Question 1

Which of the following examples of protein structure would be classified as the tertiary structure of a protein?

Accepted Answer

A)  β-pleated sheet 
B)  gly-leu-trp-lys-lys-arg-met 
C)  three identical subunits 
D)  an elongated α-helix between two β-pleated sheets 
E)  amorphous, globular peptide 
A)  β-pleated sheet 
B)  gly-leu-trp-lys-lys-arg-met 
C)  three identical subunits 
D)  an elongated α-helix between two β-pleated sheets 
E)  amorphous, globular peptide

Question 2

Choose the INCORRECT statement.

Accepted Answer

A)  Peptides are amino acids joined by a peptide bond. 
B)  A tripeptide has three peptide bonds. 
C)  A protein is hydrolyzed to a mixture of α-amino acids. 
D)  An α-amino acid is a carboxylic acid with an amine group on the α carbon. 
E)  Proteins are a polymer of amino acid units. 
A)  Peptides are amino acids joined by a peptide bond. 
B)  A tripeptide has three peptide bonds. 
C)  A protein is hydrolyzed to a mixture of α-amino acids. 
D)  An α-amino acid is a carboxylic acid with an amine group on the α carbon. 
E)  Proteins are a polymer of amino acid units.

Question 3

Choose the INCORRECT prediction. By careful inspection of the formula of lactic acid, CH3CH(OH)COOH, one would predict:

Accepted Answer

A)  Molecules should have two forms. These forms are mirror images of one another. 
B)  Molecule should show cis and trans isomerism. 
C)  Molecule should have a chiral carbon atom. 
D)  Molecule should show optical isomerism. 
E)  Molecule should show acidic properties. 
A)  Molecules should have two forms. These forms are mirror images of one another. 
B)  Molecule should show cis and trans isomerism. 
C)  Molecule should have a chiral carbon atom. 
D)  Molecule should show optical isomerism. 
E)  Molecule should show acidic properties.

Question 4

Enantiomers have the same chemical and physical properties.

Accepted Answer

A) True 
 B)False

Question 5

The R group CH2C6H5 belongs to which amino acid?

Accepted Answer

A)  aspartic acid 
B)  phenylalamine 
C)  cysteine 
D)  tyrosine 
E)  arginine 
A)  aspartic acid 
B)  phenylalamine 
C)  cysteine 
D)  tyrosine 
E)  arginine

Question 6

Choose the correct statement.

Accepted Answer

A)  Fructose is a pentose. 
B)  All sugars have oxygen and are good oxidizing agents 
C)  Reducing sugars don't open into the straight chain form. 
D)  Sucrose is a disaccharide. 
E)  Ribose and deoxyribose are hexoses. 
A)  Fructose is a pentose. 
B)  All sugars have oxygen and are good oxidizing agents 
C)  Reducing sugars don't open into the straight chain form. 
D)  Sucrose is a disaccharide. 
E)  Ribose and deoxyribose are hexoses.

Question 7

Below is a double stranded DNA composed of one strand containing 15N atoms and the other strand containing 14N atoms. If the cell which contains this DNA is grown for one generation (replication) on 15N medium and then transferred to 14N media for a second generation, what would the resulting double stranded DNA molecules look like?

Accepted Answer

A)  Four molecules; each containing one 14N strand and one 15N strand. 
B)  Two molecules; one with a 15N and a 14N strand, the other with two 14N strands. 
C)  Four molecules; three containing one 14N strand and one 15N strand and one molecule with two 14N strands. 
D)  Four molecules; one with two 15N strands, two molecules with two 14N strands, and one molecule with one 14N and one 15N strands. 
E)  Four molecules; all molecules have 14N strands. 
A)  Four molecules; each containing one 14N strand and one 15N strand. 
B)  Two molecules; one with a 15N and a 14N strand, the other with two 14N strands. 
C)  Four molecules; three containing one 14N strand and one 15N strand and one molecule with two 14N strands. 
D)  Four molecules; one with two 15N strands, two molecules with two 14N strands, and one molecule with one 14N and one 15N strands. 
E)  Four molecules; all molecules have 14N strands.

Question 8

The fundamental agents involved in energy transfer are adenosine diphosphate (ADP) and adenosine triphosphate(ATP).

Accepted Answer

A) True 
 B)False

Question 9

Which of the following is a monosaccharide?

Accepted Answer

A)  glycogen 
B)  animal fat 
C)  cellulose 
D)  starch 
E)  sucrose 
A)  glycogen 
B)  animal fat 
C)  cellulose 
D)  starch 
E)  sucrose

Question 10

What four elements make up approximately 96% of the total human body mass?

Accepted Answer

A)  C, N, O, P 
B)  C, O, Ca, N 
C)  Mg, Cu, Fe, N 
D)  C, O, N, H2O 
E)  C, H, N, O 
A)  C, N, O, P 
B)  C, O, Ca, N 
C)  Mg, Cu, Fe, N 
D)  C, O, N, H2O 
E)  C, H, N, O

Question 11

Metabolic reactions in which substances are broken down are referred to as anabolism.

