Question 1

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 2

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

Accepted Answer

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

Question 3

Serine exists primarily in its neutral form at a pH ~ 6.

Accepted Answer

A) True 
 B)False

Question 4

No one plant source has sufficient amounts of all of the essential amino acids.

Accepted Answer

A) True 
 B)False

Question 5

Which amino acid is a basic amino acid?

Accepted Answer

A) Serine 
B) Arginine 
C) Cysteine 
D) Alanine 
A) Serine 
B) Arginine 
C) Cysteine 
D) Alanine

Question 6

Which choice is the unique structural feature of collagen?

Accepted Answer

A) α-coil 
B) β-sheet 
C) Disulfide linkage 
D) Triple helix 
A) α-coil 
B) β-sheet 
C) Disulfide linkage 
D) Triple helix

Question 7

Denaturation of a protein results in the loss of its native conformation and its biological activity. Which statement best describes what happens to a protein when it is denatured?

Accepted Answer

A) Peptide bonds are broken. 
B) New amino acids are joined to the peptide backbone. 
C) Secondary,tertiary,and quaternary levels of structure are disrupted. 
D) The N-terminal and C-terminal ends of the protein are hydrolyzed by enzymes. 
A) Peptide bonds are broken. 
B) New amino acids are joined to the peptide backbone. 
C) Secondary,tertiary,and quaternary levels of structure are disrupted. 
D) The N-terminal and C-terminal ends of the protein are hydrolyzed by enzymes.

Question 8

Which conditions are commonly diagnosed by measuring the levels of specific enzymes in the blood?

Accepted Answer

A) Heart attack 
B) High blood pressure 
C) Pregnancy 
D) Migraines 
A) Heart attack 
B) High blood pressure 
C) Pregnancy 
D) Migraines

Question 9

What is the C-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 10

Which statement about oxytocin and vasopressin is not true?

Accepted Answer

A) Oxytocin and vasopressin each contain nine amino acids. 
B) Oxytocin and vasopressin each contain cysteine on both sides of a disulfide bond. 
C) Oxytocin and vasopressin each contain a single disulfide bond. 
D) Oxytocin and vasopressin each contain cysteine as the C-terminal amino acid. 
A) Oxytocin and vasopressin each contain nine amino acids. 
B) Oxytocin and vasopressin each contain cysteine on both sides of a disulfide bond. 
C) Oxytocin and vasopressin each contain a single disulfide bond. 
D) Oxytocin and vasopressin each contain cysteine as the C-terminal amino acid.

Question 11

A diet of rice and tofu provides all essential amino acids.

Accepted Answer

A) True 
 B)False

Question 12

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 13

Hydrogen bonding is possible between the side chains of the amino acids tyrosine and threonine.

Accepted Answer

A) True 
 B)False

Question 14

The amide bonds in peptides and proteins are called peptide bonds.

Accepted Answer

A) True 
 B)False

Question 15

Proteins are long chains of amino acids joined together by peptide bonds. Which structure properly depicts the peptide bond formed between two generic amino acids?

Accepted Answer

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

Question 16

There are ________ amino acids that occur naturally in proteins.

Accepted Answer

A) 12 
B) 15 
C) 20 
D) 21 
E) 30 
A) 12 
B) 15 
C) 20 
D) 21 
E) 30

Question 17

What type of intermolecular forces exist between the side chains of glutamic acid and lysine?

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

Question 18

What is the strongest type of interaction between two cysteine amino acid side chains 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 19

D-Amino acids have the -NH3+ group on the left side in the Fischer projection.

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 21: Amino Acids,proteins,and Enzymes

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

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

Serine exists primarily in its neutral form at a pH ~ 6.

No one plant source has sufficient amounts of all of the essential amino acids.

Which amino acid is a basic amino acid?

Which choice is the unique structural feature of collagen?

Denaturation of a protein results in the loss of its native conformation and its biological activity. Which statement best describes what happens to a protein when it is denatured?

Which conditions are commonly diagnosed by measuring the levels of specific enzymes in the blood?

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

Which statement about oxytocin and vasopressin is not true?

A diet of rice and tofu provides all essential amino acids.

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

Hydrogen bonding is possible between the side chains of the amino acids tyrosine and threonine.

The amide bonds in peptides and proteins are called peptide bonds.

Proteins are long chains of amino acids joined together by peptide bonds. Which structure properly depicts the peptide bond formed between two generic amino acids?

There are ________ amino acids that occur naturally in proteins.

What type of intermolecular forces exist between the side chains of glutamic acid and lysine?

What is the strongest type of interaction between two cysteine amino acid side chains in a protein?

D-Amino acids have the -NH3+ group on the left side in the Fischer projection.

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

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

Filters

D-Amino acids have the -NH₃⁺ group on the left side in the Fischer projection.