Question 1

Valylalanine and alanylvaline are constitutional isomers.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following natural amino acids is an R-isomer?

Accepted Answer

A) cysteine 
B) serine 
C) valine 
D) phenylalanine 
A) cysteine 
B) serine 
C) valine 
D) phenylalanine

Question 3

To what structural feature does the term "tertiary 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 4

Which of the following amino acids has a basic side chain?

Accepted Answer

A) lysine 
B) serine 
C) leucine 
D) tyrosine 
A) lysine 
B) serine 
C) leucine 
D) tyrosine

Question 5

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

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 6

What is the isoelectric point of glutamic acid (pKa of $\alpha$-CO2H, 2.10; pKa of $\beta$-CO2H, 4.07; pH of $\alpha$-NH2, 9.47)?

Accepted Answer

A) 3.08 
B) 5.67 
C) 6.16 
D) 17.28 
A) 3.08 
B) 5.67 
C) 6.16 
D) 17.28

Question 7

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

Accepted Answer

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

Question 8

MATCH a structure from the list below to each of the following terms. Place the letter of the structure in the blank to the left of the term which it describes.
-_____ is a carboxyl-protected amino acid.

Accepted Answer

A)   
B)   
C)   
D)   
E)  
F) 
G)BOC group
H) 
I) 
J) 
K) 
L) 
M)Z group 
A)   
B)   
C)   
D)   
E)  
F) 
G)BOC group
H) 
I) 
J) 
K) 
L) 
M)Z group

Question 9

Which of the following amino acids is a secondary amine?

Accepted Answer

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

Question 10

Which of the following is a definition of the isoelectric point of an amino acid?

Accepted Answer

A) The pH at which an amino acid has no net charge 
B) The pH at which the $\alpha$-NH2 group is completely protonated 
C) The melting point of an amino acid 
D) The conductivity of a 1 M solution of an amino acid in water 
A) The pH at which an amino acid has no net charge 
B) The pH at which the $\alpha$-NH2 group is completely protonated 
C) The melting point of an amino acid 
D) The conductivity of a 1 M solution of an amino acid in water

Valylalanine and alanylvaline are constitutional isomers.

Which of the following natural amino acids is an R-isomer?

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

Which of the following amino acids has a basic side chain?

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

What is the isoelectric point of glutamic acid (pK_a of $\alpha$ -CO₂H, 2.10; pK_a of $\beta$ -CO₂H, 4.07; pH of $\alpha$ -NH₂, 9.47)?

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

MATCH a structure from the list below to each of the following terms. Place the letter of the structure in the blank to the left of the term which it describes. -_____ is a carboxyl-protected amino acid.

Which of the following amino acids is a secondary amine?

Which of the following is a definition of the isoelectric point of an amino acid?

Covalent Bonding and Shapes of Molecules

Alkanes and Cycloalkanes

Stereoisomerism and Chirality

Acids and Bases

Alkenes: Bonding, Nomenclature, and Properties

Reactions of Alkenes

Alkynes

Haloalkanes, Halogenation, and Radical Reactions

Nucleophilic Substitution and Beta-Elimination

Alcohols

Ethers, Epoxides, and Sulfides

Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Mass Spectrometry

An Introduction to Organometallic Compounds

Aldehydes and Ketones

Carboxylic Acids

Functional Derivatives of Carboxylic Acids

Enolate Anions and Enamines

Dienes, Conjugated Systems, and Pericyclic Reactions

Benzene and the Concept of Aromaticity

Reactions of Benzene and Its Derivatives

Amines

Catalytic Carbon-Carbon Bond Formation

Carbohydrates

Lipids

Nucleic Acids

Organic Polymer Chemistry

Filters

Exam 27: Amino Acids and Proteins

Valylalanine and alanylvaline are constitutional isomers.

Which of the following natural amino acids is an R-isomer?

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

Which of the following amino acids has a basic side chain?

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

What is the isoelectric point of glutamic acid (pKa of α\alphaα -CO2H, 2.10; pKa of β\betaβ -CO2H, 4.07; pH of α\alphaα -NH2, 9.47)?

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

MATCH a structure from the list below to each of the following terms. Place the letter of the structure in the blank to the left of the term which it describes. -_____ is a carboxyl-protected amino acid.

Which of the following amino acids is a secondary amine?

Which of the following is a definition of the isoelectric point of an amino acid?

Covalent Bonding and Shapes of Molecules

Alkanes and Cycloalkanes

Stereoisomerism and Chirality

Acids and Bases

Alkenes: Bonding, Nomenclature, and Properties

Reactions of Alkenes

Alkynes

Haloalkanes, Halogenation, and Radical Reactions

Nucleophilic Substitution and Beta-Elimination

Alcohols

Ethers, Epoxides, and Sulfides

Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Mass Spectrometry

An Introduction to Organometallic Compounds

Aldehydes and Ketones

Carboxylic Acids

Functional Derivatives of Carboxylic Acids

Enolate Anions and Enamines

Dienes, Conjugated Systems, and Pericyclic Reactions

Benzene and the Concept of Aromaticity

Reactions of Benzene and Its Derivatives

Amines

Catalytic Carbon-Carbon Bond Formation

Carbohydrates

Lipids

Nucleic Acids

Organic Polymer Chemistry

Filters

What is the isoelectric point of glutamic acid (pK_a of $\alpha$ -CO₂H, 2.10; pK_a of $\beta$ -CO₂H, 4.07; pH of $\alpha$ -NH₂, 9.47)?