Question 1

Which of the following amino acids has the highest pI?

Accepted Answer

A)  arginine 
B)  cysteine 
C)  glycine 
D)  glutamic acid 
A)  arginine 
B)  cysteine 
C)  glycine 
D)  glutamic acid

Question 2

Which of the following statements is true of the structure of myoglobin?

Accepted Answer

A)  It is a fibrous protein molecule. 
B)  It consists of two polypeptide chains of 175 amino acids. 
C)  It has a prosthetic group called the heme group. 
D)  It has eight β-pleated sheet regions. 
A)  It is a fibrous protein molecule. 
B)  It consists of two polypeptide chains of 175 amino acids. 
C)  It has a prosthetic group called the heme group. 
D)  It has eight β-pleated sheet regions.

Question 3

How many essential amino acids have basic side chains?

Accepted Answer

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

Question 4

In the tertiary structure of proteins, which amino acid is involved in the formation of covalent bonds?

Accepted Answer

A)  alanine 
B)  aspartic acid 
C)  cysteine 
D)  tryptophan 
A)  alanine 
B)  aspartic acid 
C)  cysteine 
D)  tryptophan

Question 5

Which of the following proteins is associated with the storage of iron?

Accepted Answer

A)  actin 
B)  ferritin 
C)  hemoglobin 
D)  insulin 
A)  actin 
B)  ferritin 
C)  hemoglobin 
D)  insulin

Question 6

Which of the following is true of protein secondary structures?

Accepted Answer

A)  They are the linear sequences of amino acids. 
B)  They are the repetitive conformations of the protein backbone. 
C)  They are held together by strong van der Waals forces of attraction. 
D)  They include parallelly arranged β-pleated sheets only. 
A)  They are the linear sequences of amino acids. 
B)  They are the repetitive conformations of the protein backbone. 
C)  They are held together by strong van der Waals forces of attraction. 
D)  They include parallelly arranged β-pleated sheets only.

Question 7

How are the dipeptides Ala-Gly and Gly-Ala related to each other?

Accepted Answer

A)  They are the same compound. 
B)  They have the same properties. 
C)  They are constitutional isomers. 
D)  They are mirror images. 
A)  They are the same compound. 
B)  They have the same properties. 
C)  They are constitutional isomers. 
D)  They are mirror images.

Question 8

Which of the following proteins can assist in blood clotting?

Accepted Answer

A)  insulin 
B)  erythropoietin 
C)  fibrinogen 
D)  ferritin 
A)  insulin 
B)  erythropoietin 
C)  fibrinogen 
D)  ferritin

Question 9

Which of the following pair of amino acids has basic side chains?

Accepted Answer

A)  cysteine and glycine 
B)  cysteine and methionine 
C)  histidine and lysine 
D)  phenylalanine and tryptophan 
A)  cysteine and glycine 
B)  cysteine and methionine 
C)  histidine and lysine 
D)  phenylalanine and tryptophan

Question 10

Besides oxygen, which of the following gases can bind to the heme group of hemoglobin?

Accepted Answer

A)  sulfur dioxide 
B)  chlorine 
C)  carbon monoxide 
D)  argon 
A)  sulfur dioxide 
B)  chlorine 
C)  carbon monoxide 
D)  argon

Question 11

Which of the following pair of amino acids develops hydrophobic interactions?

Accepted Answer

A)  alanine and glutamic acid 
B)  aspartic acid and lysine 
C)  leucine and phenylalanine 
D)  serine and tyrosine 
A)  alanine and glutamic acid 
B)  aspartic acid and lysine 
C)  leucine and phenylalanine 
D)  serine and tyrosine

Question 12

Which of the following is true of an amino acid at a pH above its isoelectric point?

Accepted Answer

A)  It will have a negative charge. 
B)  It will be electrically neutral. 
C)  It will have a positive charge. 
D)  It is impossible to predict the charge of an amino acid. 
A)  It will have a negative charge. 
B)  It will be electrically neutral. 
C)  It will have a positive charge. 
D)  It is impossible to predict the charge of an amino acid.

Question 13

Which level of a protein structure is not affected by denaturation?

Accepted Answer

A)  primary 
B)  secondary 
C)  tertiary 
D)  quaternary 
A)  primary 
B)  secondary 
C)  tertiary 
D)  quaternary

Question 14

Which of the following amino acids is not found in collagen?

Accepted Answer

A)  glycine 
B)  hydroxyproline 
C)  proline 
D)  None, they are all found in collagen. 
A)  glycine 
B)  hydroxyproline 
C)  proline 
D)  None, they are all found in collagen.

