Question 1

Why doesn't denaturation affect the primary structure of a protein?

Accepted Answer

A)  Actually, denaturation does hydrolyze amino acids. 
B)  because peptide bonds are higher energy bonds than other interactions 
C)  because peptide bonds are stronger than other interactions 
D)  because peptide bonds are weaker than other interactions 
E)  because peptide bonds cannot be broken under any circumstances 
A)  Actually, denaturation does hydrolyze amino acids. 
B)  because peptide bonds are higher energy bonds than other interactions 
C)  because peptide bonds are stronger than other interactions 
D)  because peptide bonds are weaker than other interactions 
E)  because peptide bonds cannot be broken under any circumstances

Question 2

Which of the following amino acids is polar neutral?

Accepted Answer

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

Question 3

Which of the following is a complete protein?

Accepted Answer

A)  meat 
B)  milk 
C)  eggs 
D)  soy 
E)  All of these are complete proteins. 
A)  meat 
B)  milk 
C)  eggs 
D)  soy 
E)  All of these are complete proteins.

Question 4

Which of the amino acids does NOT contain a chiral carbon?

Accepted Answer

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

Question 5

The following compound is a(n)

Accepted Answer

A)  amino acid. 
B)  dipeptide. 
C)  tripeptide. 
D)  polypeptide. 
E)  protein. 
A)  amino acid. 
B)  dipeptide. 
C)  tripeptide. 
D)  polypeptide. 
E)  protein.

Question 6

Which of the following statements best describes the induced-fit model of enzyme action?

Accepted Answer

A)  In this model, the enzyme changes the shape of a substrate using a cofactor. 
B)  In this model, the enzyme adjusts it shape to adapt to the shape of the substrate. 
C)  In this model, the enzyme induces a change of polarity in the substrate that results in bonding. 
D)  In this model, the enzyme's active site is complementary to the shape of the substrate. 
E)  In this model, the enzyme's active site chemically reacts with the substrate. 
A)  In this model, the enzyme changes the shape of a substrate using a cofactor. 
B)  In this model, the enzyme adjusts it shape to adapt to the shape of the substrate. 
C)  In this model, the enzyme induces a change of polarity in the substrate that results in bonding. 
D)  In this model, the enzyme's active site is complementary to the shape of the substrate. 
E)  In this model, the enzyme's active site chemically reacts with the substrate.

Question 7

When several amino acids are connected together, head-to-tail, the resulting molecule is called a(n) __________. When many amino acids are connected together, the molecule is called a(n) ___________.

Accepted Answer

A)  enzyme; polypeptide 
B)  protein; polypeptide 
C)  polypeptide; protein 
D)  polypeptide; enzyme 
E)  nucleic acid; enzyme 
A)  enzyme; polypeptide 
B)  protein; polypeptide 
C)  polypeptide; protein 
D)  polypeptide; enzyme 
E)  nucleic acid; enzyme

Question 8

Which of the following structures illustrates an amino acid in a solution with a high pH?

Accepted Answer

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

Question 9

Which statement best describes how an enzyme lowers the activation energy of a reaction?

Accepted Answer

A)  The enzyme covalently binds to the substrate, lowering its energy. 
B)  The enzyme chemically reacts with the substrate to make it more reactive. 
C)  The enzyme increases the temperature of the substrate, making it more reactive. 
D)  The substrate is held in the correct orientation for reaction to occur. 
E)  All of the above 
A)  The enzyme covalently binds to the substrate, lowering its energy. 
B)  The enzyme chemically reacts with the substrate to make it more reactive. 
C)  The enzyme increases the temperature of the substrate, making it more reactive. 
D)  The substrate is held in the correct orientation for reaction to occur. 
E)  All of the above

Question 10

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 11

Hydrolysis of the peptide bonds in peptide below would result in

Accepted Answer

A)  no reaction. 
B)  a single amino acid. 
C)  two amino acids. 
D)  three amino acids. 
E)  four amino acids. 
A)  no reaction. 
B)  a single amino acid. 
C)  two amino acids. 
D)  three amino acids. 
E)  four amino acids.

Question 12

How does the potential energy of a correctly folded protein compare to the energy of an unfolded protein or a wrongly folded one?

Accepted Answer

A)  The energy of a correctly folded protein is lower. 
B)  The energy of a correctly folded protein is higher. 
C)  The energy of proteins is the same no matter how they are folded or unfolded. 
D)  Proteins do not have energy. 
E)  Sometimes the energy of a correctly folded protein is lower and sometimes it is higher. 
A)  The energy of a correctly folded protein is lower. 
B)  The energy of a correctly folded protein is higher. 
C)  The energy of proteins is the same no matter how they are folded or unfolded. 
D)  Proteins do not have energy. 
E)  Sometimes the energy of a correctly folded protein is lower and sometimes it is higher.

Question 13

Which of the following statements 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.

Question 14

The structure of one of the first ACE inhibitors is given below. What is the purpose of the sulfur in this molecule?

Accepted Answer

A)  It is highly reactive with angiotensin II. 
B)  It binds to a metal on the exterior of ACE. 
C)  It holds the molecule in the active site of ACE. 
D)  It makes Captopril into a strong acid. 
E)  It forms a covalent bond with ACE, permanently deactivating it. 
A)  It is highly reactive with angiotensin II. 
B)  It binds to a metal on the exterior of ACE. 
C)  It holds the molecule in the active site of ACE. 
D)  It makes Captopril into a strong acid. 
E)  It forms a covalent bond with ACE, permanently deactivating it.

