Question 1

Compared to a protein molecule that has no electrical charge,a negatively charged protein will be less soluble in water.

Accepted Answer

A) True 
 B)False  False

Question 2

Protein digestion begins in the small intestine through the action of the enzyme pepsin.

Accepted Answer

A) True 
 B)False  False

Question 3

Condensation of a molecule of glycine with one of valine can produce two possible dipeptide molecules.

Accepted Answer

A) True 
 B)False  True

Question 4

What term is used to describe the amino acid that has the free carboxylate group in a peptide?

Accepted Answer

A) acid end 
B) C' group 
C) C-terminal amino acid 
D) primary amino acid 
E) tertiary amino acid 
A) acid end 
B) C' group 
C) C-terminal amino acid 
D) primary amino acid 
E) tertiary amino acid

Question 5

Which of the following statements concerning sickle cell anemia is FALSE?

Accepted Answer

A) Individuals with sickle cell anemia produce a mutant hemoglobin called sickle cell hemoglobin,so called due to the sickled appearance of the red blood cells that form in this condition. 
B) Sickle cell hemoglobin differs from normal hemoglobin by only one amino acid residue. 
C) Individuals who suffer from sickle cell anemia inherited two genes for sickle cell hemoglobin,one from each parent. 
D) Individuals with sickle cell trait have inherited only one copy of the gene for sickle cell hemoglobin and one for normal hemoglobin. 
E) The presence of sickle cell trait is related to an increase in resistance to diabetes. 
A) Individuals with sickle cell anemia produce a mutant hemoglobin called sickle cell hemoglobin,so called due to the sickled appearance of the red blood cells that form in this condition. 
B) Sickle cell hemoglobin differs from normal hemoglobin by only one amino acid residue. 
C) Individuals who suffer from sickle cell anemia inherited two genes for sickle cell hemoglobin,one from each parent. 
D) Individuals with sickle cell trait have inherited only one copy of the gene for sickle cell hemoglobin and one for normal hemoglobin. 
E) The presence of sickle cell trait is related to an increase in resistance to diabetes.

Question 6

When a protein undergoes hydrolysis,which of the following things occur?

Accepted Answer

A) Peptide bonds are broken,and individual amino acids are released. 
B) The protein folds into its functional,three-dimensional shape. 
C) Water adds across each double bond that is present to give an alcohol. 
D) New amino acids are joined to the growing protein chain. 
E) Unsaturation in the side chain R groups is removed. 
A) Peptide bonds are broken,and individual amino acids are released. 
B) The protein folds into its functional,three-dimensional shape. 
C) Water adds across each double bond that is present to give an alcohol. 
D) New amino acids are joined to the growing protein chain. 
E) Unsaturation in the side chain R groups is removed.

Question 7

What protein is an oxygen transport protein found in red blood cells?

Accepted Answer

A) transferrin 
B) collagen 
C) fibrinogen 
D) hemoglobin 
E) myoglobin 
A) transferrin 
B) collagen 
C) fibrinogen 
D) hemoglobin 
E) myoglobin

Question 8

Amino acids or their component elements are NOT necessary for the biosynthesis of which of the following?

Accepted Answer

A) new cellular proteins 
B) the bases in DNA 
C) hemoglobin 
D) glycogen 
E) myoglobin 
A) new cellular proteins 
B) the bases in DNA 
C) hemoglobin 
D) glycogen 
E) myoglobin

Question 9

What is meant by the "tertiary structure" of a protein?

Accepted Answer

A) It refers to the peptide bonds that join the amino acids together in the protein chain. 
B) It describes the unique sequence of amino acids in the protein chain. 
C) It describes the regular,repeating structures found in the protein chain. 
D) It describes the overall three dimensional shape of a protein. 
E) It describes the association of two or more polypeptide chains to form one functioning protein unit. 
A) It refers to the peptide bonds that join the amino acids together in the protein chain. 
B) It describes the unique sequence of amino acids in the protein chain. 
C) It describes the regular,repeating structures found in the protein chain. 
D) It describes the overall three dimensional shape of a protein. 
E) It describes the association of two or more polypeptide chains to form one functioning protein unit.

Question 10

Which of the following is FALSE concerning the denaturing of proteins?

Accepted Answer

A) Heavy metals can denature proteins by forming bonds with negatively charged side chains. 
B) Denaturing can occur by changing the pH. 
C) Detergents,organic solvents,and heat break apart hydrogen bonding within proteins. 
D) Denaturing breaks the weaker hydrogen bonding,which creates the secondary and tertiary folds. 
E) Denaturing breaks apart the amino acids that make up the protein. 
A) Heavy metals can denature proteins by forming bonds with negatively charged side chains. 
B) Denaturing can occur by changing the pH. 
C) Detergents,organic solvents,and heat break apart hydrogen bonding within proteins. 
D) Denaturing breaks the weaker hydrogen bonding,which creates the secondary and tertiary folds. 
E) Denaturing breaks apart the amino acids that make up the protein.

Question 11

Hemoglobin and glycoproteins are two examples of proteins that contain a prosthetic group.What is a prosthetic group?

Accepted Answer

A) a nonprotein group bonded to a protein to create a functional unit 
B) an inhibitor of the function of the protein 
C) an enzyme that allows the protein to function more efficiently 
D) a side chain amino acid that is not one of the 20 standard amino acids 
E) an artificial amino acid that has been synthesized in the laboratory 
A) a nonprotein group bonded to a protein to create a functional unit 
B) an inhibitor of the function of the protein 
C) an enzyme that allows the protein to function more efficiently 
D) a side chain amino acid that is not one of the 20 standard amino acids 
E) an artificial amino acid that has been synthesized in the laboratory

Question 12

Tuftsin is a tetrapeptide that stimulates and promotes the destruction of tumor cells.What is meant by the term tetrapeptide?

