Question 1

What is the three letter abbreviation for the amino acid sequence of the following peptide?

Accepted Answer

Ile-Tyr-Se

Question 2

A peptide with 12 amino acid residues produced the following fragments when treated with trypsin and chymotrypsin. Edman degradation of this peptide produced the phenylthiohydantoin derivative of glycine. What is the structure of this peptide?
Trypsin: Gly-Leu-Phe-Arg, Cys-Tyr-Ile-Gly, Val-Trp-Ser-Lys
Chymotrypsin: Gly-Leu-Phe, Ser-Lys-Cys-Tyr, Ile-Gly, Arg-Val-Trp,

Accepted Answer

Gly-Leu-Ph

Question 3

Which of the following aldehydes would produce isoleucine using a Strecker synthesis?

Accepted Answer

A)  3-methylbutanal 
B)  2-methylbutanal 
C)  2-methylpropanal 
D)  propanal 
E)  none of these 
A)  3-methylbutanal 
B)  2-methylbutanal 
C)  2-methylpropanal 
D)  propanal 
E)  none of these

Question 4

How will you prepare phenylalanine using a Hell-Volhard-Zelinski reaction?

Accepted Answer

@#IMG-DLM&_TB4454_00

Question 5

Which amino acid is produced from the following reaction sequence?

Accepted Answer

A)  alanine 
B)  valine 
C)  leucine 
D)  isoleucine 
E)  none of these 
A)  alanine 
B)  valine 
C)  leucine 
D)  isoleucine 
E)  none of these

Question 6

The secondary structure of a protein is due to ________ between amino acid residues.

Accepted Answer

A)  hydrophobic interactions 
B)  hydrogen bonding 
C)  salt bridges 
D)  disulfide linkage 
E)  covalent bonding 
A)  hydrophobic interactions 
B)  hydrogen bonding 
C)  salt bridges 
D)  disulfide linkage 
E)  covalent bonding

Question 7

Which one of the following amino acids contain a hydroxyl side chain?

Accepted Answer

A)  cysteine 
B)  serine 
C)  glutamine 
D)  leucine 
E)  proline 
A)  cysteine 
B)  serine 
C)  glutamine 
D)  leucine 
E)  proline

Question 8

Which of the following is the predominant form of serine at physiological pH?

Accepted Answer

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

Question 9

Draw the Fischer projection for L-cysteine and assign the configuration (R/S) at the chirality center.

Accepted Answer

The answer of Draw the Fischer projection for L-cysteine and...

Question 10

What is the correct sequence of amino acids for the following tripeptide?

Accepted Answer

A)  Ser-Met-Ile 
B)  Ser-Cys-Ile 
C)  Thr-Met-Leu 
D)  Thr-Cys-Leu 
E)  Ile-Met-Thr 
A)  Ser-Met-Ile 
B)  Ser-Cys-Ile 
C)  Thr-Met-Leu 
D)  Thr-Cys-Leu 
E)  Ile-Met-Thr

Question 11

The ______ structure of a protein is most important because the ______of the amino acids determines its overall shape, function and properties.

Accepted Answer

A)  primary, twisting 
B)  primary, sequence 
C)  secondary, twisting 
D)  secondary, folding 
E)  tertiary, folding 
A)  primary, twisting 
B)  primary, sequence 
C)  secondary, twisting 
D)  secondary, folding 
E)  tertiary, folding

Question 12

When three amino acids are connected to each other, they form ____________.

Accepted Answer

A)  a tripeptide 
B)  a protein 
C)  a polypeptide 
D)  a tetrapeptide 
E)  a dipeptide 
A)  a tripeptide 
B)  a protein 
C)  a polypeptide 
D)  a tetrapeptide 
E)  a dipeptide

Question 13

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

Accepted Answer

A)  I and II 
B)  I, II and IV 
C)  III and V 
D)  I, II, III and IV 
E)  all of these 
A)  I and II 
B)  I, II and IV 
C)  III and V 
D)  I, II, III and IV 
E)  all of these

What is the three letter abbreviation for the amino acid sequence of the following peptide?

Which of the following aldehydes would produce isoleucine using a Strecker synthesis?

How will you prepare phenylalanine using a Hell-Volhard-Zelinski reaction?

Which amino acid is produced from the following reaction sequence?

The secondary structure of a protein is due to ________ between amino acid residues.

Which one of the following amino acids contain a hydroxyl side chain?

Which of the following is the predominant form of serine at physiological pH?

Draw the Fischer projection for L-cysteine and assign the configuration (R/S) at the chirality center.

What is the correct sequence of amino acids for the following tripeptide?

The structure of a protein is most important because the of the amino acids determines its overall shape, function and properties.

When three amino acids are connected to each other, they form ____________.

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

A Review of General Chemistry: Electrons, Bonds, and Molecular Properties

Molecular Representations

Acids and Bases

Alkanes and Cycloalkanes

Stereoisomerism

Chemical Reactivity and Mechanisms

Alkyl Halides: Nucleophilic Substitution and Elimination Reactions

Addition Reactions of Alkenes

Alkynes

Radical Reactions

Synthesis

Alcohols and Phenols

Ethers and Epoxides; Thiols and Sulfides

Infrared Spectroscopy and Mass Spectrometry

Nuclear Magnetic Resonance Spectroscopy

Conjugated Pi Systems and Pericyclic Reactions

Aromatic Compounds

Aromatic Substitution Reactions

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Alpha Carbon Chemistry: Enols and Enolates

Amines

Introduction to Organometallic Compounds

Carbohydrates

Lipids

Synthetic Polymers

Filters

Exam 25: Amino Acids, Peptides, and Proteins

What is the three letter abbreviation for the amino acid sequence of the following peptide?

Which of the following aldehydes would produce isoleucine using a Strecker synthesis?

How will you prepare phenylalanine using a Hell-Volhard-Zelinski reaction?

Which amino acid is produced from the following reaction sequence?

The secondary structure of a protein is due to ________ between amino acid residues.

Which one of the following amino acids contain a hydroxyl side chain?

Which of the following is the predominant form of serine at physiological pH?

Draw the Fischer projection for L-cysteine and assign the configuration (R/S) at the chirality center.

What is the correct sequence of amino acids for the following tripeptide?

The ______ structure of a protein is most important because the ______of the amino acids determines its overall shape, function and properties.

When three amino acids are connected to each other, they form ____________.

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

A Review of General Chemistry: Electrons, Bonds, and Molecular Properties

Molecular Representations

Acids and Bases

Alkanes and Cycloalkanes

Stereoisomerism

Chemical Reactivity and Mechanisms

Alkyl Halides: Nucleophilic Substitution and Elimination Reactions

Addition Reactions of Alkenes

Alkynes

Radical Reactions

Synthesis

Alcohols and Phenols

Ethers and Epoxides; Thiols and Sulfides

Infrared Spectroscopy and Mass Spectrometry

Nuclear Magnetic Resonance Spectroscopy

Conjugated Pi Systems and Pericyclic Reactions

Aromatic Compounds

Aromatic Substitution Reactions

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Alpha Carbon Chemistry: Enols and Enolates

Amines

Introduction to Organometallic Compounds

Carbohydrates

Lipids

Synthetic Polymers

Filters

The structure of a protein is most important because the of the amino acids determines its overall shape, function and properties.