Question 1

Alpha-helices and β-pleated sheets are both examples of

Accepted Answer

A)  primary structure. 
B)  secondary structure. 
C)  tertiary structure. 
D)  quaternary structure. 
E)  both secondary and tertiary structure. 
A)  primary structure. 
B)  secondary structure. 
C)  tertiary structure. 
D)  quaternary structure. 
E)  both secondary and tertiary structure. B

Question 2

Most naturally occurring amino acids are the ______-isomer and most naturally occurring carbohydrates are the ______-isomer.

Accepted Answer

A)  L; D 
B)  D; L 
C)  D; D 
D)  L; D. 
E)  Amino acids and carbohydrates naturally exist as racemic mixtures. 
A)  L; D 
B)  D; L 
C)  D; D 
D)  L; D. 
E)  Amino acids and carbohydrates naturally exist as racemic mixtures. A

Question 3

Is this amino acid L- or D-, and how can you tell?

Accepted Answer

A)  L-, because all amino acids are L 
B)  D-, because all amino acids are D 
C)  D-, because the amine is on the right 
D)  D-, because the amine is on the left 
E)  L-, because the amine is on the left 
A)  L-, because all amino acids are L 
B)  D-, because all amino acids are D 
C)  D-, because the amine is on the right 
D)  D-, because the amine is on the left 
E)  L-, because the amine is on the left C

Question 4

Which amino acid side chain is capable of hydrogen?

Accepted Answer

A)  -CH3 
B)  -CH2OH 
C)  -COOH 
D)  -CH2CH2SCH3 
E)  All of the above are capable. 
A)  -CH3 
B)  -CH2OH 
C)  -COOH 
D)  -CH2CH2SCH3 
E)  All of the above are capable.

Question 5

Which type of protein provides physical support to tissues?

Accepted Answer

A)  receptors 
B)  structural proteins 
C)  immunoglobulins 
D)  transport proteins 
E)  dietary proteins 
A)  receptors 
B)  structural proteins 
C)  immunoglobulins 
D)  transport proteins 
E)  dietary proteins

Question 6

Which statement 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

The following table lists several common vegetarian foods and the amino acids that they are missing.Which of the following combinations supply a complete protein when consumed together? ​
Food
Missing amino acid(s)
Beans
Methionine and tryptophan
Corn
Lysine and tryptophan
Peas
Methionine
Rice
Lysine
Walnuts
Lysine and tryptophan
Wheat
Lysine
​

Accepted Answer

A)  wheat and corn 
B)  corn and beans 
C)  beans and peas 
D)  peas and corn 
E)  beans and walnuts 
A)  wheat and corn 
B)  corn and beans 
C)  beans and peas 
D)  peas and corn 
E)  beans and walnuts

Question 8

Which side chain would MOST likely be involved in hydrogen bonding?

Accepted Answer

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

Question 9

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 10

Inflammation and pain caused by injury results from the production of molecules called prostaglandins.Aspirin and other anti-inflammatories work by binding to the active site of an enzyme that produces the prostaglandins, thus preventing their synthesis.What type of molecule is aspirin?

Accepted Answer

A)  a cofactor 
B)  a substrate 
C)  a competitive inhibitor 
D)  a noncompetitive inhibitor 
E)  a coenzyme 
A)  a cofactor 
B)  a substrate 
C)  a competitive inhibitor 
D)  a noncompetitive inhibitor 
E)  a coenzyme

Question 11

Which statement BEST describes the naming convention for peptides?

Accepted Answer

A)  There is no naming convention. 
B)  Start from the C-terminus and continue in order to the N-terminus. 
C)  Start on the left and continue in order to the right. 
D)  Start from the N-terminus and continue in order to the C-terminus. 
E)  Start on the right and continue in order to the left. 
A)  There is no naming convention. 
B)  Start from the C-terminus and continue in order to the N-terminus. 
C)  Start on the left and continue in order to the right. 
D)  Start from the N-terminus and continue in order to the C-terminus. 
E)  Start on the right and continue in order to the left.

Question 12

Which choice shows how an amino acid reacts in a low pH solution?

Accepted Answer

A)  choice a 
B)  choice b 
C)  choice c 
D)  choice d 
E)  All of these reactions occur to the same extent in a solution with a pH less than 7. 
A)  choice a 
B)  choice b 
C)  choice c 
D)  choice d 
E)  All of these reactions occur to the same extent in a solution with a pH less than 7.

Question 13

Which level of architecture is not affected by denaturation?

Accepted Answer

A)  primary 
B)  secondary 
C)  tertiary 
D)  quaternary 
E)  All levels of architecture are affected by denaturation. 
A)  primary 
B)  secondary 
C)  tertiary 
D)  quaternary 
E)  All levels of architecture are affected by denaturation.

Question 14

Not all proteins have this level of protein architecture.

Accepted Answer

A)  primary structure 
B)  secondary structure 
C)  tertiary structure 
D)  quaternary structure 
E)  both secondary and tertiary structures 
A)  primary structure 
B)  secondary structure 
C)  tertiary structure 
D)  quaternary structure 
E)  both secondary and tertiary structures

Question 15

An example of this type of protein is shown below.

