Question 1

What is the product obtained from the mild oxidation of the thiol shown below? mild
2 R-SH

Accepted Answer

A) R-S-R 
B) R-OH 
C) R-S-S-R 
D) R-OO-R 
E) R-S-OH 
A) R-S-R 
B) R-OH 
C) R-S-S-R 
D) R-OO-R 
E) R-S-OH

Question 2

Rate the following amino acids in decreasing order of migration towards the cathode (negative electrode)when separated by electrophoresis in a solution of pH= 7.3.
I. lysine: pI= 9.87
II. alanine: pI= 6.02
III. aspartate: pI= 5.95

Accepted Answer

The answer of Rate the following amino acids in decreasing...

Question 3

Draw the dipeptide Val-Tyr at pH 7.0.

Accepted Answer

The answer of Draw the dipeptide Val-Tyr at pH 7.0....

Question 4

Draw the predominant form of aspartate at physiological pH.

Accepted Answer

The answer of Draw the predominant form of aspartate at...

Question 5

What is electrophoresis?

Accepted Answer

A) a technique that separates amino acids on the basis of their polarity 
B) a technique that separates amino acids on the basis of their solubility in water 
C) a technique that separates amino acids on the basis of their pI values 
D) a technique that separates amino acids on the basis of pKa of α-COOH values 
E) a technique that separates amino acids on the basis of pKa of α-+NH3 values 
A) a technique that separates amino acids on the basis of their polarity 
B) a technique that separates amino acids on the basis of their solubility in water 
C) a technique that separates amino acids on the basis of their pI values 
D) a technique that separates amino acids on the basis of pKa of α-COOH values 
E) a technique that separates amino acids on the basis of pKa of α-+NH3 values

Question 6

Draw glutamate.

Accepted Answer

The answer of Draw glutamate....

Question 7

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

Accepted Answer

A separation technique in which an enzym

Question 8

Which type of protein, globular or fibrous, tends to function primarily as structural parts of an organism?

Accepted Answer

The answer of Which type of protein, globular or fibrous,...

Question 9

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

Accepted Answer

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

Question 10

Which of the following structures can polypeptides have?

Accepted Answer

A) primary structure 
B) secondary structure 
C) tertiary structure 
D) quaternary structure 
E) all of the above 
A) primary structure 
B) secondary structure 
C) tertiary structure 
D) quaternary structure 
E) all of the above

Question 11

Draw vertical lines through the peptide bonds in the decapeptide below that will be cleaved by cyanogen bromide.
Try-Ser-Ala-Met-Ser-Pro-Met-Gly-Gly-Asp

Accepted Answer

The answer of Draw vertical lines through the peptide bonds...

Question 12

Describe what a β-pleated sheet is and explain the difference between parallel and anti-parallel β-pleated sheets.

Accepted Answer

A β-pleated sheet is a type of secondary

Question 13

Which of the following amino acids has a heterocyclic R group?

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 14

Which of the following amino acids has the highest isoelectric point?

Accepted Answer

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

Question 15

Which of the following protein structures does denaturation destroy?

Accepted Answer

A) primary and secondary structures 
B) secondary and tertiary structures 
C) tertiary and quaternary structures 
D) secondary, tertiary, and quaternary structures 
A) primary and secondary structures 
B) secondary and tertiary structures 
C) tertiary and quaternary structures 
D) secondary, tertiary, and quaternary structures

Question 16

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 17

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 18

Which of the following amino acids will be closest to the origin when separated by thin-layer chromatography?

Accepted Answer

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

Question 19

Provide the structure of Thr-Gln-Met at pH 7.0.

Accepted Answer

The answer of Provide the structure of Thr-Gln-Met at pH...

Question 20

The monomeric units that make up peptides and protein polymers are ________.

Accepted Answer

A) nucleic acids 
B) amino acids 
C) oligosaccharides 
D) amylopectins 
E) celluloses 
A) nucleic acids 
B) amino acids 
C) oligosaccharides 
D) amylopectins 
E) celluloses

Exam 22: Amino Acids, Peptides, and Proteins

What is the product obtained from the mild oxidation of the thiol shown below? mild 2 R-SH

Rate the following amino acids in decreasing order of migration towards the cathode (negative electrode)when separated by electrophoresis in a solution of pH= 7.3. I. lysine: pI= 9.87 II. alanine: pI= 6.02 III. aspartate: pI= 5.95

Draw the dipeptide Val-Tyr at pH 7.0.

Draw the predominant form of aspartate at physiological pH.

What is electrophoresis?

Draw glutamate.

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

Which type of protein, globular or fibrous, tends to function primarily as structural parts of an organism?

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

Which of the following structures can polypeptides have?

Draw vertical lines through the peptide bonds in the decapeptide below that will be cleaved by cyanogen bromide. Try-Ser-Ala-Met-Ser-Pro-Met-Gly-Gly-Asp

Describe what a β-pleated sheet is and explain the difference between parallel and anti-parallel β-pleated sheets.

Which of the following amino acids has a heterocyclic R group?

Which of the following amino acids has the highest isoelectric point?

Which of the following protein structures does denaturation destroy?

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

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

Which of the following amino acids will be closest to the origin when separated by thin-layer chromatography?

Provide the structure of Thr-Gln-Met at pH 7.0.

The monomeric units that make up peptides and protein polymers are ________.

Remembering General Chemistry: Electronic Structure and Bonding

Acids and Bases: Central to Understanding Organic Chemistry

An Introduction to Organic Compounds

Isomers: the Arrangement of Atoms in Space

Alkenes Thermodynamics and Kinetics

Reactions of Alkenes

Reactions of Alkynes Introduction to Multistep Synthesis

Electron Delocalization, Resonance, and Aromaticity More About Molecular Orbital Theory

Substitution Reactions of Alkyl Halides

Elimination Reactions of Alkyl Halides Competition Between Substitution and Elimination

Reactions of Alcohols, Ethers, Epoxides, and Sulfur-Containing Compounds

Organometallic Compounds

Reactions of Alkanes, 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 Alpha Carbon of Carbonyl Compounds

Reactions of Benzene and Substituted Benzenes

More About Amines Heterocylic Compounds

Carbohydrates

Catalysis

The Organic Mechanisms of the Coenzymes

The Chemistry of Metabolism

Nucleosides, Nucleotides, and Nucleic Acids

Synthetic Polymers

Pericyclic Reactions

Filters