Question 1

Match the following.
-conjugated 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 2

Which of the following processes involve protein denaturation?

Accepted Answer

A) permanent waving of hair 
B) whipping cream 
C) cooking egg whites 
D) More than one response is correct. 
A) permanent waving of hair 
B) whipping cream 
C) cooking egg whites 
D) More than one response is correct.

Question 3

An amino acid will have 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 4

All of the following are non-covalent interactions important in maintaining the secondary,tertiary,and quaternary aspects of amino acids except

Accepted Answer

A) sulfur-sulfur bonds. 
B) hydrogen bonding along the backbone. 
C) hydrogen bonding between R groups. 
D) salt bridges between R groups. 
E) hydrophobic interactions between R groups. 
A) sulfur-sulfur bonds. 
B) hydrogen bonding along the backbone. 
C) hydrogen bonding between R groups. 
D) salt bridges between R groups. 
E) hydrophobic interactions between R groups.

Question 5

In the tetrapeptide Ala-Cys-Val-Leu,the N-terminal amino acid is

Accepted Answer

A) Ala. 
B) Cys. 
C) Val. 
D) Leu. 
E) none of the above 
A) Ala. 
B) Cys. 
C) Val. 
D) Leu. 
E) none of the above

Question 6

Which amino acid is classified as basic?

Accepted Answer

A) valine 
B) threonine 
C) phenylalanine 
D) lysine 
E) glutamic acid 
A) valine 
B) threonine 
C) phenylalanine 
D) lysine 
E) glutamic acid

Question 7

The pH at which the positive and negative charges of an amino acid balance each other is called the

Accepted Answer

A) isoelectric point. 
B) isobaric point. 
C) isobestic point. 
D) isotonic point. 
E) isomer point. 
A) isoelectric point. 
B) isobaric point. 
C) isobestic point. 
D) isotonic point. 
E) isomer point.

Question 8

What type of forces are responsible for maintaining the quaternary structure of a protein?

Accepted Answer

A) ionic bonds 
B) hydrogen bonds 
C) dipole-dipole 
D) hydrophobic interactions 
E) all of these 
A) ionic bonds 
B) hydrogen bonds 
C) dipole-dipole 
D) hydrophobic interactions 
E) all of these

Question 9

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 10

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 11

Oxytocin is a small protein that induces smooth muscle causing contractions during labor.What class of proteins would this belong to?

Accepted Answer

A) storage protein 
B) transport protein 
C) hormone 
D) structural protein 
E) protective protein 
A) storage protein 
B) transport protein 
C) hormone 
D) structural protein 
E) protective protein

Question 12

Keratin,the protein of hair and skin,has extensive sections with which secondary structure?

Accepted Answer

A) beta-pleated sheet 
B) alpha-helix 
C) random coil 
D) alpha-beta 
A) beta-pleated sheet 
B) alpha-helix 
C) random coil 
D) alpha-beta

Question 13

Which pair of amino acids can have hydrophobic interactions?

Accepted Answer

A) arginine and glutamic acid 
B) aspartic acid and lysine 
C) leucine and alanine 
D) glutamic acid and serine 
E) glycine and asparagine 
A) arginine and glutamic acid 
B) aspartic acid and lysine 
C) leucine and alanine 
D) glutamic acid and serine 
E) glycine and asparagine

Question 14

When a protein is ________,its primary structure is maintained,but other aspects of its structure are disrupted.

Accepted Answer

A) denatured 
B) hydrolyzed 
C) ionized 
D) polymerized 
E) esterified 
A) denatured 
B) hydrolyzed 
C) ionized 
D) polymerized 
E) esterified

Question 15

Amino acids 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 16

All of the following are globular proteins except

Accepted Answer

A) myosin. 
B) ribonuclease. 
C) hemoglobin. 
D) albumin. 
E) immunoglobulin. 
A) myosin. 
B) ribonuclease. 
C) hemoglobin. 
D) albumin. 
E) immunoglobulin.

Question 17

Detergents would most likely disrupt what type of stabilizing interaction?

Accepted Answer

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

Question 18

Which category of amino acid contains R groups that are hydrophobic?

Accepted Answer

A) polar 
B) non-polar 
C) basic 
D) acidic 
E) basic and acidic 
A) polar 
B) non-polar 
C) basic 
D) acidic 
E) basic and acidic

Question 19

Amino acids found in proteins all have which of the following features?

Accepted Answer

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

Question 20

Match the following.
-hydrophilic

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

Exam 18: Amino Acids and Proteins

Match the following. -conjugated protein

Which of the following processes involve protein denaturation?

An amino acid will have the form shown at

All of the following are non-covalent interactions important in maintaining the secondary,tertiary,and quaternary aspects of amino acids except

In the tetrapeptide Ala-Cys-Val-Leu,the N-terminal amino acid is

Which amino acid is classified as basic?

The pH at which the positive and negative charges of an amino acid balance each other is called the

What type of forces are responsible for maintaining the quaternary structure of a protein?

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

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

Oxytocin is a small protein that induces smooth muscle causing contractions during labor.What class of proteins would this belong to?

Keratin,the protein of hair and skin,has extensive sections with which secondary structure?

Which pair of amino acids can have hydrophobic interactions?

When a protein is ________,its primary structure is maintained,but other aspects of its structure are disrupted.

Amino acids are least soluble in water at

All of the following are globular proteins except

Detergents would most likely disrupt what type of stabilizing interaction?

Which category of amino acid contains R groups that are hydrophobic?

Amino acids found in proteins all have which of the following features?

Match the following. -hydrophilic

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