Question 1

Which protein stores iron in the liver?

Accepted Answer

A) Ferritin 
B) Keratin 
C) Myoglobin 
D) Collagen 
A) Ferritin 
B) Keratin 
C) Myoglobin 
D) Collagen

Question 2

Which is the simplest amino acid?

Accepted Answer

A) Serine 
B) Glutamine 
C) Cysteine 
D) Glycine 
A) Serine 
B) Glutamine 
C) Cysteine 
D) Glycine

Question 3

A reversible inhibitor does which of the following?

Accepted Answer

A) It covalently binds to an enzyme,permanently destroying its activity. 
B) It binds to the enzyme,but does not bind at the active side. 
C) It binds to an enzyme but then enzyme activity is restored when the inhibitor is released. 
D) It has a shape and structure similar to the substrate,so it competes with the substrate for binding to the active side. 
A) It covalently binds to an enzyme,permanently destroying its activity. 
B) It binds to the enzyme,but does not bind at the active side. 
C) It binds to an enzyme but then enzyme activity is restored when the inhibitor is released. 
D) It has a shape and structure similar to the substrate,so it competes with the substrate for binding to the active side.

Question 4

The enzyme in the ribbon diagram shown is composed primarily of β-pleated sheets.

Accepted Answer

A) True 
 B)False

Question 5

The "cartoon" shown is an example of noncompetitive inhibition.

Accepted Answer

A) True 
 B)False

Question 6

HIV protease inhibitors are used to treat HIV by binding to an enzyme needed by the virus to replicate itself.

Accepted Answer

A) True 
 B)False

Question 7

The term protein is usually reserved for polymers of more than ________ amino acids.

Accepted Answer

A) 10 
B) 40 
C) 200 
D) 1000 
A) 10 
B) 40 
C) 200 
D) 1000

Question 8

What is the strongest type of interaction between the side chains of an isoleucine amino acid and a phenylalanine amino acid in a protein?

Accepted Answer

A) Hydrogen bonding 
B) London dispersion forces 
C) Disulfide bond 
D) Electrostatic interactions 
A) Hydrogen bonding 
B) London dispersion forces 
C) Disulfide bond 
D) Electrostatic interactions

Question 9

Which statement is not true?

Accepted Answer

A) A cofactor is always a metal ion needed for an enzyme-catalyzed reaction to occur. 
B) The names of most enzymes end in the suffix -ase. 
C) An enzyme-catalyzed reaction can be 106 to 1012 times faster than a similar uncatalyzed reaction. 
D) Enzymes are proteins that serve as biological catalysts for reactions in all living organisms. 
A) A cofactor is always a metal ion needed for an enzyme-catalyzed reaction to occur. 
B) The names of most enzymes end in the suffix -ase. 
C) An enzyme-catalyzed reaction can be 106 to 1012 times faster than a similar uncatalyzed reaction. 
D) Enzymes are proteins that serve as biological catalysts for reactions in all living organisms.

Question 10

The hydrolysis of the amide bonds in a protein forms the individual amino acids that comprise the primary structure.

Accepted Answer

A) True 
 B)False

Question 11

By convention,the C-terminal amino acid is always written at the right end of the peptide chain and the N-terminal amino acid at the left.

Accepted Answer

A) True 
 B)False

Question 12

When the peptide below is hydrolyzed with water,the products are the amino acids proline,cysteine,and glutamine.

Accepted Answer

A) True 
 B)False

Question 13

What is the three-letter abbreviation of asparagine?

Accepted Answer

A) Asp 
B) Asg 
C) Asn 
D) Arg 
A) Asp 
B) Asg 
C) Asn 
D) Arg

Question 14

What is the name of the amino acid shown below?

Accepted Answer

A) L-cysteine 
B) D-cysteine 
C) L-serine 
D) D-serine 
A) L-cysteine 
B) D-cysteine 
C) L-serine 
D) D-serine

Question 15

What is the structure of the amino acid phenylalanine at pH 1?

Accepted Answer

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

Question 16

Which is an example of a globular protein?

Accepted Answer

A) Collagen 
B) α-keratin 
C) Hemoglobin 
D) Amylopectin 
A) Collagen 
B) α-keratin 
C) Hemoglobin 
D) Amylopectin

Question 17

Insulin is a small protein consisting of two polypeptide chains held together by hydrogen bonds.

Accepted Answer

A) True 
 B)False

Question 18

What type of intermolecular forces exist between the side chains of isoleucine and valine?

Accepted Answer

A) Electrostatic attraction 
B) London dispersion forces 
C) Hydrogen bond 
D) Disulfide bond 
A) Electrostatic attraction 
B) London dispersion forces 
C) Hydrogen bond 
D) Disulfide bond

Exam 21: Amino Acids,proteins,and Enzymes

Which protein stores iron in the liver?

Which is the simplest amino acid?

A reversible inhibitor does which of the following?

The enzyme in the ribbon diagram shown is composed primarily of β-pleated sheets.

The "cartoon" shown is an example of noncompetitive inhibition.

HIV protease inhibitors are used to treat HIV by binding to an enzyme needed by the virus to replicate itself.

The term protein is usually reserved for polymers of more than ________ amino acids.

What is the strongest type of interaction between the side chains of an isoleucine amino acid and a phenylalanine amino acid in a protein?

Which statement is not true?

The hydrolysis of the amide bonds in a protein forms the individual amino acids that comprise the primary structure.

By convention,the C-terminal amino acid is always written at the right end of the peptide chain and the N-terminal amino acid at the left.

When the peptide below is hydrolyzed with water,the products are the amino acids proline,cysteine,and glutamine.

What is the three-letter abbreviation of asparagine?

What is the name of the amino acid shown below?

What is the structure of the amino acid phenylalanine at pH 1?

Which is an example of a globular protein?

Insulin is a small protein consisting of two polypeptide chains held together by hydrogen bonds.

What type of intermolecular forces exist between the side chains of isoleucine and valine?

Matter and Measurement

Atoms and the Periodic Table

Ionic Compounds

Covalent Compounds

Chemical Reactions

Energy Changes,reaction Rates,and Equilibrium

Gases,liquids,and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Molecules and Functional Groups

Alkanes

Unsaturated Hydrocarbons

Organic Compounds That Contain Oxygen,halogen,or Sulfur

The Three-Dimensional Shape of Molecules

Aldehydes and Ketones

Carboxylic Acids,esters,and Amides

Amines and Neurotransmitters

Lipids

Carbohydrates

Nucleic Acids and Protein Synthesis

Metabolism and Energy Production

Carbohydrate,lipid,and Protein Metabolism

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