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Which of the following is the correct structure for alanine at pH = 7? Which of the following is the correct structure for alanine at pH = 7? A) A B) B C) C D) D


A) A
B) B
C) C
D) D

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

Correct Answer

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What are the basic steps in the Merrifield peptide synthesis?


A) Coupling and hydrolysis
B) Hydrolysis and deprotection
C) Deprotection and hydrogenation
D) Coupling and deprotection

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

Correct Answer

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What is the separation of a racemic mixture into its component enantiomers called?


A) Diastereomers
B) Meso
C) Resolution
D) Neutralization

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

Correct Answer

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Which is the correct structure for serine? Which is the correct structure for serine? A) A B) B C) C D) D


A) A
B) B
C) C
D) D

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

Correct Answer

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Amino acid synthesis is possible by all except one of the pathways listed.Which is not a synthetic pathway for amino acids?


A) Amination of malonic ester followed by hydrolysis and decarboxylation
B) Nucleophilic addition of NH3 to an aldehyde followed by addition of cyanide to the imine,and,finally,hydrolysis
C) SN2 reaction using an a-halo carboxylic acid with ammonia as the nucleophile
D) Reaction of NH4Cl and NaCN with an aldehyde followed by an acidic work-up

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

Correct Answer

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Which of the following is the structure of the amino acid lysine? Which of the following is the structure of the amino acid lysine? A) A B) B C) C D) D


A) A
B) B
C) C
D) D

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

Correct Answer

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Why does the formation of salts of a racemic mixture of N-acetyl valine with a single enantiomer of a-methylbenzylamine enable the separation of the two enantiomers of N-acetyl valine?


A) They form amides.
B) They form diastereomers.
C) They form salts.
D) They form meso compounds.

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

Correct Answer

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What is formed by the combination of four amino acids?


A) A protein
B) A polypeptide
C) A tripeptide
D) A tetrapeptide

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

Correct Answer

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Why can glycine not be resolved into two enantiomers?


A) It has no stereogenic centers.
B) It has no nitrogen atoms.
C) It has no aromatic rings.
D) It cannot be converted into a salt.

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

Correct Answer

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Which of the following is the correct structure for aspartic acid at pH = 1? Which of the following is the correct structure for aspartic acid at pH = 1? A) A B) B C) C D) D


A) A
B) B
C) C
D) D

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

Correct Answer

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What is (are) the missing reagent(s) in the reaction below? What is (are) the missing reagent(s) in the reaction below? A) NH<sub>3</sub> B) HCN C) NaCN,NH<sub>4</sub>Cl D) NaNH<sub>2</sub>


A) NH3
B) HCN
C) NaCN,NH4Cl
D) NaNH2

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

Correct Answer

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What is the IUPAC or common name for the following compound? What is the IUPAC or common name for the following compound? A) Cysteinylalanine B) Alanylcysteine C) Serinylalanine D) Alanylserine


A) Cysteinylalanine
B) Alanylcysteine
C) Serinylalanine
D) Alanylserine

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

Correct Answer

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Reaction of a polypeptide,composed of 12 amino acids,with carboxypeptidase A releases Met (C-terminal amino acid) .The polypeptide undergoes partial hydrolysis to give 12 groups of peptides.Use the groups of overlapping amino acids to determine the proper sequence of this polypeptide.Note: Since these lists of peptides are separated by commas,they are not necessarily in the proper sequence. Ser,Lys,Trp-5.Met,Ala,Gly- 9.Lys,Ser Gly,His,Ala-6.Ser,Lys,Val -10.Glu,His,Val Glu,Val,Ser-7.Glu,His-11.Trp,Leu,Glu Leu,Glu,Ser-8.Leu,Lys,Trp-12.Ala,Met


A) Met-Ala-Gly-His-Glu-Val-Ser-Lys-Trp-Leu-Glu-Ser
B) Met-Ala-Gly-Glu-His-Ser-Val-Lys-Trp-Leu-Glu-Ser
C) Ser-Glu-Leu-Trp-Lys-Ser-Val-Glu-His-Gly-Ala-Met
D) Ser-Lys-Leu-Trp-Lys-Ser-Val-His-Glu-Gly-Ala-Met

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

Correct Answer

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What is the appropriate sequence of reaction conditions used to synthesize valine from acetamidomalonic ester? What is the appropriate sequence of reaction conditions used to synthesize valine from acetamidomalonic ester? A) (1) NaOH; (2) (CH<sub>3</sub>) <sub>2</sub>CHBr; (3) Cl<sub>2</sub>,H<sub>2</sub>O,heat B) (1) NaOCH<sub>2</sub>CH<sub>3</sub>; (2) (CH<sub>3</sub>) <sub>2</sub>CH<sub>2</sub>CHBr; (3) HCl,H<sub>2</sub>O,heat C) (1) NaOCH<sub>2</sub>CH<sub>3</sub>; (2) (CH<sub>3</sub>) <sub>2</sub>CHBr; (3) HCl,H<sub>2</sub>O,heat D) (1) NaOH; (2) CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>Br; (3) HCl,H<sub>2</sub>O,heat


A) (1) NaOH; (2) (CH3) 2CHBr; (3) Cl2,H2O,heat
B) (1) NaOCH2CH3; (2) (CH3) 2CH2CHBr; (3) HCl,H2O,heat
C) (1) NaOCH2CH3; (2) (CH3) 2CHBr; (3) HCl,H2O,heat
D) (1) NaOH; (2) CH3CH2CH2Br; (3) HCl,H2O,heat

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

Correct Answer

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What is the name given to the pH at which the concentration of the zwitterionic form of an amino acid is at a maximum concentration?


A) Electric point
B) Dipolar point
C) Neutral point
D) Isoelectric point

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

Correct Answer

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What are the only covalent bonds that stabilize the tertiary structure of a peptide?


A) Hydrogen bonds
B) Disulfide bonds
C) Van der Waal bonds
D) Ionic bonds

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

Correct Answer

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Which of the following correctly describes a protein?


A) a dipeptide; two amino acids joined together by one amide bond
B) a tripeptide; three amino acids joined together by two amide bonds
C) a polymer of more than 40 amino acids joined together by amide bonds
D) a polypeptide of any number of amino acids joined together by amide bonds

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

Correct Answer

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Which is the correct structure for the amino acid cysteine? Which is the correct structure for the amino acid cysteine? A) A B) B C) C D) D


A) A
B) B
C) C
D) D

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

Correct Answer

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What amino acid is at the N-terminus of the following peptide? What amino acid is at the N-terminus of the following peptide? A) Valine B) Serine C) Alanine D) Proline


A) Valine
B) Serine
C) Alanine
D) Proline

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

Correct Answer

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Which one of the following naturally occurring amino acids does not have an S configuration?


A) Cysteine
B) Alanine
C) Tyrosine
D) Isoleucine

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

Correct Answer

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