Question 1

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 2

The isoelectric point of an amino acid is the pH

Accepted Answer

A) at which it exists in the basic form. 
B) at which it exists in the acid form. 
C) at which it exists in the zwitterion form. 
D) equal to its pKa. 
E) equal to its pKb. 
A) at which it exists in the basic form. 
B) at which it exists in the acid form. 
C) at which it exists in the zwitterion form. 
D) equal to its pKa. 
E) equal to its pKb.

Question 3

All of the following are conjugated proteins except

Accepted Answer

A) cytochrome oxidase. 
B) low-density lipoproteins. 
C) myoglobin. 
D) collagen. 
E) casein. 
A) cytochrome oxidase. 
B) low-density lipoproteins. 
C) myoglobin. 
D) collagen. 
E) casein.

Question 4

An amino acid has the form shown at

Accepted Answer

A) a pH of 7.0. 
B) any pH other than 7.0. 
C) a pH greater than its isoelectric point. 
D) its isoelectric point. 
E) a pH less than its isoelectric point. 
A) a pH of 7.0. 
B) any pH other than 7.0. 
C) a pH greater than its isoelectric point. 
D) its isoelectric point. 
E) a pH less than its isoelectric point.

Question 5

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 6

Which type of interaction is not directly involved in maintaining tertiary structure?

Accepted Answer

A) disulfide bridges 
B) hydrogen bonding 
C) peptide bonds 
D) salt bridges 
E) hydrophobic interactions 
A) disulfide bridges 
B) hydrogen bonding 
C) peptide bonds 
D) salt bridges 
E) hydrophobic interactions

Question 7

This question has four parts: 
A) For the amino acid shown above in zwitterion form,circle the carboxyl group,underline the amine group,label the alpha carbon,and draw a box around the R group.
B) Write the name and abbreviation of your amino acid.
C) Classify the amino acid as polar,non-polar,acidic,or basic.Explain the basis for your classification.
D)Draw the structure of the amino acid at a pH well below its isoelectric point and well above its isoelectric point.

Accepted Answer

Any amino acid may be drawn in.This ques

Question 8

Illustrate the backbone of a protein using a planar unit from one Ca carbon to the next Ca.

Accepted Answer

The answer of Illustrate the backbone of a protein using...

Question 9

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 10

Amino acids used in proteins generally are

Accepted Answer

A) α-amino acids. 
B) l-amino acids. 
C) d-amino acids. 
D) All are correct. 
E) None are correct. 
A) α-amino acids. 
B) l-amino acids. 
C) d-amino acids. 
D) All are correct. 
E) None are correct.

Question 11

Match the following.
-globular protein

Accepted Answer

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

Question 12

The side chains or R groups of amino acids can be classified into each of the following categories except

Accepted Answer

A) polar. 
B) non-polar. 
C) basic. 
D) acidic. 
E) isoelectric. 
A) polar. 
B) non-polar. 
C) basic. 
D) acidic. 
E) isoelectric.

Question 13

Which of the following amino acids contains an alcohol group?

Accepted Answer

A) Phe 
B) Val 
C) Asp 
D) Thr 
E) Cys 
A) Phe 
B) Val 
C) Asp 
D) Thr 
E) Cys

Question 14

Which structure represents a zwitterion?

Accepted Answer

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

Question 15

The two protein chains in insulin are held together by

Accepted Answer

A) disulfide linkages. 
B) hydrophobic interactions. 
C) hydrogen bonds. 
D) salt bridges. 
E) all of the above 
A) disulfide linkages. 
B) hydrophobic interactions. 
C) hydrogen bonds. 
D) salt bridges. 
E) all of the above

Question 16

Match the following.
-native protein

Accepted Answer

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

Question 17

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 18

The beta-pleated sheet is an example of

Accepted Answer

A) primary structure. 
B) secondary structure. 
C) tertiary structure. 
D) quaternary structure. 
E) none of the above 
A) primary structure. 
B) secondary structure. 
C) tertiary structure. 
D) quaternary structure. 
E) none of the above

Question 19

Draw the tripeptide as it would be found at pH = 7: ala-gly-phe

Accepted Answer

The answer of Draw the tripeptide as it would be...

Question 20

All of the following can be classified as biomolecules except

Accepted Answer

A) carbohydrates. 
B) proteins. 
C) lipids. 
D) nucleic acids. 
E) All of the above are biomolecules. 
A) carbohydrates. 
B) proteins. 
C) lipids. 
D) nucleic acids. 
E) All of the above are biomolecules.

Exam 18: Amino Acids and Proteins

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

The isoelectric point of an amino acid is the pH

All of the following are conjugated proteins except

An amino acid has the form shown at

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

Which type of interaction is not directly involved in maintaining tertiary structure?

Illustrate the backbone of a protein using a planar unit from one Ca carbon to the next Ca.

Insulin is an example of a(an)

Amino acids used in proteins generally are

Match the following. -globular protein

The side chains or R groups of amino acids can be classified into each of the following categories except

Which of the following amino acids contains an alcohol group?

Which structure represents a zwitterion?

The two protein chains in insulin are held together by

Match the following. -native protein

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

The beta-pleated sheet is an example of

Draw the tripeptide as it would be found at pH = 7: ala-gly-phe

All of the following can be classified as biomolecules except

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

Aldehydes and Ketones

Amines

Carboxylic Acids and Their Derivatives

Enzymes and Vitamins

Carbohydrates

The Generation of Biochemical Energy

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Protein and Amino Acid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters