Question 1

The N-terminal amino acid in the peptide Ala-Leu-Gly-His-Pro is

Accepted Answer

A) Alanine. 
B) Leucine. 
C) Glycine. 
D) Histidine. 
E) Proline. 
A) Alanine. 
B) Leucine. 
C) Glycine. 
D) Histidine. 
E) Proline.

Question 2

Polar R groups,along with acidic and basic R groups,are said to be ________ because they are attracted to water molecules.

Accepted Answer

A) hydrophilic 
B) hydrophobic 
C) ionized 
D) unreactive 
E) none of these 
A) hydrophilic 
B) hydrophobic 
C) ionized 
D) unreactive 
E) none of these

Question 3

The peptide bond joining amino acids into proteins is a specific example of the ________ bond.

Accepted Answer

A) amide 
B) carbonyl 
C) ester 
D) glycosidic 
E) hydrogen 
A) amide 
B) carbonyl 
C) ester 
D) glycosidic 
E) hydrogen

Question 4

The type of bond that is most important in maintaining secondary structure of a protein is

Accepted Answer

A) disulfide bridges. 
B) hydrogen bonding within the backbone. 
C) hydrogen bonding between R groups. 
D) salt bridges. 
E) hydrophobic interactions. 
A) disulfide bridges. 
B) hydrogen bonding within the backbone. 
C) hydrogen bonding between R groups. 
D) salt bridges. 
E) hydrophobic interactions.

Question 5

Members of which class of biomolecules are the building blocks of proteins?

Accepted Answer

A) glycerols 
B) monosaccharides 
C) fatty acids 
D) amino acids 
E) nucleic acids 
A) glycerols 
B) monosaccharides 
C) fatty acids 
D) amino acids 
E) nucleic acids

Question 6

The tripeptide represented as ala-leu-gly is named

Accepted Answer

A) Alanine-glycine-leucine. 
B) Alanylglycylleucine. 
C) Alanine-leucine-glycine. 
D) Alanylleucylglycine. 
E) none of these 
A) Alanine-glycine-leucine. 
B) Alanylglycylleucine. 
C) Alanine-leucine-glycine. 
D) Alanylleucylglycine. 
E) none of these

Question 7

Which amino acid is classified as neutral and non-polar?

Accepted Answer

A) aspartic acid 
B) histidine 
C) phenylalanine 
D) lysine 
E) tyrosine 
A) aspartic acid 
B) histidine 
C) phenylalanine 
D) lysine 
E) tyrosine

Question 8

Match the following.
-conjugated protein

Accepted Answer

A) a protein that produces only amino acids upon hydrolysis 
B) the form of an amino acid in which both the carboxyl group and the amine group are charged,but the overall molecule remains neutral 
C) a protein that is usually insoluble in water,is very tough,and has a long shape 
D) a carbon atom bonded to four different groups and therefore able to form enantiomers 
E) a protein with the tertiary structure in which it normally occurs in living systems
F)refers to R groups that do not interact readily with water because they are non-polar
G)a protein that is usually water soluble,having a hydrophilic exterior and hydrophobic interior,and an overall rounded shape
H)refers to R groups which form hydrogen bonds with water because of their polarity
I)a protein that produces amino acids and other biomolecules or inorganic substances upon hydrolysis 
A) a protein that produces only amino acids upon hydrolysis 
B) the form of an amino acid in which both the carboxyl group and the amine group are charged,but the overall molecule remains neutral 
C) a protein that is usually insoluble in water,is very tough,and has a long shape 
D) a carbon atom bonded to four different groups and therefore able to form enantiomers 
E) a protein with the tertiary structure in which it normally occurs in living systems
F)refers to R groups that do not interact readily with water because they are non-polar
G)a protein that is usually water soluble,having a hydrophilic exterior and hydrophobic interior,and an overall rounded shape
H)refers to R groups which form hydrogen bonds with water because of their polarity
I)a protein that produces amino acids and other biomolecules or inorganic substances upon hydrolysis

Question 9

Which protein is considered to be a globular protein?

Accepted Answer

A) albumin 
B) keratin 
C) collagen 
D) myosin 
A) albumin 
B) keratin 
C) collagen 
D) myosin

Question 10

Which of the following objects is chiral?

