Question 1

Side chains of the amino acids in a protein or peptide are often called________.

Accepted Answer

A)  organic compounds 
B)  derivations 
C)  residues 
D)  fragments 
E)  backbones 
A)  organic compounds 
B)  derivations 
C)  residues 
D)  fragments 
E)  backbones

Question 2

According to the following graph, the activity of the enzyme decreases more sharply at high temperature than at low temperature.What are the reasons for this observation?   I.As temperature is increased, the substrate binding slowly becomes poorer. II.As temperature is decreased, the enzyme moves more slowly and so reacts more slowly.
III)At higher temperatures, the enzyme is denatured and stops working entirely.
IV)Temperature has no effect on enzyme activity.

Accepted Answer

A)  I only 
B)  IV only 
C)  I and III 
D)  II and III 
E)  All are correct. 
A)  I only 
B)  IV only 
C)  I and III 
D)  II and III 
E)  All are correct.

Question 3

During acidosis of a protein, shown below, salt bridges are broken, resulting in denaturation.Which choice shows the products of acidosis?

Accepted Answer

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

Question 4

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 5

In which structure is the box ONLY around the amino acid side chain?

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

At physiological pH, most carboxylic acids exist in their conjugate base form.Which structure illustrates the conjugate base of a carboxylic acid?

Accepted Answer

A)  HCOOH 
B)  CH3COO+ 
C)  HCOO+ 
D)  HCOO- 
E)  CH3COOH2+ 
A)  HCOOH 
B)  CH3COO+ 
C)  HCOO+ 
D)  HCOO- 
E)  CH3COOH2+

Question 7

The following amino acid is classified as polar neutral.Which of the following statements best describes why it is classified this way?   I.Its side chain is not ionizable. II.It buffers a solution at pH 7.
III)It is unreactive.
IV)Its side chain contains a polar functional group.

Accepted Answer

A)  II only 
B)  III only 
C)  III and IV 
D)  I and IV 
E)  I and II 
A)  II only 
B)  III only 
C)  III and IV 
D)  I and IV 
E)  I and II

Question 8

When two amino acids react to form a new amide functional group, the reaction is referred to as a(n)

Accepted Answer

A)  hydrolysis. 
B)  amidation. 
C)  esterification. 
D)  hydration. 
E)  dehydration. 
A)  hydrolysis. 
B)  amidation. 
C)  esterification. 
D)  hydration. 
E)  dehydration.

Question 9

Which structure illustrates an amino acid at physiological 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 10

Which protein can be used for energy when necessary?

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 11

A protein's primary structure is

Accepted Answer

A)  its shape when it is first made. 
B)  its shape when it is not bound to a substrate. 
C)  its three-dimensional shape in which it is biologically active. 
D)  the shape of the protein without any cofactors. 
E)  its amino acid sequence. 
A)  its shape when it is first made. 
B)  its shape when it is not bound to a substrate. 
C)  its three-dimensional shape in which it is biologically active. 
D)  the shape of the protein without any cofactors. 
E)  its amino acid sequence.

Question 12

How many peptide bonds are in a pentapeptide?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 13

Which amino acid is polar neutral?

Accepted Answer

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

Question 14

The structure of myoglobin is shown below.Myoglobin contains which of the following components?   I.α-helices II.β-pleated sheets
III)A prosthetic group

Accepted Answer

A)  I only 
B)  II only 
C)  III only 
D)  I and II 
E)  I and III 
A)  I only 
B)  II only 
C)  III only 
D)  I and II 
E)  I and III

Question 15

This is the three-dimensional structure that occurs from electrostatic interaction between side chains.

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 16

The most common motifs for this level of structure are the helix and the β- pleated sheet.

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 17

How does the potential energy of a correctly folded protein compare to the energy of an unfolded protein or an incorrectly 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 18

During alkalosis of a protein, shown below, salt bridges are broken, resulting in denaturation.Which choice shows the products of alkalosis?

Accepted Answer

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

Question 19

Is Gly-Ala-His the same tripeptide as His-Ala-Gly?

Accepted Answer

A)  No, they are constitutional isomers. 
B)  No, they are stereoisomers. 
C)  Yes, they are conformers. 
D)  Yes, they are the same molecule, just flipped over. 
E)  Yes, the written order of amino acids does not make a difference in the peptide. 
A)  No, they are constitutional isomers. 
B)  No, they are stereoisomers. 
C)  Yes, they are conformers. 
D)  Yes, they are the same molecule, just flipped over. 
E)  Yes, the written order of amino acids does not make a difference in the peptide.

Question 20

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.

Side chains of the amino acids in a protein or peptide are often called________.

During acidosis of a protein, shown below, salt bridges are broken, resulting in denaturation.Which choice shows the products of acidosis?

Which of the following is a complete protein?

In which structure is the box ONLY around the amino acid side chain?

At physiological pH, most carboxylic acids exist in their conjugate base form.Which structure illustrates the conjugate base of a carboxylic acid?

The following amino acid is classified as polar neutral.Which of the following statements best describes why it is classified this way? I.Its side chain is not ionizable. II.It buffers a solution at pH 7. III)It is unreactive. IV)Its side chain contains a polar functional group.

When two amino acids react to form a new amide functional group, the reaction is referred to as a(n)

Which structure illustrates an amino acid at physiological pH?

Which protein can be used for energy when necessary?

A protein's primary structure is

How many peptide bonds are in a pentapeptide?

Which amino acid is polar neutral?

The structure of myoglobin is shown below.Myoglobin contains which of the following components? I.α-helices II.β-pleated sheets III)A prosthetic group

This is the three-dimensional structure that occurs from electrostatic interaction between side chains.

The most common motifs for this level of structure are the helix and the β- pleated sheet.

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

During alkalosis of a protein, shown below, salt bridges are broken, resulting in denaturation.Which choice shows the products of alkalosis?

Is Gly-Ala-His the same tripeptide as His-Ala-Gly?

Hydrolysis of the peptide bonds in peptide below would result in

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

Side chains of the amino acids in a protein or peptide are often called________.

During acidosis of a protein, shown below, salt bridges are broken, resulting in denaturation.Which choice shows the products of acidosis?

Which of the following is a complete protein?

In which structure is the box ONLY around the amino acid side chain?

At physiological pH, most carboxylic acids exist in their conjugate base form.Which structure illustrates the conjugate base of a carboxylic acid?

The following amino acid is classified as polar neutral.Which of the following statements best describes why it is classified this way? I.Its side chain is not ionizable. II.It buffers a solution at pH 7. III)It is unreactive. IV)Its side chain contains a polar functional group.

When two amino acids react to form a new amide functional group, the reaction is referred to as a(n)

Which structure illustrates an amino acid at physiological pH?

Which protein can be used for energy when necessary?

A protein's primary structure is

How many peptide bonds are in a pentapeptide?

Which amino acid is polar neutral?

The structure of myoglobin is shown below.Myoglobin contains which of the following components? I.α-helices II.β-pleated sheets III)A prosthetic group

This is the three-dimensional structure that occurs from electrostatic interaction between side chains.

The most common motifs for this level of structure are the helix and the β- pleated sheet.

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

During alkalosis of a protein, shown below, salt bridges are broken, resulting in denaturation.Which choice shows the products of alkalosis?

Is Gly-Ala-His the same tripeptide as His-Ala-Gly?

Hydrolysis of the peptide bonds in peptide below would result in

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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