Question 15

The following is a description of an enzyme called superoxide dismutase. Refer to this paragraph to answer the following question. Superoxide dismutase is an enzyme that detoxifies a free radical called superoxide. This radical is responsible for causing injury during reperfusion after a heart attack, and is also thought to play a role in Parkinson's Disease.a Depending on what organism the protein is found in, it occurs either as a dimer or tetramer of identical subunits.b The subunits are mostly F1F1F1S1F1F1F10-helical with some β-sheet near the C-terminus.c A metal binding site for manganese, iron, nickel or copper/zinc is composed of residues from both the N-terminus and the C-terminus.d These residues are: His-26, His-81, Asp-167, His-171.e
Which statement refers to primary structure?

Accepted Answer

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

Question 16

Which of the following statements best describes the strategy used for treating hypertension through drug therapies?

Accepted Answer

A)  The strategy is to suppress how the body detects sodium. 
B)  The strategy is to suppress how the body detects low blood pressure. 
C)  The strategy is to lower blood pressure directly. 
D)  The strategy is to permanently disable renin. 
E)  The strategy is to inhibit the pathway that the body uses to increase blood pressure. 
A)  The strategy is to suppress how the body detects sodium. 
B)  The strategy is to suppress how the body detects low blood pressure. 
C)  The strategy is to lower blood pressure directly. 
D)  The strategy is to permanently disable renin. 
E)  The strategy is to inhibit the pathway that the body uses to increase blood pressure.

Question 17

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

Accepted Answer

A)  all of them 
B)  I only 
C)  III only 
D)  II and III 
E)  I and III 
A)  all of them 
B)  I only 
C)  III only 
D)  II and III 
E)  I and III

Question 18

Physiological pH is a pH of approximately

Accepted Answer

A)  5.7. 
B)  7.3. 
C)  8.1. 
D)  9.1. 
E)  0. 
A)  5.7. 
B)  7.3. 
C)  8.1. 
D)  9.1. 
E)  0.

Question 19

Which side chain would most likely be found in the interior of a protein, away from the aqueous environment?

Accepted Answer

A)  -CH2OH 
B)  -CH2SH 
C)  -CH2COOH 
D)  -CH2CONH2 
E)    
A)  -CH2OH 
B)  -CH2SH 
C)  -CH2COOH 
D)  -CH2CONH2 
E)

Question 20

Which of the following correctly shows the electrostatic interaction between amino acids that holds an F1F1F1S1F1F1F10-helix or F1F1F1S1F1F1F10-pleated sheet together?

Accepted Answer

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

Why doesn't denaturation affect the primary structure of a protein?

Which of the following amino acids is polar neutral?

Which of the following is a complete protein?

Which of the amino acids does NOT contain a chiral carbon?

The following compound is a(n)

Which of the following statements best describes the induced-fit model of enzyme action?

When several amino acids are connected together, head-to-tail, the resulting molecule is called a(n) . When many amino acids are connected together, the molecule is called a(n) _.

Which of the following structures illustrates an amino acid in a solution with a high pH?

Which statement best describes how an enzyme lowers the activation energy of a reaction?

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

Hydrolysis of the peptide bonds in peptide below would result in

How does the potential energy of a correctly folded protein compare to the energy of an unfolded protein or a wrongly folded one?

Which of the following statements about disulfide bridges is FALSE?

The structure of one of the first ACE inhibitors is given below. What is the purpose of the sulfur in this molecule?

Which of the following statements best describes the strategy used for treating hypertension through drug therapies?

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

Physiological pH is a pH of approximately

Which side chain would most likely be found in the interior of a protein, away from the aqueous environment?

Which of the following correctly shows the electrostatic interaction between amino acids that holds an -helix or -pleated sheet together?

Measuring Matter and Energy

Atomic Structure and Nuclear Radiation

Compounds and Molecules

Chemical Quantities and Chemical Reactions

Changes of State and the Gas Laws

Organic Chemistry: Hydrocarbons

Organic Chemistry and Biomolecules

Solutions, Colloids and Membranes

Acids and Bases

The Reactions of Organic Functional Groups in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

Filters

Exam 13: Proteins: Structure and Function

Why doesn't denaturation affect the primary structure of a protein?

Which of the following amino acids is polar neutral?

Which of the following is a complete protein?

Which of the amino acids does NOT contain a chiral carbon?

The following compound is a(n)

Which of the following statements best describes the induced-fit model of enzyme action?

When several amino acids are connected together, head-to-tail, the resulting molecule is called a(n) __________. When many amino acids are connected together, the molecule is called a(n) ___________.

Which of the following structures illustrates an amino acid in a solution with a high pH?

Which statement best describes how an enzyme lowers the activation energy of a reaction?

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

Hydrolysis of the peptide bonds in peptide below would result in

How does the potential energy of a correctly folded protein compare to the energy of an unfolded protein or a wrongly folded one?

Which of the following statements about disulfide bridges is FALSE?

The structure of one of the first ACE inhibitors is given below. What is the purpose of the sulfur in this molecule?

Which of the following statements best describes the strategy used for treating hypertension through drug therapies?

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

Physiological pH is a pH of approximately

Which side chain would most likely be found in the interior of a protein, away from the aqueous environment?

Which of the following correctly shows the electrostatic interaction between amino acids that holds an -helix or -pleated sheet together?

Measuring Matter and Energy

Atomic Structure and Nuclear Radiation

Compounds and Molecules

Chemical Quantities and Chemical Reactions

Changes of State and the Gas Laws

Organic Chemistry: Hydrocarbons

Organic Chemistry and Biomolecules

Solutions, Colloids and Membranes

Acids and Bases

The Reactions of Organic Functional Groups in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

Filters

When several amino acids are connected together, head-to-tail, the resulting molecule is called a(n) . When many amino acids are connected together, the molecule is called a(n) _.