Question 1

Which of the following molecules is the skeletal structure of an amino acid?

Accepted Answer

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

Question 2

Which of the following amino acids has its isoelectric point at the lowest pH?

Accepted Answer

A) glutamic acid 
B) lysine 
C) valine 
D) glycine 
E) methionine 
A) glutamic acid 
B) lysine 
C) valine 
D) glycine 
E) methionine

Question 3

The conversion of thiols to disulfide represents a(n)

Accepted Answer

A) oxidation. 
B) reduction. 
C) elimination. 
D) substitution. 
E) tautomerization. 
A) oxidation. 
B) reduction. 
C) elimination. 
D) substitution. 
E) tautomerization.

Question 4

What peptide remains after two sequential Edman degradations of the pentapeptide Ser-Pro-Gly-Phe-Arg?

Accepted Answer

A) Pro-Gly-Phe 
B) Ser-Pro-Gly 
C) Gly-Phe-Arg 
D) Pro-Gly 
E) Phe-Arg 
A) Pro-Gly-Phe 
B) Ser-Pro-Gly 
C) Gly-Phe-Arg 
D) Pro-Gly 
E) Phe-Arg

Question 5

Give the product for the following reaction.

Accepted Answer

A) alanine 
B) leucine 
C) valine 
D) isoleucine 
E) glycine 
A) alanine 
B) leucine 
C) valine 
D) isoleucine 
E) glycine

Question 6

Draw and name the amino acids which may be described as heterocyclic.

Accepted Answer

The answer of Draw and name the amino acids which...

Question 7

The α-carbon of all the amino acids is a chirality center except for

Accepted Answer

A) glycine 
B) threonine 
C) proline 
D) aspartic acid 
E) arginine 
A) glycine 
B) threonine 
C) proline 
D) aspartic acid 
E) arginine

Question 8

Which of the following best describes the side chain of arginine at a pH of 11?

Accepted Answer

A) hydrophobic 
B) nonpolar 
C) charged and polar 
D) uncharged but polar 
E) aprotic 
A) hydrophobic 
B) nonpolar 
C) charged and polar 
D) uncharged but polar 
E) aprotic

Question 9

Draw the form of L-lysine which is present at biological pH.

Accepted Answer

The answer of Draw the form of L-lysine which is...

Question 10

Consider the two peptides shown below.Which of the following methods would be able to distinguish between these two sequences? Ala-Met-Val-Leu-Gly-Gly-Phe-Glu-Arg-Val
And
Ala-Val-Gly-Glu-Val-Met-Leu-Gly-Arg-Phe

Accepted Answer

A) one cycle of Edman's reagent 
B) chymotrypsin digestion 
C) complete hydrolysis of all peptide bonds 
D) both A and B 
E) none of the above 
A) one cycle of Edman's reagent 
B) chymotrypsin digestion 
C) complete hydrolysis of all peptide bonds 
D) both A and B 
E) none of the above

Question 11

Give the product for the following reaction.

Accepted Answer

A) alanine 
B) leucine 
C) valine 
D) isoleucine 
E) glycine 
A) alanine 
B) leucine 
C) valine 
D) isoleucine 
E) glycine

Question 12

Explain what is meant by kinetic resolution and give an example.

Accepted Answer

A separation technique in which an enzym

Question 13

Which of the following best represents the structure of an amino acid in basic solution (pH = 11)?

Accepted Answer

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

Question 14

In conventional peptide synthesis,the nitrogen of a given amino acid must be deactivated or blocked while the carboxyl group is activated.Which of the following reagents is used to protect the amino group of an amino acid?

Accepted Answer

A) di-tert-butyl dicarbonate 
B) dicyclohexylcarbodiimide 
C) ninhydrin 
D) trifluoroacetic acid 
E) phenylisothiocyanate 
A) di-tert-butyl dicarbonate 
B) dicyclohexylcarbodiimide 
C) ninhydrin 
D) trifluoroacetic acid 
E) phenylisothiocyanate

Question 15

Which of the following amino acids has a sulfur in the R group?

Accepted Answer

A) serine 
B) cysteine 
C) asparagine 
D) tyrosine 
E) leucine 
A) serine 
B) cysteine 
C) asparagine 
D) tyrosine 
E) leucine

Question 16

Which of the following amino acids has a side chain with an ionizable proton and can exist in four different forms,depending on the pH of the solution?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 17

Which of the following is an L-amino acid?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 18

Provide the major organic product(s)of the reaction below.

Accepted Answer

The answer of Provide the major organic product(s)of the reaction...

Question 19

Give the product for the following reaction.

Accepted Answer

A) alanine 
B) leucine 
C) valine 
D) isoleucine 
E) glycine 
A) alanine 
B) leucine 
C) valine 
D) isoleucine 
E) glycine

Question 20

Draw the structure of the tetrapeptide Ser-Leu-Phe-Pro at pH 7.0.

Accepted Answer

The answer of Draw the structure of the tetrapeptide Ser-Leu-Phe-Pro...

Exam 21: Amino Acids,peptides,and Proteins

Which of the following molecules is the skeletal structure of an amino acid?

Which of the following amino acids has its isoelectric point at the lowest pH?

The conversion of thiols to disulfide represents a(n)

What peptide remains after two sequential Edman degradations of the pentapeptide Ser-Pro-Gly-Phe-Arg?

Give the product for the following reaction.

Draw and name the amino acids which may be described as heterocyclic.

The α-carbon of all the amino acids is a chirality center except for

Which of the following best describes the side chain of arginine at a pH of 11?

Draw the form of L-lysine which is present at biological pH.

Consider the two peptides shown below.Which of the following methods would be able to distinguish between these two sequences? Ala-Met-Val-Leu-Gly-Gly-Phe-Glu-Arg-Val And Ala-Val-Gly-Glu-Val-Met-Leu-Gly-Arg-Phe

Give the product for the following reaction.

Explain what is meant by kinetic resolution and give an example.

Which of the following best represents the structure of an amino acid in basic solution (pH = 11)?

In conventional peptide synthesis,the nitrogen of a given amino acid must be deactivated or blocked while the carboxyl group is activated.Which of the following reagents is used to protect the amino group of an amino acid?

Which of the following amino acids has a sulfur in the R group?

Which of the following amino acids has a side chain with an ionizable proton and can exist in four different forms,depending on the pH of the solution?

Which of the following is an L-amino acid?

Provide the major organic product(s)of the reaction below.

Give the product for the following reaction.

Draw the structure of the tetrapeptide Ser-Leu-Phe-Pro at pH 7.0.

Remembering General Chemistry: Electronic Structure and Bonding

Acids and Bases: Central to Understanding Organic Chemistry

An Introduction to Organic Compounds: Nomenclature, physical Properties, and Structure

Isomers: the Arrangement of Atoms in Space

Alkenes: Structure,nomenclature,and an Introduction to Reactivity - Thermodynamics and Kinetics

The Reactions of Alkenes - the Stereochemistry of Addition Reactions

The Reactions of Alkynes - Introduction to Multistep Synthesis

Delocalized Electrons: Their Effect on Stability, pka, and the Products of a Reaction - Aromaticity and Electronic Effects: an Introduction to the Reactions of Benzene

Substitution and Elimination Reactions of Alkyl Halides

Reactions of Alcohols, ethers, epoxides, amines and Sulfur-Containing Compounds

Organometallic Compounds

Radicals

Mass Spectrometry,infrared Spectroscopy,and Uvvis Spectroscopy

Nmr Spectroscopy

Reactions of Carboxylic Acids and Carboxylic Acid Derivatives

Reactions of Aldehydes and Ketones

Reactions at the Α-Carbon

Reactions of Benzene and Substituted Benzenes

More About Amines - Reactions of Heterocylic Compounds

The Organic Chemistry of Carbohydrates

Catalysis in Organic Reactions and in Enzymatic Reactions

The Organic Chemistry of the Coenzymes, compounds Derived From Vitamins

The Organic Chemistry of the Metabolic Pathways

The Organic Chemistry of Lipids

The Chemistry of the Nucleic Acids

Synthetic Polymers

Pericyclic Reactions

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