Question 1

Which statement about noncompetitive inhibitors is FALSE?

Accepted Answer

A)  Noncompetitive inhibitors are sometimes involved in feedback inhibition. 
B)  Noncompetitive inhibitors can serve a regulatory role in the body. 
C)  Noncompetitive inhibitors do not bind to the active site of an enzyme. 
D)  Increasing the concentration of a substrate restores function of an enzyme in the presence of a noncompetitive inhibitor. 
E)  Binding of a noncompetitive inhibitor results in deformation of an enzyme's active site. 
A)  Noncompetitive inhibitors are sometimes involved in feedback inhibition. 
B)  Noncompetitive inhibitors can serve a regulatory role in the body. 
C)  Noncompetitive inhibitors do not bind to the active site of an enzyme. 
D)  Increasing the concentration of a substrate restores function of an enzyme in the presence of a noncompetitive inhibitor. 
E)  Binding of a noncompetitive inhibitor results in deformation of an enzyme's active site.

Question 2

Which of the following types of interactions result in proteins folding so that nonpolar residues are on the interior of the protein, protected from water?

Accepted Answer

A)  hydrogen bonds 
B)  salt bridges 
C)  disulfide bonds 
D)  hydrophilic interactions 
E)  dispersion forces 
A)  hydrogen bonds 
B)  salt bridges 
C)  disulfide bonds 
D)  hydrophilic interactions 
E)  dispersion forces

Question 3

Which structure illustrates an amino acid as a zwitterion?

Accepted Answer

A)  structure a 
B)  structure b 
C)  structure c 
D)  structure d 
E)  structure e 
A)  structure a 
B)  structure b 
C)  structure c 
D)  structure d 
E)  structure e

Question 4

Sickle-cell anemia is caused by

Accepted Answer

A)  an abnormal form of acetylcholine. 
B)  an abnormal form of iron. 
C)  too little iron. 
D)  an abnormal form of hemoglobin. 
E)  Actually, the cause of this disease is unknown. 
A)  an abnormal form of acetylcholine. 
B)  an abnormal form of iron. 
C)  too little iron. 
D)  an abnormal form of hemoglobin. 
E)  Actually, the cause of this disease is unknown.

Question 5

Which structure illustrates an amino acid in a solution with a high pH?

Accepted Answer

A)  structure a 
B)  structure b 
C)  structure c 
D)  structure d 
E)  structure e 
A)  structure a 
B)  structure b 
C)  structure c 
D)  structure d 
E)  structure e

Question 6

Which of the following choices is NOT a problem associated with sickle-cell anemia?

Accepted Answer

A)  People with sickle-cell anemia are prone to severe headaches. 
B)  People with sickle-cell anemia are prone to episodes of infection. 
C)  Organs can be damaged because of sickled red blood cells. 
D)  Sickle-cell anemia can cause anemia. 
E)  The sickle cells can aggregate and clog blood vessels. 
A)  People with sickle-cell anemia are prone to severe headaches. 
B)  People with sickle-cell anemia are prone to episodes of infection. 
C)  Organs can be damaged because of sickled red blood cells. 
D)  Sickle-cell anemia can cause anemia. 
E)  The sickle cells can aggregate and clog blood vessels.

Question 7

Which of the amino acids in the following structure are at the N-terminus?

Accepted Answer

A)  All of them at the N-terminus. 
B)  I only 
C)  III only 
D)  II and III 
E)  I and III 
A)  All of them at the N-terminus. 
B)  I only 
C)  III only 
D)  II and III 
E)  I and III

Question 8

What type of secondary structure is in blue in the following protein?

Accepted Answer

A)  an α-helix 
B)  a parallel β-pleated sheet 
C)  an antiparallel β-pleated sheet 
D)  a random coil 
E)  This illustration does not show secondary structure. 
A)  an α-helix 
B)  a parallel β-pleated sheet 
C)  an antiparallel β-pleated sheet 
D)  a random coil 
E)  This illustration does not show secondary structure.

Question 9

Which of the following is the proper amino acid chain designator of the peptide below?   I.Val-Ser-Ala II.Ser-Ala-Val
III)Ala-Ser-Val

Accepted Answer

A)  All of these represent the same molecule. 
B)  I and III 
C)  I only 
D)  II only 
E)  III only 
A)  All of these represent the same molecule. 
B)  I and III 
C)  I only 
D)  II only 
E)  III only

Question 10

Is the peptide shown below chiral?

Accepted Answer

A)  No, molecules with multiple chiral centers are not chiral. 
B)  Yes, it has chiral centers. 
C)  No, it has no chiral centers. 
D)  Yes, it has no chiral centers. 
E)  It is not possible to determine whether or not the peptide is chiral. 
A)  No, molecules with multiple chiral centers are not chiral. 
B)  Yes, it has chiral centers. 
C)  No, it has no chiral centers. 
D)  Yes, it has no chiral centers. 
E)  It is not possible to determine whether or not the peptide is chiral.

