Question 1

Fibrin and thrombin, two proteins involved in blood clotting, are first synthesized as the zymogens fibrinogen and prothrombin, respectively.

Accepted Answer

A) True 
 B)False

Question 2

The Fischer projection below represents a naturally occurring amino acid.

Accepted Answer

A) True 
 B)False

Question 3

Amino acids typically exist in nature as neutral molecules with all uncharged atoms.

Accepted Answer

A) True 
 B)False

Question 4

What type of inhibitor binds to the enzyme but does not bind at the active site?

Accepted Answer

A) a noncompetitive inhibitor 
B) a competitive inhibitor 
C) a reversible inhibitor 
D) an irreversible inhibitor 
A) a noncompetitive inhibitor 
B) a competitive inhibitor 
C) a reversible inhibitor 
D) an irreversible inhibitor

Question 5

Both the myosin and the $\alpha$-keratin are proteins composed almost entirely of $\beta$-pleated sheets.

Accepted Answer

A) True 
 B)False

Question 6

In hydrolysis of a peptide or protein, the addition of water breaks the hydrogen bonds that hold the amino acids together in the peptide chain.

Accepted Answer

A) True 
 B)False

Question 7

The amino acids aspartic acid and glutamic acid have a +1 net charge at low pH, and a -2 net charge at high pH.

Accepted Answer

A) True 
 B)False

Question 8

It is possible for two different proteins to contain the same number and type of amino acids.

Accepted Answer

A) True 
 B)False

Question 9

What is the process of altering the shape of a protein without breaking the amide bonds that form the primary structure?

Accepted Answer

A) hydrolysis 
B) competitive inhibition 
C) denaturation 
D) oxidation 
A) hydrolysis 
B) competitive inhibition 
C) denaturation 
D) oxidation

Question 10

Globular proteins are coiled into compact shapes with hydrophilic outer surfaces that make them water soluble.

Accepted Answer

A) True 
 B)False

Question 11

The $\beta$-pleated sheet forms when two or more peptide chains, called strands, line up side-by-side with the C=O and N-H bonds in the plane of the sheets.

Accepted Answer

A) True 
 B)False

Question 12

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 13

What is the N-terminal amino acid in the tetrapeptide glycylalanyisoleucylmethionine?

Accepted Answer

A) alanine 
B) glycine 
C) methionine 
D) isoleucine 
A) alanine 
B) glycine 
C) methionine 
D) isoleucine

Question 14

Molecules that cause an enzyme to lose its activity are called _____.

Accepted Answer

The answer of Molecules that cause an enzyme to lose...

Question 15

The difference between normal hemoglobin and sickle cell hemoglobin is that a single amino acid of both $\beta$ subunits is changed from glutamic acid to _____.

Accepted Answer

The answer of The difference between normal hemoglobin and sickle...

Question 16

A _____ is a peptide that contains four amino acids joined together by three peptide bonds.

Accepted Answer

The answer of A _____ is a peptide that contains...

Question 17

Amino acids are the building blocks of the body's proteins. Which statement concerning amino acids is false?

Accepted Answer

A) There are approximately 200 standard amino acids that occur naturally in the proteins of the human body. 
B) Except for when R=H, amino acids are chiral molecules. 
C) The amino acids found in human proteins are "alpha" amino acids. 
D) The properties of amino acids and the proteins they compose are determined by the nature of the side chain groups that are present. 
A) There are approximately 200 standard amino acids that occur naturally in the proteins of the human body. 
B) Except for when R=H, amino acids are chiral molecules. 
C) The amino acids found in human proteins are "alpha" amino acids. 
D) The properties of amino acids and the proteins they compose are determined by the nature of the side chain groups that are present.

Question 18

The _____ of an enzyme is the region where substrate binding and catalysis occur.

Accepted Answer

The answer of The _____ of an enzyme is the...

Question 19

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 20

Acidic amino acids have lower pI values than basic amino acids.

Accepted Answer

A) True 
 B)False

Exam 21: Amino Acids, Proteins, and Enzymes

Fibrin and thrombin, two proteins involved in blood clotting, are first synthesized as the zymogens fibrinogen and prothrombin, respectively.

The Fischer projection below represents a naturally occurring amino acid.

Amino acids typically exist in nature as neutral molecules with all uncharged atoms.

What type of inhibitor binds to the enzyme but does not bind at the active site?

Both the myosin and the α\alphaα -keratin are proteins composed almost entirely of β\betaβ -pleated sheets.

In hydrolysis of a peptide or protein, the addition of water breaks the hydrogen bonds that hold the amino acids together in the peptide chain.

The amino acids aspartic acid and glutamic acid have a +1 net charge at low pH, and a -2 net charge at high pH.

It is possible for two different proteins to contain the same number and type of amino acids.

What is the process of altering the shape of a protein without breaking the amide bonds that form the primary structure?

Globular proteins are coiled into compact shapes with hydrophilic outer surfaces that make them water soluble.

The β\betaβ -pleated sheet forms when two or more peptide chains, called strands, line up side-by-side with the C=O and N-H bonds in the plane of the sheets.

What is the name of the amino acid shown below?

What is the N-terminal amino acid in the tetrapeptide glycylalanyisoleucylmethionine?

Molecules that cause an enzyme to lose its activity are called _____.

The difference between normal hemoglobin and sickle cell hemoglobin is that a single amino acid of both β\betaβ subunits is changed from glutamic acid to _____.

A _____ is a peptide that contains four amino acids joined together by three peptide bonds.

Amino acids are the building blocks of the body's proteins. Which statement concerning amino acids is false?

The _____ of an enzyme is the region where substrate binding and catalysis occur.

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

Acidic amino acids have lower pI values than basic amino acids.

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

Digestion and the Conversion of Food Into Energy

Carbohydrate, Lipid, and Protein Metabolism

Filters

Both the myosin and the $\alpha$ -keratin are proteins composed almost entirely of $\beta$ -pleated sheets.

The $\beta$ -pleated sheet forms when two or more peptide chains, called strands, line up side-by-side with the C=O and N-H bonds in the plane of the sheets.

The difference between normal hemoglobin and sickle cell hemoglobin is that a single amino acid of both $\beta$ subunits is changed from glutamic acid to _____.