Question 1

​ Which of the following statements is true of resonance structures?

Accepted Answer

A)  Resonance structures differ from one another only in the positioning of electrons. 
B)  Resonance structures differ from one another only in the number of electrons. 
C)  Two resonance structures will always have the same number of single bonds and double bonds. 
D)  Two resonance structures will always have single bonds and double bonds in the same position. 
A)  Resonance structures differ from one another only in the positioning of electrons. 
B)  Resonance structures differ from one another only in the number of electrons. 
C)  Two resonance structures will always have the same number of single bonds and double bonds. 
D)  Two resonance structures will always have single bonds and double bonds in the same position.

Question 2

How many different tripeptides can be assembled using one molecule each of the amino acids glycine, glutamic acid, and lysine?

Accepted Answer

A)  3 
B)  6 
C)  9 
D)  27 
A)  3 
B)  6 
C)  9 
D)  27

Question 3

Which of the following has no L or D configuration?

Accepted Answer

A)  Glyceraldehyde 
B)  Proline 
C)  Glycine 
D)  All of these have an L or D configuration 
A)  Glyceraldehyde 
B)  Proline 
C)  Glycine 
D)  All of these have an L or D configuration

Question 4

Which of the following is the most similar between oxytocin and vasopressin?

Accepted Answer

A)  their biological function 
B)  their amino acid sequences 
C)  their isoelectric point 
D)  their overall structure 
A)  their biological function 
B)  their amino acid sequences 
C)  their isoelectric point 
D)  their overall structure

Question 5

The peptide bond

Accepted Answer

A)  is formed by elimination of water between two amino groups in an amindo acid 
B)  limits the possible orientations of the peptide backbone in a protein 
C)  has acidic and basic characteristics 
D)  all of these 
A)  is formed by elimination of water between two amino groups in an amindo acid 
B)  limits the possible orientations of the peptide backbone in a protein 
C)  has acidic and basic characteristics 
D)  all of these

Question 6

Exhibit 3B A titration curve.   Refer to Exhibit 3B. Which point most likely represents the pK for the carboxyl group?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 7

The method for separating molecules on the basis of the ratio of their charge to size is called _____.

Accepted Answer

A)  electrolysis 
B)  electrophoresis 
C)  electroplating 
D)  electroporation 
A)  electrolysis 
B)  electrophoresis 
C)  electroplating 
D)  electroporation

Question 8

Exhibit 3B A titration curve.   Refer to Exhibit 3B. Which points on the graph represent pK's?

Accepted Answer

A)  1 and 7 
B)  2, 4 and 6 
C)  3 and 5 
D)  2, 3, 4, 5 and 6 
E)  The pKs cannot be determined without more information. 
A)  1 and 7 
B)  2, 4 and 6 
C)  3 and 5 
D)  2, 3, 4, 5 and 6 
E)  The pKs cannot be determined without more information.

Question 9

Exhibit 3A (for this chapter)   Refer to Exhibit 3A. What is the order of the pIs in increasing order (from acid to base)?

Accepted Answer

A)  Alanine, Arginine, Asparagine, Cysteine, and Aspartic Acid 
B)  Aspartic Acid, Alanine, Asparagine, Cysteine, and Arginine 
C)  Aspartic Acid, Cysteine, Asparagine, Alanine, and Arginine 
D)  Arginine, Alanine, Asparagine, Cysteine, and Aspartic Acid 
E)  Aspartic Acid, Cysteine, Arginine, Alanine, and Asparagine, 
A)  Alanine, Arginine, Asparagine, Cysteine, and Aspartic Acid 
B)  Aspartic Acid, Alanine, Asparagine, Cysteine, and Arginine 
C)  Aspartic Acid, Cysteine, Asparagine, Alanine, and Arginine 
D)  Arginine, Alanine, Asparagine, Cysteine, and Aspartic Acid 
E)  Aspartic Acid, Cysteine, Arginine, Alanine, and Asparagine,

Question 10

Which of the following correctly lists the isoelectric pH's of asp, asn, and arg from lowest to highest?

Accepted Answer

A)  D N R 
B)  D R N 
C)  R N D 
D)  R D N 
E)  N R D
F) N D R 
A)  D N R 
B)  D R N 
C)  R N D 
D)  R D N 
E)  N R D
F) N D R

Question 11

Exhibit 3B A titration curve.   Refer to Exhibit 3B. At which point would the amino acid have its maximum negative charge?

Accepted Answer

A)  1 
B)  2 
C)  4 
D)  6 
E)  7 
A)  1 
B)  2 
C)  4 
D)  6 
E)  7

Question 12

What is the predominant form of the amino acid abbreviated R at pH 7?

Accepted Answer

A)  positive 
B)  neutral 
C)  negative 
A)  positive 
B)  neutral 
C)  negative

Question 13

Which amino acids would migrate furthest toward the anode (positive electrode) during electrophoresis?