Question 11

What types of biomolecules are enzymes?

Accepted Answer

A)  only proteins 
B)  only DNA molecules 
C)  proteins and some carbohydrates 
D)  proteins and some RNA molecules 
E)  carbohydrates and some RNA molecules 
A)  only proteins 
B)  only DNA molecules 
C)  proteins and some carbohydrates 
D)  proteins and some RNA molecules 
E)  carbohydrates and some RNA molecules

Question 12

Which of the following is NOT one of the four categories of biomolecules?

Accepted Answer

A)  proteins 
B)  vitamins 
C)  lipids 
D)  carbohydrates 
E)  nucleic acids 
A)  proteins 
B)  vitamins 
C)  lipids 
D)  carbohydrates 
E)  nucleic acids

Question 13

What is the molecular shape of the carbon with the asterisk next to it?

Accepted Answer

A)  linear 
B)  bent 
C)  trigonal planar 
D)  tetrahedral 
E)  pyramidal 
A)  linear 
B)  bent 
C)  trigonal planar 
D)  tetrahedral 
E)  pyramidal

Question 14

An enzyme inhibitor is a compound that

Accepted Answer

A)  prevents a substrate from binding to the enzyme. 
B)  deforms enzymes. 
C)  binds to the active site of an enzyme. 
D)  prevents an enzyme from functioning. 
E)  can do all of the above. 
A)  prevents a substrate from binding to the enzyme. 
B)  deforms enzymes. 
C)  binds to the active site of an enzyme. 
D)  prevents an enzyme from functioning. 
E)  can do all of the above.

Question 15

Which statement about quaternary structure is TRUE?

Accepted Answer

A)  Quaternary structure is the position of subunits in the overall structure of a protein. 
B)  All proteins have quaternary structure. 
C)  Quaternary structure is unaffected by acids or heat. 
D)  Quaternary structure is determined by the same interaction that holds an α-helix together. 
E)  Quaternary structure is how prosthetic groups are held in a protein. 
A)  Quaternary structure is the position of subunits in the overall structure of a protein. 
B)  All proteins have quaternary structure. 
C)  Quaternary structure is unaffected by acids or heat. 
D)  Quaternary structure is determined by the same interaction that holds an α-helix together. 
E)  Quaternary structure is how prosthetic groups are held in a protein.

Question 16

Aspartic acid has a side chain that contains a carboxylic acid.At physiological pH, what is the structure of aspartic acid?

Accepted Answer

A)  structure a 
B)  structure b 
C)  structure c 
D)  structure d 
E)  structure e 
A)  structure a 
B)  structure b 
C)  structure c 
D)  structure d 
E)  structure e

Question 17

How does your body know which proteins to make and in what order to place the amino acids when the proteins are synthesized?

Accepted Answer

A)  The body does not make proteins; they are consumed in the diet. 
B)  There are special proteins in which this information is encoded. 
C)  Our DNA acts as a blueprint for proteins. 
D)  Our brain does this subconsciously. 
E)  The answer is not known to science. 
A)  The body does not make proteins; they are consumed in the diet. 
B)  There are special proteins in which this information is encoded. 
C)  Our DNA acts as a blueprint for proteins. 
D)  Our brain does this subconsciously. 
E)  The answer is not known to science.

Question 18

Which interaction holds the α-helix and the β-pleated sheet into its unique folding pattern?

Accepted Answer

A)  covalent bonding between cysteines (-CH2SH) 
B)  hydrogen bonding between serines (-CH2OH) 
C)  hydrogen bonding between nitrogens and oxygens in the polypeptide backbone 
D)  ionic bonding between acidic and basic amino acid side chains 
E)  hydrophilic interactions 
A)  covalent bonding between cysteines (-CH2SH) 
B)  hydrogen bonding between serines (-CH2OH) 
C)  hydrogen bonding between nitrogens and oxygens in the polypeptide backbone 
D)  ionic bonding between acidic and basic amino acid side chains 
E)  hydrophilic interactions

Question 19

At low pH, the amino acid zwitterion reacts with hydronium (H3O+).What is the product of this acid-base reaction?

Accepted Answer

A)  structure a 
B)  structure b 
C)  structure c 
D)  structure d 
E)  structure e 
A)  structure a 
B)  structure b 
C)  structure c 
D)  structure d 
E)  structure e

Question 20

Which statement about disulfide bridges is FALSE?

Accepted Answer

A)  Disulfide bridges are found in the tertiary structure of a protein. 
B)  Disulfide bridges can occur between nonadjacent, and even distant, amino acids. 
C)  Disulfide bridges are covalent bonds. 
D)  Reducing a disulfide bridge gives two thiols. 
E)  A disulfide bridge is weaker than a hydrogen bond. 
A)  Disulfide bridges are found in the tertiary structure of a protein. 
B)  Disulfide bridges can occur between nonadjacent, and even distant, amino acids. 
C)  Disulfide bridges are covalent bonds. 
D)  Reducing a disulfide bridge gives two thiols. 
E)  A disulfide bridge is weaker than a hydrogen bond.

Which statement about noncompetitive inhibitors is FALSE?

Which of the following types of interactions result in proteins folding so that nonpolar residues are on the interior of the protein, protected from water?

Which structure illustrates an amino acid as a zwitterion?

Sickle-cell anemia is caused by

Which structure illustrates an amino acid in a solution with a high pH?

Which of the following choices is NOT a problem associated with sickle-cell anemia?

Which of the amino acids in the following structure are at the N-terminus?

What type of secondary structure is in blue in the following protein?

Which of the following is the proper amino acid chain designator of the peptide below? I.Val-Ser-Ala II.Ser-Ala-Val III)Ala-Ser-Val

Is the peptide shown below chiral?

What types of biomolecules are enzymes?

Which of the following is NOT one of the four categories of biomolecules?

What is the molecular shape of the carbon with the asterisk next to it?

An enzyme inhibitor is a compound that

Which statement about quaternary structure is TRUE?

Aspartic acid has a side chain that contains a carboxylic acid.At physiological pH, what is the structure of aspartic acid?

How does your body know which proteins to make and in what order to place the amino acids when the proteins are synthesized?

Which interaction holds the α-helix and the β-pleated sheet into its unique folding pattern?

At low pH, the amino acid zwitterion reacts with hydronium (H₃O⁺).What is the product of this acid-base reaction?

Which statement about disulfide bridges is FALSE?

Matter, Energy, and Measurement

Atomic Structure and Radioisotopes

Ionic and Covalent Compounds

Molecular Geometry, Polarity, and Intermolecular

Chemical Quantities and Introduction to Reactions

Chemical Reactions: Energy, Rates, and Equilibrium

Changes of State and Gas Laws

Mixtures, Solution Concentrations, and Diffusion

Acids and Bases, Ph, and Buffers

Introduction to Organic Chemistry:

Alcohols, Phenols, Thiols, Ethers, and Amines

The Carbonyl Containing Functional Groups

The Common Organic Reactions in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

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Exam 16: Proteins: Structure and Function

Which statement about noncompetitive inhibitors is FALSE?

Which of the following types of interactions result in proteins folding so that nonpolar residues are on the interior of the protein, protected from water?

Which structure illustrates an amino acid as a zwitterion?

Sickle-cell anemia is caused by

Which structure illustrates an amino acid in a solution with a high pH?

Which of the following choices is NOT a problem associated with sickle-cell anemia?

Which of the amino acids in the following structure are at the N-terminus?

What type of secondary structure is in blue in the following protein?

Which of the following is the proper amino acid chain designator of the peptide below? I.Val-Ser-Ala II.Ser-Ala-Val III)Ala-Ser-Val

Is the peptide shown below chiral?

What types of biomolecules are enzymes?

Which of the following is NOT one of the four categories of biomolecules?

What is the molecular shape of the carbon with the asterisk next to it?

An enzyme inhibitor is a compound that

Which statement about quaternary structure is TRUE?

Aspartic acid has a side chain that contains a carboxylic acid.At physiological pH, what is the structure of aspartic acid?

How does your body know which proteins to make and in what order to place the amino acids when the proteins are synthesized?

Which interaction holds the α-helix and the β-pleated sheet into its unique folding pattern?

At low pH, the amino acid zwitterion reacts with hydronium (H3O+).What is the product of this acid-base reaction?

Which statement about disulfide bridges is FALSE?

Matter, Energy, and Measurement

Atomic Structure and Radioisotopes

Ionic and Covalent Compounds

Molecular Geometry, Polarity, and Intermolecular

Chemical Quantities and Introduction to Reactions

Chemical Reactions: Energy, Rates, and Equilibrium

Changes of State and Gas Laws

Mixtures, Solution Concentrations, and Diffusion

Acids and Bases, Ph, and Buffers

Introduction to Organic Chemistry:

Alcohols, Phenols, Thiols, Ethers, and Amines

The Carbonyl Containing Functional Groups

The Common Organic Reactions in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

Filters

At low pH, the amino acid zwitterion reacts with hydronium (H₃O⁺).What is the product of this acid-base reaction?