Accepted Answer

A) a Ping-Pong ball 
B) a nail 
C) a shoe 
D) a fork 
E) a windowpane 
A) a Ping-Pong ball 
B) a nail 
C) a shoe 
D) a fork 
E) a windowpane

Question 11

By convention,the N-terminal end of a protein is usually placed on the ________ of a protein structure.

Accepted Answer

A) right side 
B) left side 
C) center 
D) bottom 
E) top 
A) right side 
B) left side 
C) center 
D) bottom 
E) top

Question 12

Collagen is an example of a(an)

Accepted Answer

A) enzyme. 
B) structural protein. 
C) storage protein. 
D) transport protein. 
E) hormone. 
A) enzyme. 
B) structural protein. 
C) storage protein. 
D) transport protein. 
E) hormone.

Question 13

The quaternary structure of hemoglobin contains

Accepted Answer

A) two subunits. 
B) four subunits. 
C) six subunits. 
D) eight subunits. 
A) two subunits. 
B) four subunits. 
C) six subunits. 
D) eight subunits.

Question 14

Match the following.
-simple protein

Accepted Answer

A) a protein that produces only amino acids upon hydrolysis 
B) the form of an amino acid in which both the carboxyl group and the amine group are charged,but the overall molecule remains neutral 
C) a protein that is usually insoluble in water,is very tough,and has a long shape 
D) a carbon atom bonded to four different groups and therefore able to form enantiomers 
E) a protein with the tertiary structure in which it normally occurs in living systems
F)refers to R groups that do not interact readily with water because they are non-polar
G)a protein that is usually water soluble,having a hydrophilic exterior and hydrophobic interior,and an overall rounded shape
H)refers to R groups which form hydrogen bonds with water because of their polarity
I)a protein that produces amino acids and other biomolecules or inorganic substances upon hydrolysis 
A) a protein that produces only amino acids upon hydrolysis 
B) the form of an amino acid in which both the carboxyl group and the amine group are charged,but the overall molecule remains neutral 
C) a protein that is usually insoluble in water,is very tough,and has a long shape 
D) a carbon atom bonded to four different groups and therefore able to form enantiomers 
E) a protein with the tertiary structure in which it normally occurs in living systems
F)refers to R groups that do not interact readily with water because they are non-polar
G)a protein that is usually water soluble,having a hydrophilic exterior and hydrophobic interior,and an overall rounded shape
H)refers to R groups which form hydrogen bonds with water because of their polarity
I)a protein that produces amino acids and other biomolecules or inorganic substances upon hydrolysis

Question 15

The C-terminal amino acid in the peptide Ala-Leu-Gly-His-Pro is

Accepted Answer

A) Alanine. 
B) Leucine. 
C) Glycine. 
D) Histidine. 
E) Proline. 
A) Alanine. 
B) Leucine. 
C) Glycine. 
D) Histidine. 
E) Proline.

Question 16

Insulin is an example of a(an)

Accepted Answer

A) enzyme. 
B) structural protein. 
C) storage protein. 
D) transport protein. 
E) hormone. 
A) enzyme. 
B) structural protein. 
C) storage protein. 
D) transport protein. 
E) hormone.

Question 17

Proteins are least soluble in water at

Accepted Answer

A) their isoelectric point. 
B) low pH. 
C) neutral pH. 
D) high pH. 
E) both high and low pH. 
A) their isoelectric point. 
B) low pH. 
C) neutral pH. 
D) high pH. 
E) both high and low pH.