Accepted Answer

A)  Aspartic acid. 
B)  Arginine. 
C)  Tyrosine. 
D)  Histidine. 
E)  Glutamine. 
A)  Aspartic acid. 
B)  Arginine. 
C)  Tyrosine. 
D)  Histidine. 
E)  Glutamine.

Question 14

The isoelectric pH of glycine is closest to

Accepted Answer

A)  pH 4 
B)  pH 6 
C)  pH 8 
D)  pH 10 
A)  pH 4 
B)  pH 6 
C)  pH 8 
D)  pH 10

Question 15

Which amino acid has a benzene-like ring?

Accepted Answer

A)  Glutamic Acid 
B)  Histidine 
C)  Isoleucine 
D)  Serine 
E)  Tyrosine 
A)  Glutamic Acid 
B)  Histidine 
C)  Isoleucine 
D)  Serine 
E)  Tyrosine

Question 16

What is the predominant form of the amino acid abbreviated E at pH 7?

Accepted Answer

A)  positive 
B)  neutral 
C)  negative 
A)  positive 
B)  neutral 
C)  negative

Question 17

The absolute configuration of amino acids are denoted by their relationship to the L- or D- forms of

Accepted Answer

A)  glyceraldehyde 
B)  glucose 
C)  tartaric acid 
D)  alanine 
A)  glyceraldehyde 
B)  glucose 
C)  tartaric acid 
D)  alanine

Question 18

Which amino acid would have the greatest negative charge at pH = 7.0?

Accepted Answer

A)  Glutamic Acid 
B)  Histidine 
C)  Isoleucine 
D)  Serine 
E)  Tyrosine 
A)  Glutamic Acid 
B)  Histidine 
C)  Isoleucine 
D)  Serine 
E)  Tyrosine

Question 19

Which amino acid takes on a negative charge when the R-group loses a proton?

Accepted Answer

A)  Glutamic Acid 
B)  Histidine 
C)  Glutamine 
D)  Tyrosine 
E)  Glutamic Acid and Tyrosine 
A)  Glutamic Acid 
B)  Histidine 
C)  Glutamine 
D)  Tyrosine 
E)  Glutamic Acid and Tyrosine

Question 20

Which group consists only of amino acids with polar side chains?

Accepted Answer

A)  serine, threonine, and leucine 
B)  serine, threonine, and cysteine 
C)  serine, threonine, and valine 
D)  serine, threonine, and isoleucine 
A)  serine, threonine, and leucine 
B)  serine, threonine, and cysteine 
C)  serine, threonine, and valine 
D)  serine, threonine, and isoleucine

Exam 3: Amino Acids and Peptides

​ Which of the following statements is true of resonance structures?

How many different tripeptides can be assembled using one molecule each of the amino acids glycine, glutamic acid, and lysine?

Which of the following has no L or D configuration?

Which of the following is the most similar between oxytocin and vasopressin?

The peptide bond

Exhibit 3B A titration curve. Refer to Exhibit 3B. Which point most likely represents the pK for the carboxyl group?

The method for separating molecules on the basis of the ratio of their charge to size is called _____.

Exhibit 3B A titration curve. Refer to Exhibit 3B. Which points on the graph represent pK's?

Exhibit 3A (for this chapter) Refer to Exhibit 3A. What is the order of the pIs in increasing order (from acid to base)?

Which of the following correctly lists the isoelectric pH's of asp, asn, and arg from lowest to highest?

Exhibit 3B A titration curve. Refer to Exhibit 3B. At which point would the amino acid have its maximum negative charge?

What is the predominant form of the amino acid abbreviated R at pH 7?

Which amino acids would migrate furthest toward the anode (positive electrode) during electrophoresis?

The isoelectric pH of glycine is closest to

Which amino acid has a benzene-like ring?

What is the predominant form of the amino acid abbreviated E at pH 7?

The absolute configuration of amino acids are denoted by their relationship to the L- or D- forms of

Which amino acid would have the greatest negative charge at pH = 7.0?

Which amino acid takes on a negative charge when the R-group loses a proton?

Which group consists only of amino acids with polar side chains?

Biochemistry and the Organization of Cells

Water the Solvent for Biochemical Reactions

The Three Dimensional Structure of Proteins

Protein Purification and Characterization Techniques

The Behavior of Proteins Enzymes

The Behavior of Proteins Enzymes Mechanisms and Control

Lipids and Proteins Are Associated in Biological Membranes

Nucleic Acids How Structure Conveys Information

Biosynthesis of Nucleic Acids Replication

Transcription of the Genetic Code the Biosynthesis of Rna

Protein Synthesis Translation of the Genetic Message

Nucleic Acid Biotechnology Techniques

Viruses Cancer and Immunology

The Importance of Energy Changes and Electron Transfer in Metabolism

Carbohydrates

Glycolysis

Storage Mechanisms and Control in Carbohydrate Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Lipid Metabolism

Photosynthesis

The Metabolism of Nitrogen

Integration of Metabolism Cellular Signaling

Filters

Which of the following statements is true of resonance structures?