Question 1

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 2

Explain what essential amino acids are and list all of them.

Accepted Answer

An essential amino acid is one that huma

Question 3

Which of the following amino acids is not an aromatic compound?

Accepted Answer

A) phenylalanine 
B) threonine 
C) histidine 
D) tryptophan 
E) tyrosine 
A) phenylalanine 
B) threonine 
C) histidine 
D) tryptophan 
E) tyrosine

Question 4

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 5

Draw the form in which glutamate exists at pH = 0.

Accepted Answer

At pH = 0, groups wi

Question 6

Give the pH at which histidine exists in the following form.

Accepted Answer

A) 0 
B) 4 
C) 8 
D) 12 
E) 14 
A) 0 
B) 4 
C) 8 
D) 12 
E) 14

Question 7

What is the net charge of arginine in a solution of pH 1.0?

Accepted Answer

The answer of What is the net charge of arginine...

Question 8

Name the following compound.

Accepted Answer

A) cysteine 
B) threonine 
C) methionine 
D) serine 
E) asparagine 
A) cysteine 
B) threonine 
C) methionine 
D) serine 
E) asparagine

Question 9

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 10

Provide the structure of the tripeptide glu-ser-ala at pH 12.

Accepted Answer

The answer of Provide the structure of the tripeptide glu-ser-ala...

Question 11

Which of the following amino acids will be retained longest in the column when separated by cation-exchange chromatography?

Accepted Answer

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

Question 12

Which of the following amino acids has an aromatic 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 13

Name the following compound.

Accepted Answer

A) tyrosine 
B) lysine 
C) arginine 
D) histidine 
E) phenylalanine 
A) tyrosine 
B) lysine 
C) arginine 
D) histidine 
E) phenylalanine

Question 14

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 15

What is thin-layer chromatography?

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 16

Which of the following may characterize the secondary structure of proteins?

Accepted Answer

A) conformation of the protein backbone 
B) α-Helix 
C) parallel β-pleated sheet 
D) anti-parallel β-pleated sheet 
E) all of the above 
A) conformation of the protein backbone 
B) α-Helix 
C) parallel β-pleated sheet 
D) anti-parallel β-pleated sheet 
E) all of the above

Question 17

Draw the predominant form of histidine at pH=0.

Accepted Answer

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

Question 18

In peptide synthesis, give the use of di-tert-butyl dicarbonate.

Accepted Answer

A) activates the carboxyl group of an amino acid 
B) protects the carboxyl group of an amino acid 
C) protects the amino group of an amino acid 
D) activates the amino group of an amino acid 
E) removes the protecting group on the N-terminal amino acid 
A) activates the carboxyl group of an amino acid 
B) protects the carboxyl group of an amino acid 
C) protects the amino group of an amino acid 
D) activates the amino group of an amino acid 
E) removes the protecting group on the N-terminal amino acid

Question 19

When a disulfide linkage is formed, the compound containing this new linkage has been ________.

Accepted Answer

A) hydrolyzed 
B) dehydrated 
C) electrolyzed 
D) oxidized 
E) reduced 
A) hydrolyzed 
B) dehydrated 
C) electrolyzed 
D) oxidized 
E) reduced

Question 20

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

Exam 22: Amino Acids, Peptides, and Proteins

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

Explain what essential amino acids are and list all of them.

Which of the following amino acids is not an aromatic compound?

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

Draw the form in which glutamate exists at pH = 0.

Give the pH at which histidine exists in the following form.

What is the net charge of arginine in a solution of pH 1.0?

Name the following compound.

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

Provide the structure of the tripeptide glu-ser-ala at pH 12.

Which of the following amino acids will be retained longest in the column when separated by cation-exchange chromatography?

Which of the following amino acids has an aromatic R group?

Name the following compound.

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

What is thin-layer chromatography?

Which of the following may characterize the secondary structure of proteins?

Draw the predominant form of histidine at pH=0.

In peptide synthesis, give the use of di-tert-butyl dicarbonate.

When a disulfide linkage is formed, the compound containing this new linkage has been ________.

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

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

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