Question 1

Exhibit 3A (for this chapter)   Refer to Exhibit 3A.At pH 7,what percent of histidine has a neutral charge?

Accepted Answer

A)  9% 
B)  50% 
C)  91% 
D)  100% 
A)  9% 
B)  50% 
C)  91% 
D)  100%

Question 2

Exhibit 3B   A titration curve.
Refer to Exhibit 3B.The amino acid depicted by the titration curve is

Accepted Answer

A)  aspartic acid 
B)  histidine 
C)  lysine 
D)  tyrosine 
E)  lysine or tyrosine 
A)  aspartic acid 
B)  histidine 
C)  lysine 
D)  tyrosine 
E)  lysine or tyrosine

Question 3

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 4

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

Accepted Answer

A)  leucine and lysine 
B)  arginine and leucine 
C)  lysine and arginine 
D)  arginine and isoleucine 
A)  leucine and lysine 
B)  arginine and leucine 
C)  lysine and arginine 
D)  arginine and isoleucine

Question 5

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 6

Which amino acid has a polar,non-ionic R-group

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 7

Aspartame

Accepted Answer

A)  is a peptide derivative used as an artificial sweetener 
B)  contains phenylalanine and arginine 
C)  is extracted from asparagus 
D)  all of these 
A)  is a peptide derivative used as an artificial sweetener 
B)  contains phenylalanine and arginine 
C)  is extracted from asparagus 
D)  all of these

Question 8

The peptide bond

Accepted Answer

A)  is planar 
B)  can be written as a resonance hybrid 
C)  is the basis of protein structure. 
D)  all of the above 
A)  is planar 
B)  can be written as a resonance hybrid 
C)  is the basis of protein structure. 
D)  all of the above

Question 9

Given the R-groups in the peptide,ALA-GLN-ARG-SER-HIS,it would likely be:

Accepted Answer

A)  Very water soluble 
B)  Somewhat water soluble 
C)  Not very water soluble 
D)  Not soluble at all 
E)  You cannot tell from the sequence 
A)  Very water soluble 
B)  Somewhat water soluble 
C)  Not very water soluble 
D)  Not soluble at all 
E)  You cannot tell from the sequence

Question 10

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

Accepted Answer

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

Question 11

Which is a correct pair of abbreviations for an amino acid?

Accepted Answer

A)  Gln / N 
B)  Tyr / T 
C)  Asn / N 
D)  Phe / P 
E)  Pro / Q 
A)  Gln / N 
B)  Tyr / T 
C)  Asn / N 
D)  Phe / P 
E)  Pro / Q

Question 12

The net charge on the amino acid cys in a solution at pH 7 is closest to

Accepted Answer

A)  -2 
B)  -1. 
C)  0. 
D)  +1. 
A)  -2 
B)  -1. 
C)  0. 
D)  +1.

Question 13

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 14

Which groups of a pair of amino acids must react to form a peptide bond?

Accepted Answer

A)  the two carboxyls 
B)  the two aminos 
C)  the two R-groups 
D)  the carboxyl of one and the amino of the other 
A)  the two carboxyls 
B)  the two aminos 
C)  the two R-groups 
D)  the carboxyl of one and the amino of the other

Question 15

Exhibit 3A (for this chapter)   Refer to Exhibit 3A.Which of these amino acids could act as a good buffer at pH = 4.5

Accepted Answer

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

Question 16

This amino acid displays a free amino group in the peptide ALA-GLN-ARG-SER-HIS:

Accepted Answer

A)  ALA 
B)  GLN 
C)  SER 
D)  HIS 
A)  ALA 
B)  GLN 
C)  SER 
D)  HIS

Question 17

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 18

Which amino acid takes on a positive charge when the R-group gains a proton?

Accepted Answer

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

Question 19

Which of the following is not considered an uncommon amino acid?

Accepted Answer

A)  thyroxine 
B)  Hydroxylysine 
C)  Hydroxyproline 
D)  Tryptophan 
A)  thyroxine 
B)  Hydroxylysine 
C)  Hydroxyproline 
D)  Tryptophan

Question 20

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

Exam 3: Amino Acids and Peptides

Exhibit 3A (for this chapter) Refer to Exhibit 3A.At pH 7,what percent of histidine has a neutral charge?

Exhibit 3B A titration curve. Refer to Exhibit 3B.The amino acid depicted by the titration curve is

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

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

Which of the following has no L or D configuration?

Which amino acid has a polar,non-ionic R-group

Aspartame

The peptide bond

Given the R-groups in the peptide,ALA-GLN-ARG-SER-HIS,it would likely be:

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

Which is a correct pair of abbreviations for an amino acid?

The net charge on the amino acid cys in a solution at pH 7 is closest to

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

Which groups of a pair of amino acids must react to form a peptide bond?

Exhibit 3A (for this chapter) Refer to Exhibit 3A.Which of these amino acids could act as a good buffer at pH = 4.5

This amino acid displays a free amino group in the peptide ALA-GLN-ARG-SER-HIS:

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

Which amino acid takes on a positive charge when the R-group gains a proton?

Which of the following is not considered an uncommon amino acid?

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

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: 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

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