Accepted Answer

A) True 
 B)False

Question 12

β-D-N-Acetylglucosamine (shown below) is a glycose found in many glycoproteins which are an integral part of cell membranes. One chair conformation of this glycose is shown below. How many of the hydroxyl groups on the six-membered ring occupy equatorial positions?

Accepted Answer

A)  2 
B)  4 
C)  0 
D)  3 
E)  1 
A)  2 
B)  4 
C)  0 
D)  3 
E)  1

Question 13

How many tripeptides can be formed from serine, alanine, and glycine?

Accepted Answer

A)  6 
B)  4 
C)  8 
D)  10 
A)  6 
B)  4 
C)  8 
D)  10

Question 14

Amino acids are joined into proteins by:

Accepted Answer

A)  a 3'-5' linkage 
B)  a beta 1-4 linkage 
C)  DNA 
D)  an ester 
E)  peptide bonds 
A)  a 3'-5' linkage 
B)  a beta 1-4 linkage 
C)  DNA 
D)  an ester 
E)  peptide bonds

Question 15

Which of the following are unimportant for tertiary structure of the proteins?

Accepted Answer

A)  salt linkage 
B)  disulfide bonds 
C)  hydrophobic interactions 
D)  van der Waals forces 
E)  hydrogen bonding 
A)  salt linkage 
B)  disulfide bonds 
C)  hydrophobic interactions 
D)  van der Waals forces 
E)  hydrogen bonding

Question 16

Choose the INCORRECT statement.

Accepted Answer

A)  Fats become rancid when they hydrolyze and cleave at the double bonds by oxidation. 
B)  Antioxidants retard fat rancidity. 
C)  Medical studies correlate a high intake of saturated fats and coronary heart disease. 
D)  Healthy diets called for unsaturated fatty acids. 
E)  In general, mammal fats are unsaturated. 
A)  Fats become rancid when they hydrolyze and cleave at the double bonds by oxidation. 
B)  Antioxidants retard fat rancidity. 
C)  Medical studies correlate a high intake of saturated fats and coronary heart disease. 
D)  Healthy diets called for unsaturated fatty acids. 
E)  In general, mammal fats are unsaturated.

Question 17

Which of the following is a polysaccharide?

Accepted Answer

A)  ribose 
B)  fructose 
C)  glucose 
D)  glycogen 
E)  pentose 
A)  ribose 
B)  fructose 
C)  glucose 
D)  glycogen 
E)  pentose

Question 18

Enantiomers are non-superimposable mirror images,

Accepted Answer

A) True 
 B)False

Question 19

Choose the INCORRECT statement.

Accepted Answer

A)  Glucose, galactose and mannose exist in straight-chain and in ring structures. 
B)  Two monosaccharides combine by losing a water molecule to form a disaccharide. 
C)  The important natural disaccharides are maltose, cellobiose, lactose and sucrose. 
D)  Glycogen is the reserve carbohydrate of animals. 
E)  Glycogen cannot be broken down by human digestion. 
A)  Glucose, galactose and mannose exist in straight-chain and in ring structures. 
B)  Two monosaccharides combine by losing a water molecule to form a disaccharide. 
C)  The important natural disaccharides are maltose, cellobiose, lactose and sucrose. 
D)  Glycogen is the reserve carbohydrate of animals. 
E)  Glycogen cannot be broken down by human digestion.

Question 20

The cell is the fundamental unit of all life.

Accepted Answer

A) True 
 B)False

Exam 28: Chemistry of the Living State

Which of the following examples of protein structure would be classified as the tertiary structure of a protein?

Choose the INCORRECT statement.

Choose the INCORRECT prediction. By careful inspection of the formula of lactic acid, CH3CH(OH)COOH, one would predict:

Enantiomers have the same chemical and physical properties.

The R group CH2C6H5 belongs to which amino acid?

Choose the correct statement.

The fundamental agents involved in energy transfer are adenosine diphosphate (ADP) and adenosine triphosphate(ATP).

Which of the following is a monosaccharide?

What four elements make up approximately 96% of the total human body mass?

Metabolic reactions in which substances are broken down are referred to as anabolism.

β-D-N-Acetylglucosamine (shown below) is a glycose found in many glycoproteins which are an integral part of cell membranes. One chair conformation of this glycose is shown below. How many of the hydroxyl groups on the six-membered ring occupy equatorial positions?

How many tripeptides can be formed from serine, alanine, and glycine?

Amino acids are joined into proteins by:

Which of the following are unimportant for tertiary structure of the proteins?

Choose the INCORRECT statement.

Which of the following is a polysaccharide?

Enantiomers are non-superimposable mirror images,

Choose the INCORRECT statement.

The cell is the fundamental unit of all life.

Matter - Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Additional Aspects

Intermolecular Forces: Liquids and Solids

Solutions and Their Physical Properties

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements I: Groups 1, 2, 13, and 14

Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry 1-41

Structures of Organic Compounds

Reactions of Organic Compounds

Filters

Choose the INCORRECT prediction. By careful inspection of the formula of lactic acid, CH₃CH(OH)COOH, one would predict:

The R group CH₂C₆H₅ belongs to which amino acid?