Accepted Answer

A)  keratin 
B)  keratin, elastin, and collagen 
C)  membrane proteins and globular proteins 
D)  globular proteins 
E)  membrane proteins 
A)  keratin 
B)  keratin, elastin, and collagen 
C)  membrane proteins and globular proteins 
D)  globular proteins 
E)  membrane proteins

Question 16

What is indicated by the arrow pointing to part of the Fischer projection below?

Accepted Answer

A)  Nothing, this is just two molecules with their bonds crossed. 
B)  This is a carbon in the side chain of an amino acid. 
C)  This is the alpha carbon of an amino acid. 
D)  This is a carbon with a planar geometry. 
E)  This can be any type of atom. 
A)  Nothing, this is just two molecules with their bonds crossed. 
B)  This is a carbon in the side chain of an amino acid. 
C)  This is the alpha carbon of an amino acid. 
D)  This is a carbon with a planar geometry. 
E)  This can be any type of atom.

Question 17

Physiological pH is a pH of approximately

Accepted Answer

A)  5.7. 
B)  7.4. 
C)  8.1. 
D)  9.1. 
E)  0. 
A)  5.7. 
B)  7.4. 
C)  8.1. 
D)  9.1. 
E)  0.

Question 18

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 the reaction to occur. 
E)  All of the above describe how an enzyme lowers the activation energy. 
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 the reaction to occur. 
E)  All of the above describe how an enzyme lowers the activation energy.

Question 19

This is a regular folding pattern in localized regions of the polypeptide backbone.

Accepted Answer

A)  primary structure 
B)  secondary structure 
C)  tertiary structure 
D)  quaternary structure 
E)  both secondary and tertiary structures 
A)  primary structure 
B)  secondary structure 
C)  tertiary structure 
D)  quaternary structure 
E)  both secondary and tertiary structures

Question 20

Which statement about secondary structures is FALSE?

Accepted Answer

A)  Some proteins only contain α-helices or β sheets. 
B)  Structural proteins often contain only β sheets. 
C)  Secondary structure is stabilized by hydrogen bonding between amides in the polypeptide backbone. 
D)  Side chains are involved in the hydrogen bonds that stabilize the secondary structure. 
E)  A protein can contain both α-helices and β sheets. 
A)  Some proteins only contain α-helices or β sheets. 
B)  Structural proteins often contain only β sheets. 
C)  Secondary structure is stabilized by hydrogen bonding between amides in the polypeptide backbone. 
D)  Side chains are involved in the hydrogen bonds that stabilize the secondary structure. 
E)  A protein can contain both α-helices and β sheets.

Alpha-helices and β-pleated sheets are both examples of

Most naturally occurring amino acids are the -isomer and most naturally occurring carbohydrates are the -isomer.

Is this amino acid L- or D-, and how can you tell?

Which amino acid side chain is capable of hydrogen?

Which type of protein provides physical support to tissues?

Which statement BEST describes the induced-fit model of enzyme action?

Which side chain would MOST likely be involved in hydrogen bonding?

The following compound is a(n)

Inflammation and pain caused by injury results from the production of molecules called prostaglandins.Aspirin and other anti-inflammatories work by binding to the active site of an enzyme that produces the prostaglandins, thus preventing their synthesis.What type of molecule is aspirin?

Which statement BEST describes the naming convention for peptides?

Which choice shows how an amino acid reacts in a low pH solution?

Which level of architecture is not affected by denaturation?

Not all proteins have this level of protein architecture.

An example of this type of protein is shown below.

What is indicated by the arrow pointing to part of the Fischer projection below?

Physiological pH is a pH of approximately

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

This is a regular folding pattern in localized regions of the polypeptide backbone.

Which statement about secondary structures 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

Exam 16: Proteins: Structure and Function

Alpha-helices and β-pleated sheets are both examples of

Most naturally occurring amino acids are the ______-isomer and most naturally occurring carbohydrates are the ______-isomer.

Is this amino acid L- or D-, and how can you tell?

Which amino acid side chain is capable of hydrogen?

Which type of protein provides physical support to tissues?

Which statement BEST describes the induced-fit model of enzyme action?

Which side chain would MOST likely be involved in hydrogen bonding?

The following compound is a(n)

Inflammation and pain caused by injury results from the production of molecules called prostaglandins.Aspirin and other anti-inflammatories work by binding to the active site of an enzyme that produces the prostaglandins, thus preventing their synthesis.What type of molecule is aspirin?

Which statement BEST describes the naming convention for peptides?

Which choice shows how an amino acid reacts in a low pH solution?

Which level of architecture is not affected by denaturation?

Not all proteins have this level of protein architecture.

An example of this type of protein is shown below.

What is indicated by the arrow pointing to part of the Fischer projection below?

Physiological pH is a pH of approximately

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

This is a regular folding pattern in localized regions of the polypeptide backbone.

Which statement about secondary structures 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

Most naturally occurring amino acids are the -isomer and most naturally occurring carbohydrates are the -isomer.