Accepted Answer

A) There are four separate peptide chains in its structure. 
B) Four peptide bonds join the amino acid together in its structure. 
C) Four amino acids are present,joined together by peptide bonds. 
D) Four different secondary structures are present. 
E) This protein has a quaternary level of structure. 
A) There are four separate peptide chains in its structure. 
B) Four peptide bonds join the amino acid together in its structure. 
C) Four amino acids are present,joined together by peptide bonds. 
D) Four different secondary structures are present. 
E) This protein has a quaternary level of structure.

Question 13

Which of the following properly represents the dipeptide with the primary structure Ala-Cys?

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E) 
  
A) 
  
B) 
  
C) 
  
D) 
  
E)

Question 14

Which of the following correctly matches the amino acid with its three-letter abbreviation?

Accepted Answer

A) tryptophan: try 
B) asparagine: asp 
C) cysteine: cys 
D) isoleucine: iso 
E) valine: van 
A) tryptophan: try 
B) asparagine: asp 
C) cysteine: cys 
D) isoleucine: iso 
E) valine: van

Question 15

What is the most common type of secondary structure in a protein?

Accepted Answer

A) random coil 
B) β-pleated sheet 
C) double helix 
D) α-helix 
E) globular 
A) random coil 
B) β-pleated sheet 
C) double helix 
D) α-helix 
E) globular

Question 16

Which amino acid contains an aromatic ring in its side chain?

Accepted Answer

A) alanine 
B) glycine 
C) isoleucine 
D) tyrosine 
E) threonine 
A) alanine 
B) glycine 
C) isoleucine 
D) tyrosine 
E) threonine

Question 17

What level of protein structure is described by the binding of several peptides to produce a functional protein?

Accepted Answer

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

Question 18

What disease results from a deficiency of vitamin C?

Accepted Answer

A) diabetes 
B) sickle cell 
C) scurvy 
D) Alzheimer's 
E) lactose intolerance 
A) diabetes 
B) sickle cell 
C) scurvy 
D) Alzheimer's 
E) lactose intolerance

Question 19

What changes occur in the structure of a protein molecule when it becomes denatured?

Accepted Answer

A) change in primary structure 
B) change in secondary structure 
C) change in tertiary structure 
D) All of the choices are correct. 
E) There is a change in both the secondary and tertiary structures. 
A) change in primary structure 
B) change in secondary structure 
C) change in tertiary structure 
D) All of the choices are correct. 
E) There is a change in both the secondary and tertiary structures.

Question 20

What determines the primary structure of a protein?

Accepted Answer

A) α-helix 
B) hydrogen bonding between amide hydrogens and carboxyl oxygens 
C) amino acid sequence of the chain 
D) ionic bonds between the R group of oppositely charged amino acids 
E) None of the choices are correct. 
A) α-helix 
B) hydrogen bonding between amide hydrogens and carboxyl oxygens 
C) amino acid sequence of the chain 
D) ionic bonds between the R group of oppositely charged amino acids 
E) None of the choices are correct.

Exam 18: Protein Structure and Function

Compared to a protein molecule that has no electrical charge,a negatively charged protein will be less soluble in water.

Protein digestion begins in the small intestine through the action of the enzyme pepsin.

Condensation of a molecule of glycine with one of valine can produce two possible dipeptide molecules.

What term is used to describe the amino acid that has the free carboxylate group in a peptide?

Which of the following statements concerning sickle cell anemia is FALSE?

When a protein undergoes hydrolysis,which of the following things occur?

What protein is an oxygen transport protein found in red blood cells?

Amino acids or their component elements are NOT necessary for the biosynthesis of which of the following?

What is meant by the "tertiary structure" of a protein?

Which of the following is FALSE concerning the denaturing of proteins?

Hemoglobin and glycoproteins are two examples of proteins that contain a prosthetic group.What is a prosthetic group?

Tuftsin is a tetrapeptide that stimulates and promotes the destruction of tumor cells.What is meant by the term tetrapeptide?

Which of the following properly represents the dipeptide with the primary structure Ala-Cys?

Which of the following correctly matches the amino acid with its three-letter abbreviation?

What is the most common type of secondary structure in a protein?

Which amino acid contains an aromatic ring in its side chain?

What level of protein structure is described by the binding of several peptides to produce a functional protein?

What disease results from a deficiency of vitamin C?

What changes occur in the structure of a protein molecule when it becomes denatured?

What determines the primary structure of a protein?

Chemistry - Methods and Measurement

The Structure of the Atom and the Periodic Table

Structure and Properties of Ionic and Covalent Compounds

Calculations, chemical Changes, and the Chemical Equation

States of Matter: Gases, liquids, and Solids

Solutions

Energy,rate and Equilibrium

Acids and Bases

The Nucleus, radioactivity, and Nuclear Medicine

An Introduction to Organic Chemistry

The Unsaturated Hydrocarbons: Alkenes, alkynes, and Aromatics

Alcohols, phenols, thiols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Carboxylic Acid Derivatives

Amines and Amides

Carbohydrates

Lipids and Their Functions in Biochemical Systems

Enzymes

Introduction to Molecular Genetics

Carbohydrate Metabolism

Aerobic Respiration and Energy Production

Fatty Acid Metabolism

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