Question 1

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

Accepted Answer

A)  glutamate and cysteine 
B)  aspartate and glycine 
C)  glutamate and lysine 
D)  aspartate and glutamate 
A)  glutamate and cysteine 
B)  aspartate and glycine 
C)  glutamate and lysine 
D)  aspartate and glutamate

Question 2

Which statement is true about the classification of amino acids?

Accepted Answer

A)  Alanine and valine are basic amino acids. 
B)  Lysine and arginine are acidic amino acids. 
C)  Glutamic acid and asparagine are hydrophobic amino acids. 
D)  Tryptophan and phenylalanine are aromatic amino acids. 
E)  Methionine and cysteine are hydroxyl-containing amino acids. 
A)  Alanine and valine are basic amino acids. 
B)  Lysine and arginine are acidic amino acids. 
C)  Glutamic acid and asparagine are hydrophobic amino acids. 
D)  Tryptophan and phenylalanine are aromatic amino acids. 
E)  Methionine and cysteine are hydroxyl-containing amino acids.

Question 3

Which is the C-terminal amino acid in the peptide ALA-GLN-ARG-SER-HIS?

Accepted Answer

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

Question 4

Exhibit 3A (for this chapter)   Refer to Exhibit 3A.Calculate the pI of CYS?

Accepted Answer

A)  1.7 
B)  5.0 
C)  8.3 
D)  9.6 
E)  10.8 
A)  1.7 
B)  5.0 
C)  8.3 
D)  9.6 
E)  10.8

Question 5

Which of the following can be considered a unique characteristic of histidine?

Accepted Answer

A)  Its side chain is attached to the alpha carbon 
B)  It has a basic side chain 
C)  It has a side chain that is chemically basic but has an acidic pKa 
D)  It is technically an "imino" acid 
A)  Its side chain is attached to the alpha carbon 
B)  It has a basic side chain 
C)  It has a side chain that is chemically basic but has an acidic pKa 
D)  It is technically an "imino" acid

Question 6

Which amino acid occurs only in the protein thyroglobulin?

Accepted Answer

A)  tryptophan 
B)  methionine 
C)  arginine 
D)  thyroxine 
A)  tryptophan 
B)  methionine 
C)  arginine 
D)  thyroxine

Question 7

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 8

The amino and carboxyl groups of amino acids are bonded to which carbon?

Accepted Answer

A)  Both are bonded to the a-carbon. 
B)  Both are bonded to the b-carbon. 
C)  The amino is bonded to the a-carbon, and the carboxyl is bonded to the b-carbon. 
D)  The amino is bonded to the b-carbon, and the carboxyl is bonded to the a-carbon. 
A)  Both are bonded to the a-carbon. 
B)  Both are bonded to the b-carbon. 
C)  The amino is bonded to the a-carbon, and the carboxyl is bonded to the b-carbon. 
D)  The amino is bonded to the b-carbon, and the carboxyl is bonded to the a-carbon.

Question 9

How many possible tetrapeptides can be made using all four of the amino acids D,W,F,and R?

Accepted Answer

A)  4 
B)  6 
C)  12 
D)  24 
A)  4 
B)  6 
C)  12 
D)  24

Question 10

Which amino acid is classified as polar?

Accepted Answer

A)  L 
B)  H 
C)  P 
D)  I 
A)  L 
B)  H 
C)  P 
D)  I

Question 11

The pKa values of the alpha carboxyl groups of common amino acids are around

Accepted Answer

A)  pH 2 
B)  pH 5 
C)  pH 7 
D)  pH 9 
A)  pH 2 
B)  pH 5 
C)  pH 7 
D)  pH 9

Question 12

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 13

Which type of reaction is not important in the creation and regulation of neurotransmitters?

Accepted Answer

A)  Decarboxylases 
B)  Hydroxylases 
C)  Monoamine Oxidases 
D)  Peptidases 
E)  All of these are important in the metabolism of neurotransmitters. 
A)  Decarboxylases 
B)  Hydroxylases 
C)  Monoamine Oxidases 
D)  Peptidases 
E)  All of these are important in the metabolism of neurotransmitters.

Question 14

Which amino acid has the one-letter symbol E?

Accepted Answer

A)  lysine 
B)  phenylalanine 
C)  histidine 
D)  glutamic acid 
A)  lysine 
B)  phenylalanine 
C)  histidine 
D)  glutamic acid

Question 15

Which amino acid has a basic 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 16

At its isolectric pH,glycine will have

Accepted Answer

A)  both of its ionizable functional groups dissociated. 
B)  neither of its ionizable functional groups dissociated. 
C)  only its carboxyl group dissociated. 
D)  only its amino group dissociated. 
A)  both of its ionizable functional groups dissociated. 
B)  neither of its ionizable functional groups dissociated. 
C)  only its carboxyl group dissociated. 
D)  only its amino group dissociated.

Question 17

Which amino acid would likely be least water-soluble at pH 7.0

Accepted Answer

A)  Histidine 
B)  Isoleucine 
C)  Isoleucine or Tyrosine, you cannot tell 
D)  Serine 
E)  Tyrosine 
A)  Histidine 
B)  Isoleucine 
C)  Isoleucine or Tyrosine, you cannot tell 
D)  Serine 
E)  Tyrosine

Exam 3: Amino Acids and Peptides

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

Which statement is true about the classification of amino acids?

Which is the C-terminal amino acid in the peptide ALA-GLN-ARG-SER-HIS?

Exhibit 3A (for this chapter) Refer to Exhibit 3A.Calculate the pI of CYS?

Which of the following can be considered a unique characteristic of histidine?

Which amino acid occurs only in the protein thyroglobulin?

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

The amino and carboxyl groups of amino acids are bonded to which carbon?

How many possible tetrapeptides can be made using all four of the amino acids D,W,F,and R?

Which amino acid is classified as polar?

The pKa values of the alpha carboxyl groups of common amino acids are around

Which amino acid has a benzene-like ring?

Which type of reaction is not important in the creation and regulation of neurotransmitters?

Which amino acid has the one-letter symbol E?

Which amino acid has a basic R group?

At its isolectric pH,glycine will have

Which amino acid would likely be least water-soluble at pH 7.0

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

Filters

The pK_avalues of the alpha carboxyl groups of common amino acids are around