Question 15

Which of the following is a function of proteins?

Accepted Answer

A)  catalysis 
B)  movement 
C)  storage 
D)  all of these 
A)  catalysis 
B)  movement 
C)  storage 
D)  all of these

Question 16

What is a residue?

Accepted Answer

A)  An amino acid that has been severed from a protein 
B)  Any individual amino acid in a protein or a polypeptide 
C)  The portion of a protein that remains after one amino acid has been removed from its C-terminus 
D)  The portion of a protein that remains after one amino acid has been removed from its N-terminus 
A)  An amino acid that has been severed from a protein 
B)  Any individual amino acid in a protein or a polypeptide 
C)  The portion of a protein that remains after one amino acid has been removed from its C-terminus 
D)  The portion of a protein that remains after one amino acid has been removed from its N-terminus

Question 17

Identify the disease that is caused by conformational change in the α-helical content of the normal prion protein.

Accepted Answer

A)  Mad cow disease 
B)  Scrapie disease 
C)  Creutzfeld-Jakob disease 
D)  All of these 
A)  Mad cow disease 
B)  Scrapie disease 
C)  Creutzfeld-Jakob disease 
D)  All of these

Question 18

Which of the following is true of an amino acid at a pH below its isoelectric point?

Accepted Answer

A)  It will have a negative charge. 
B)  It will be electrically neutral. 
C)  It will have a positive charge. 
D)  It is impossible to predict the charge of an amino acid. 
A)  It will have a negative charge. 
B)  It will be electrically neutral. 
C)  It will have a positive charge. 
D)  It is impossible to predict the charge of an amino acid.

Question 19

How many essential amino acids have acidic side chains?

Accepted Answer

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

Question 20

Which of the following defines the tertiary structure of proteins?

Accepted Answer

A)  It is the sequence of amino acid in proteins. 
B)  It refers to the repetitive conformations of the protein backbone. 
C)  It is the overall 3-D conformation of a polypeptide chain and the interactions of the side chains. 
D)  It is the interaction between the subunits of a protein that has more than one polypeptide chain. 
A)  It is the sequence of amino acid in proteins. 
B)  It refers to the repetitive conformations of the protein backbone. 
C)  It is the overall 3-D conformation of a polypeptide chain and the interactions of the side chains. 
D)  It is the interaction between the subunits of a protein that has more than one polypeptide chain.

Exam 21: Proteins

Which of the following amino acids has the highest pI?

Which of the following statements is true of the structure of myoglobin?

How many essential amino acids have basic side chains?

In the tertiary structure of proteins, which amino acid is involved in the formation of covalent bonds?

Which of the following proteins is associated with the storage of iron?

Which of the following is true of protein secondary structures?

How are the dipeptides Ala-Gly and Gly-Ala related to each other?

Which of the following proteins can assist in blood clotting?

Which of the following pair of amino acids has basic side chains?

Besides oxygen, which of the following gases can bind to the heme group of hemoglobin?

Which of the following pair of amino acids develops hydrophobic interactions?

Which of the following is true of an amino acid at a pH above its isoelectric point?

Which level of a protein structure is not affected by denaturation?

Which of the following amino acids is not found in collagen?

Which of the following is a function of proteins?

What is a residue?

Identify the disease that is caused by conformational change in the α-helical content of the normal prion protein.

Which of the following is true of an amino acid at a pH below its isoelectric point?

How many essential amino acids have acidic side chains?

Which of the following defines the tertiary structure of proteins?

Matter, Energy, and Measurement

Atoms

Chemical Bonds

Chemical Reactions

Gases, Liquids, and Solids

Solutions and Colloids

Reaction Rates and Chemical Equilibrium

Acids and Bases

Nuclear Chemistry

Organic Chemistry

Alkanes

Alkenes, Alkynes, and Aromatic Compounds

Alcohols, Ethers, and Thiols

Chirality: the Handedness of Molecules

Amines

Aldehydes and Ketones

Carboxylic Acids

Carboxylic Anhydrides, Esters, and Amides

Carbohydrates

Lipids

Enzymes

Chemical Communications: Neurotransmitters and Hormones

Nucleotides, Nucleic Acids, and Heredity

Gene Expression and Protein Synthesis

Bioenergetics: How the Body Converts Food to Energy

Specific Catabolic Pathways: Carbohydrate, Lipid, and Protein Metabolism

Biosynthetic Pathways

Nutrition

Immunochemistry

Body Fluids

Filters