Question 18

Match the following.
-hydrophobic

Accepted Answer

A) a protein that produces only amino acids upon hydrolysis 
B) the form of an amino acid in which both the carboxyl group and the amine group are charged,but the overall molecule remains neutral 
C) a protein that is usually insoluble in water,is very tough,and has a long shape 
D) a carbon atom bonded to four different groups and therefore able to form enantiomers 
E) a protein with the tertiary structure in which it normally occurs in living systems
F)refers to R groups that do not interact readily with water because they are non-polar
G)a protein that is usually water soluble,having a hydrophilic exterior and hydrophobic interior,and an overall rounded shape
H)refers to R groups which form hydrogen bonds with water because of their polarity
I)a protein that produces amino acids and other biomolecules or inorganic substances upon hydrolysis 
A) a protein that produces only amino acids upon hydrolysis 
B) the form of an amino acid in which both the carboxyl group and the amine group are charged,but the overall molecule remains neutral 
C) a protein that is usually insoluble in water,is very tough,and has a long shape 
D) a carbon atom bonded to four different groups and therefore able to form enantiomers 
E) a protein with the tertiary structure in which it normally occurs in living systems
F)refers to R groups that do not interact readily with water because they are non-polar
G)a protein that is usually water soluble,having a hydrophilic exterior and hydrophobic interior,and an overall rounded shape
H)refers to R groups which form hydrogen bonds with water because of their polarity
I)a protein that produces amino acids and other biomolecules or inorganic substances upon hydrolysis

Question 19

Match the following.
-globular protein

Accepted Answer

A) a protein that produces only amino acids upon hydrolysis 
B) the form of an amino acid in which both the carboxyl group and the amine group are charged,but the overall molecule remains neutral 
C) a protein that is usually insoluble in water,is very tough,and has a long shape 
D) a carbon atom bonded to four different groups and therefore able to form enantiomers 
E) a protein with the tertiary structure in which it normally occurs in living systems
F)refers to R groups that do not interact readily with water because they are non-polar
G)a protein that is usually water soluble,having a hydrophilic exterior and hydrophobic interior,and an overall rounded shape
H)refers to R groups which form hydrogen bonds with water because of their polarity
I)a protein that produces amino acids and other biomolecules or inorganic substances upon hydrolysis 
A) a protein that produces only amino acids upon hydrolysis 
B) the form of an amino acid in which both the carboxyl group and the amine group are charged,but the overall molecule remains neutral 
C) a protein that is usually insoluble in water,is very tough,and has a long shape 
D) a carbon atom bonded to four different groups and therefore able to form enantiomers 
E) a protein with the tertiary structure in which it normally occurs in living systems
F)refers to R groups that do not interact readily with water because they are non-polar
G)a protein that is usually water soluble,having a hydrophilic exterior and hydrophobic interior,and an overall rounded shape
H)refers to R groups which form hydrogen bonds with water because of their polarity
I)a protein that produces amino acids and other biomolecules or inorganic substances upon hydrolysis

Question 20

List three properties of enantiomers that are the same and three properties that are different.

Accepted Answer

Same:molecular formula,connections betwe

Exam 18: Amino Acids and Proteins

The N-terminal amino acid in the peptide Ala-Leu-Gly-His-Pro is

Polar R groups,along with acidic and basic R groups,are said to be ________ because they are attracted to water molecules.

The peptide bond joining amino acids into proteins is a specific example of the ________ bond.

The type of bond that is most important in maintaining secondary structure of a protein is

Members of which class of biomolecules are the building blocks of proteins?

The tripeptide represented as ala-leu-gly is named

Which amino acid is classified as neutral and non-polar?

Match the following. -conjugated protein

Which protein is considered to be a globular protein?

Which of the following objects is chiral?

By convention,the N-terminal end of a protein is usually placed on the ________ of a protein structure.

Collagen is an example of a(an)

The quaternary structure of hemoglobin contains

Match the following. -simple protein

The C-terminal amino acid in the peptide Ala-Leu-Gly-His-Pro is

Insulin is an example of a(an)

Proteins are least soluble in water at

Match the following. -hydrophobic

Match the following. -globular protein

List three properties of enantiomers that are the same and three properties that are different.

Matter and Measurements

Atoms and the Periodic Table

Ionic Compounds

Molecular Compounds

Classification and Balancing of Chemical Reactions

Chemical Reactions: Mole and Mass Relationships

Chemical Reactions: Energy, rates, and Equilibrium

Gases, liquids, and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Chemistry: Alkanes

Alkenes, alkynes, and Aromatic Compounds

Some Compounds With Oxygen, sulfur, or a Halogen

Amines

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Enzymes and Vitamins

The Generation of Biochemical Energy

Carbohydrates

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Protein and Amino Acid Metabolism

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters