Question 1

The hydrogen bonding between the carbonyl group of an amino acid with the amino group of the fourth amino acid farther along the chain leads to ______.

Accepted Answer

A)  (parallel $\beta$-pleated sheets) 
B) ( antiparallel $\beta$-pleated sheets) 
C)  ($\alpha$-helix) 
D)  ($\beta$-helix) 
E)  none of these 
A)  (parallel $\beta$-pleated sheets) 
B) ( antiparallel $\beta$-pleated sheets) 
C)  ($\alpha$-helix) 
D)  ($\beta$-helix) 
E)  none of these

Question 2

Which of the following is a correct bond-line structure for the tripeptide Ser-Lys-Cys?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  none of these

Question 3

The method developed by ______ is used to prepare larger peptides.

Accepted Answer

A)  Edman 
B)  Strecker 
C)  Merrifield 
D)  Hell-Volhardt-Zelinski 
A)  Edman 
B)  Strecker 
C)  Merrifield 
D)  Hell-Volhardt-Zelinski

Question 4

Which of the following is true about the amino acids with isoelectric point around pH 10?

Accepted Answer

A)  The side chain must be acidic. 
B)  The side chain must be basic. 
C)  The side chain must be polar. 
D)  The side chain must be non polar. 
E)  none of these 
A)  The side chain must be acidic. 
B)  The side chain must be basic. 
C)  The side chain must be polar. 
D)  The side chain must be non polar. 
E)  none of these

Question 5

The pH at which the concentration of the zwitterionic form of an amino acid is at a maximum value is called the _______.

Accepted Answer

A)  dipolar point 
B)  electric point 
C)  neutral point 
D)  isoelectric point 
E)  none of these 
A)  dipolar point 
B)  electric point 
C)  neutral point 
D)  isoelectric point 
E)  none of these

Question 6

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

Accepted Answer

A)  a tripeptide 
B)  a protein 
C)  a polypeptide 
D)  a tetrapeptide 
E)  none of these 
A)  a tripeptide 
B)  a protein 
C)  a polypeptide 
D)  a tetrapeptide 
E)  none of these

Question 7

Which of the following is the correct sequence for the pentapeptide that is formed by the following reaction sequence?

Accepted Answer

A)  Leu-Lys-Ala-Gly-Met 
B)  Met-Gly-Ala-Lys-Leu 
C)  Cys- Gly-Ala-Lys-Leu 
D)  Leu-Lys-Ala-Gly-Cys 
E)  none of these 
A)  Leu-Lys-Ala-Gly-Met 
B)  Met-Gly-Ala-Lys-Leu 
C)  Cys- Gly-Ala-Lys-Leu 
D)  Leu-Lys-Ala-Gly-Cys 
E)  none of these

Question 8

Amino acids are connected to each other by____________.

Accepted Answer

A)  an ether linkage 
B)  a peptide linkage 
C)  an ester linkage 
D)  an amide linkage 
E)  both B and D 
A)  an ether linkage 
B)  a peptide linkage 
C)  an ester linkage 
D)  an amide linkage 
E)  both B and D

Question 9

Proteins that are chains that are coiled into compact shapes are classified as________.

Accepted Answer

A)  globular proteins 
B)  fibrous proteins 
C)  lipoproteins 
D)  tetrapeptides 
E)  pleated sheets 
A)  globular proteins 
B)  fibrous proteins 
C)  lipoproteins 
D)  tetrapeptides 
E)  pleated sheets

Question 10

Which one of the following amino acids contain a sulfur atom?

Accepted Answer

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

Question 11

Which of the following is used to detect the presence of amino acids using chromatography?

Accepted Answer

A)  2,4-DNP 
B)  methyl orange 
C)  phenolphthalein 
D)  ninhydrin 
E)  methyl red 
A)  2,4-DNP 
B)  methyl orange 
C)  phenolphthalein 
D)  ninhydrin 
E)  methyl red

Question 12

Which of the following amino acids have a pI around pH 10?

Accepted Answer

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

Question 13

Provide the structure of the predominant form of the following amino acids at pH 7 and predict the migration towards anode or cathode during electrophoresis.

Accepted Answer

The answer of Provide the structure of the predominant form...

Question 14

_______________ are certain proteins that serve as catalysts for most of the reactions in living cells.

Accepted Answer

The answer of _______________ are certain proteins that serve as...

Question 15

Proteins found in humans have all amino acids with ____configuration.

Accepted Answer

A)  D 
B)  L 
C)  meso 
D)  A and B 
E)  none of these 
A)  D 
B)  L 
C)  meso 
D)  A and B 
E)  none of these

Question 16

Denaturation of proteins results in loss of ________structure.

Accepted Answer

A)  primary 
B)  secondary 
C)  tertiary 
D)  B and C 
E)  A, B and C 
A)  primary 
B)  secondary 
C)  tertiary 
D)  B and C 
E)  A, B and C

Question 17

Which of the following is a zwitterion for alanine?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  both I and IV 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  both I and IV

Question 18

Which of the following peptides results after a single Edman degradation of the tetrapeptide Gly-Phe-Tyr-Ser?

Accepted Answer

A)  Gly-Phe-Tyr 
B)  Tyr-Ser 
C)  Phe-Tyr-Ser 
D)  Gly-Phe 
E)  Ser 
A)  Gly-Phe-Tyr 
B)  Tyr-Ser 
C)  Phe-Tyr-Ser 
D)  Gly-Phe 
E)  Ser

Question 19

In the Hell-Volhard-Zelinski reaction, the ___- carbon of the carboxylic acid is halogenated.

Accepted Answer

A)  alpha 
B)  beta 
C)  gamma 
D)  delta 
E)  epsilon 
A)  alpha 
B)  beta 
C)  gamma 
D)  delta 
E)  epsilon

Question 20

Draw a bond-line structure for the tetrapeptide Ile-Ser-Leu-Gly.

Accepted Answer

The answer of Draw a bond-line structure for the tetrapeptide...

Exam 25: Amino Acids, Peptides, and Proteins

The hydrogen bonding between the carbonyl group of an amino acid with the amino group of the fourth amino acid farther along the chain leads to ______.

Which of the following is a correct bond-line structure for the tripeptide Ser-Lys-Cys?

The method developed by ______ is used to prepare larger peptides.

Which of the following is true about the amino acids with isoelectric point around pH 10?

The pH at which the concentration of the zwitterionic form of an amino acid is at a maximum value is called the _______.

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

Which of the following is the correct sequence for the pentapeptide that is formed by the following reaction sequence?

Amino acids are connected to each other by____________.

Proteins that are chains that are coiled into compact shapes are classified as________.

Which one of the following amino acids contain a sulfur atom?

Which of the following is used to detect the presence of amino acids using chromatography?

Which of the following amino acids have a pI around pH 10?

Provide the structure of the predominant form of the following amino acids at pH 7 and predict the migration towards anode or cathode during electrophoresis.

_______________ are certain proteins that serve as catalysts for most of the reactions in living cells.

Proteins found in humans have all amino acids with ____configuration.

Denaturation of proteins results in loss of ________structure.

Which of the following is a zwitterion for alanine?

Which of the following peptides results after a single Edman degradation of the tetrapeptide Gly-Phe-Tyr-Ser?

In the Hell-Volhard-Zelinski reaction, the ___- carbon of the carboxylic acid is halogenated.

Draw a bond-line structure for the tetrapeptide Ile-Ser-Leu-Gly.

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