Question 1

Chiral objects

Accepted Answer

A)  are cyclic compounds in the chair form. 
B)  are not superimposable on their mirror images. 
C)  never occur in nature. 
D)  do not form crystals. 
A)  are cyclic compounds in the chair form. 
B)  are not superimposable on their mirror images. 
C)  never occur in nature. 
D)  do not form crystals. B

Question 2

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 B

Question 3

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 A

Question 4

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 5

The side chain of Met is a poor hydrogen bond donor.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following types of amino acids has uncharged side chains at neutral pH?

Accepted Answer

A)  Nonpolar amino acids 
B)  Acidic amino acids 
C)  Polar-neutral amino acids 
D)  Basic amino acids 
A)  Nonpolar amino acids 
B)  Acidic amino acids 
C)  Polar-neutral amino acids 
D)  Basic amino acids

Question 7

What is the charge on the tetrapeptide lys-lys-his-glu at pH 7?

Accepted Answer

A)  0 
B)  +1 
C)  +2 
D)  − 1 
A)  0 
B)  +1 
C)  +2 
D)  − 1

Question 8

Which amino acid has the three-letter symbol asn?

Accepted Answer

A)  aspartic acid 
B)  asparagine 
C)  alanine 
D)  arginine 
A)  aspartic acid 
B)  asparagine 
C)  alanine 
D)  arginine

Question 9

Exhibit 3A (for this chapter)   Refer to Exhibit 3A. Which one has a pI of 5.0?

Accepted Answer

A)  Alanine 
B)  Arginine 
C)  Histidine 
D)  Cysteine 
E)  Glutamic acid 
A)  Alanine 
B)  Arginine 
C)  Histidine 
D)  Cysteine 
E)  Glutamic acid

Question 10

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 11

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 12

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 13

The side chain groups of amino acids are bonded to which carbon?

Accepted Answer

A)  The α -carbon. 
B)  The β -carbon. 
C)  The carbonyl carbon. 
D)  Different amino acids have their side chains attached to different carbons. 
A)  The α -carbon. 
B)  The β -carbon. 
C)  The carbonyl carbon. 
D)  Different amino acids have their side chains attached to different carbons.

Question 14

Thr and Ser both have hydroxyls as side chains.

Accepted Answer

A) True 
 B)False

Question 15

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 16

Exhibit 3A (for this chapter)   Refer to Exhibit 3A. The pI of an amino acid is the pH at which it has a zero net charge. What is the increasing order of isoelectric points (low pH to high) for these three amino acids?

Accepted Answer

A)  ALA, HIS, ASP 
B)  ASP, ALA, HIS 
C)  HIS, ALA, ASP 
D)  ALA, ASL, HIS 
E)  ASP, HIS, ALA 
A)  ALA, HIS, ASP 
B)  ASP, ALA, HIS 
C)  HIS, ALA, ASP 
D)  ALA, ASL, HIS 
E)  ASP, HIS, ALA

Question 17

The order in which amino acids are linked in peptides is given

Accepted Answer

A)  from the C-terminal to the N-terminal end 
B)  from the N-terminal to the C-terminal end 
C)  in alphabetical order 
D)  in order of increasing molecular weights of the amino acid residues 
A)  from the C-terminal to the N-terminal end 
B)  from the N-terminal to the C-terminal end 
C)  in alphabetical order 
D)  in order of increasing molecular weights of the amino acid residues

Question 18

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 19

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 20

What do amino acids such as alanine, leucine, isoleucine, tryptophan, and valine have in common?

Accepted Answer

A)  They all are polar-neutral amino acids. 
B)  They all are nonpolar amino acids. 
C)  They all are acidic amino acids. 
D)  They all are basic amino acids. 
A)  They all are polar-neutral amino acids. 
B)  They all are nonpolar amino acids. 
C)  They all are acidic amino acids. 
D)  They all are basic amino acids.

Exam 3: Amino Acids and Peptides

Chiral objects

Which amino acid is classified as polar?

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?

The side chain of Met is a poor hydrogen bond donor.

Which of the following types of amino acids has uncharged side chains at neutral pH?

What is the charge on the tetrapeptide lys-lys-his-glu at pH 7?

Which amino acid has the three-letter symbol asn?

Exhibit 3A (for this chapter) Refer to Exhibit 3A. Which one has a pI of 5.0?

Which amino acid has a basic R group?

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

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

The side chain groups of amino acids are bonded to which carbon?

Thr and Ser both have hydroxyls as side chains.

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

Exhibit 3A (for this chapter) Refer to Exhibit 3A. The pI of an amino acid is the pH at which it has a zero net charge. What is the increasing order of isoelectric points (low pH to high) for these three amino acids?

The order in which amino acids are linked in peptides is given

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

Which amino acid has the one-letter symbol E?

What do amino acids such as alanine, leucine, isoleucine, tryptophan, and valine have in common?

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

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