Question 1

Genetic coding is responsible for the primary structure of proteins.

Accepted Answer

A) True 
 B)False  True

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

A fully vegetarian diet cannot provide a complete source of protein.

Accepted Answer

A) True 
 B)False  False

Question 4

The human body can synthesize nonessential amino acids, but not essential ones.

Accepted Answer

A) True 
 B)False

Question 5

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 6

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 7

What are the two most common types of secondary structure found in proteins?

Accepted Answer

A) α-helices and β-arrays 
B) double stranded helices and β-arrays 
C) α-helices and β-pleated sheets 
D) β-spirals and α-turns 
E) random coils and β-pleated sheets 
A) α-helices and β-arrays 
B) double stranded helices and β-arrays 
C) α-helices and β-pleated sheets 
D) β-spirals and α-turns 
E) random coils and β-pleated sheets

Question 8

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

Question 9

Which of the statements concerning protein structure is NOT true?

Accepted Answer

A) The primary structure of a protein describes the unique sequence of amino acids in the protein chain. 
B) Secondary structure describes the peptide bonds joining the amino acids together in the protein chain. 
C) Tertiary structure describes the overall three dimensional shape of a protein. 
D) Quaternary structure describes the association of two or more polypeptide chains to form one functioning protein unit. 
E) Hydrogen bonding, disulfide bonds, salt bridges, and van der Waals forces are responsible for maintaining the tertiary structure of a protein. 
A) The primary structure of a protein describes the unique sequence of amino acids in the protein chain. 
B) Secondary structure describes the peptide bonds joining the amino acids together in the protein chain. 
C) Tertiary structure describes the overall three dimensional shape of a protein. 
D) Quaternary structure describes the association of two or more polypeptide chains to form one functioning protein unit. 
E) Hydrogen bonding, disulfide bonds, salt bridges, and van der Waals forces are responsible for maintaining the tertiary structure of a protein.

Question 10

Tuftsin is a peptide that stimulates and promotes the destruction of tumor cells.Its primary structure is shown below.Which of the following is NOT a valid interpretation of its primary structure? Thr-Lys-Pro-Arg

Accepted Answer

A) It is a tetrapeptide. 
B) It contains three peptide bonds. 
C) Threonine is the N-terminal amino acid and arginine is the C-terminal amino acid. 
D) The carboxyl group of lysine is joined to the amino group of proline. 
E) The amino group of arginine is not joined to any other amino acid. 
A) It is a tetrapeptide. 
B) It contains three peptide bonds. 
C) Threonine is the N-terminal amino acid and arginine is the C-terminal amino acid. 
D) The carboxyl group of lysine is joined to the amino group of proline. 
E) The amino group of arginine is not joined to any other amino acid.

Question 11

What type of attractive force is responsible for maintaining the secondary structure of a protein?

Accepted Answer

A) hydrogen bonds between carbonyl and amine groups of peptide bonds 
B) van der Waals forces between hydrophobic R groups of nonpolar amino acids 
C) salt bridges 
D) S-S bonds between thiol-containing amino acids 
E) None of the choices are correct. 
A) hydrogen bonds between carbonyl and amine groups of peptide bonds 
B) van der Waals forces between hydrophobic R groups of nonpolar amino acids 
C) salt bridges 
D) S-S bonds between thiol-containing amino acids 
E) None of the choices are correct.

Question 12

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 13

Proteins are an important nutrient because they provide the elements nitrogen and sulfur, which are not provided by dietary carbohydrates and lipids.

Accepted Answer

A) True 
 B)False

Question 14

How many oxygen molecules can one hemoglobin molecule bind?

Accepted Answer

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

Question 15

Which amino acid contains a thiol in its R group?

Accepted Answer

A) methionine 
B) alanine 
C) cysteine 
D) tyrosine 
E) valine 
A) methionine 
B) alanine 
C) cysteine 
D) tyrosine 
E) valine

Question 16

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 17

Which of the following best describes where the amino acids isoleucine and tryptophan are most likely to be found in the tertiary structure of a protein?

Accepted Answer

A) at the N-terminal end of the protein 
B) at the C-terminal end of the protein 
C) on the exterior surface of the folded protein where contact with water is greatest, due to their hydrophilic nature 
D) in the interior of the folded protein away from water, due to their hydrophobic nature 
E) in the hydrophilic interior of the protein due to their ability to form side chain hydrogen bonds with each other 
A) at the N-terminal end of the protein 
B) at the C-terminal end of the protein 
C) on the exterior surface of the folded protein where contact with water is greatest, due to their hydrophilic nature 
D) in the interior of the folded protein away from water, due to their hydrophobic nature 
E) in the hydrophilic interior of the protein due to their ability to form side chain hydrogen bonds with each other

Question 18

Which of the following statements concerning proteins is FALSE?

Accepted Answer

A) Proteins are polymers of amino acids joined together by amide bonds. 
B) Proteins serve numerous functions in the body, including structural roles, enzymes, hormones, and transport vehicles. 
C) The N-terminal end of a protein contains a free amino group. 
D) The C-terminal end of a protein contains a free methyl group. 
E) Fibrous proteins have long, extended shapes, and are insoluble in water. 
A) Proteins are polymers of amino acids joined together by amide bonds. 
B) Proteins serve numerous functions in the body, including structural roles, enzymes, hormones, and transport vehicles. 
C) The N-terminal end of a protein contains a free amino group. 
D) The C-terminal end of a protein contains a free methyl group. 
E) Fibrous proteins have long, extended shapes, and are insoluble in water.

Question 19

What force of attraction gives rise to the α-helix?

Accepted Answer

A) covalent bonding 
B) disulfide bonding 
C) hydrogen bonding 
D) coordinate bonding 
E) London bonding 
A) covalent bonding 
B) disulfide bonding 
C) hydrogen bonding 
D) coordinate bonding 
E) London bonding

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 18: Protein Structure and Function

Genetic coding is responsible for the primary structure of proteins.

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

A fully vegetarian diet cannot provide a complete source of protein.

The human body can synthesize nonessential amino acids, but not essential ones.

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

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

What are the two most common types of secondary structure found in proteins?

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

Which of the statements concerning protein structure is NOT true?

Tuftsin is a peptide that stimulates and promotes the destruction of tumor cells.Its primary structure is shown below.Which of the following is NOT a valid interpretation of its primary structure? Thr-Lys-Pro-Arg

What type of attractive force is responsible for maintaining the secondary structure of a protein?

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

Proteins are an important nutrient because they provide the elements nitrogen and sulfur, which are not provided by dietary carbohydrates and lipids.

How many oxygen molecules can one hemoglobin molecule bind?

Which amino acid contains a thiol in its R group?

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

Which of the following best describes where the amino acids isoleucine and tryptophan are most likely to be found in the tertiary structure of a protein?

Which of the following statements concerning proteins is FALSE?

What force of attraction gives rise to the α-helix?

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

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 Saturated Hydrocarbons

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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