: the Nature of Organic Reactions

Reactions of Alkenes and Alkynes

Aromatic Compounds

Sterechemistry at Tetrahedral Centers

Organohalides: Nucleophilic Substitutions and Eliminations

Alcohols, Phenols, Ethers, and Their Sulfur Analogs

Aldehydes and Ketones: Nucleophilic Addition Reactions

Carboxylic Acids and Derivatives: Nucleophilic Acyl Substitution Reactions

Carbonyl Alpha-Substitution Reactions and Condensation Reactions

Amines

Structure Determination

Biomolecules: Carbohydrates

Biomolecules: Lipids and Nucleic Acids

The Organic Chemistry of Metabolic Pathways

Filters

Exam 15: Biomolecules: Amino Acids, Peptides, and Proteins

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

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

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

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 = 10.00.

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

What are the R/S designations of the two stereocenters of L-threonine?

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

Match a term from the list below to each definition. -Proteins which are tough and insoluble in water.

Instructions: Refer to the data below to answer the following question. -Refer to instructions. The most basic amino acid is __________.

Instructions: Match a structure from the list below to each of the following terms. -The product of an Edman degradation.

Instructions: Consider the following structure. Based on this structure answer the following question(s). -Refer to instructions. Name the peptide using both the three-letter and one-letter codes.

Instructions: Match a structure from the list below to each of the following terms. -Source from which many coenzymes are derived.

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. How many possible stereoisomers of leucine are there?

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

Instructions: Consider the following structure. Based on this structure answer the following question(s). -Refer to instructions. Circle the peptide bonds.

Instructions: Match a structure from the list below to each of the following terms. -An amino acid in its zwitterionic form.

Structure and Bonding:acids and Bases

Alkanes: the Nature of Organic Compounds

Alkenes and Alkynes: the Nature of Organic Reactions

Reactions of Alkenes and Alkynes

Aromatic Compounds

Sterechemistry at Tetrahedral Centers

Organohalides: Nucleophilic Substitutions and Eliminations

Alcohols, Phenols, Ethers, and Their Sulfur Analogs

Aldehydes and Ketones: Nucleophilic Addition Reactions

Carboxylic Acids and Derivatives: Nucleophilic Acyl Substitution Reactions

Carbonyl Alpha-Substitution Reactions and Condensation Reactions

Amines

Structure Determination

Biomolecules: Carbohydrates

Biomolecules: Lipids and Nucleic Acids

The Organic Chemistry of Metabolic Pathways

Filters