Question 1

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 2

The cell is the fundamental unit of all life.

Accepted Answer

A) True 
 B)False

Question 3

At the isoelectric point,an amino acid has what charges?

Accepted Answer

A) + and - 
B) none 
C) + only 
D) - only 
E) multiple charges 
A) + and - 
B) none 
C) + only 
D) - only 
E) multiple charges

Question 4

Which of the following is correct with respect to the purine and pyrimidine bases in nucleic acids?

Accepted Answer

A) G + A = C + T 
B) A = C 
C) G = T 
D) T = C 
A) G + A = C + T 
B) A = C 
C) G = T 
D) T = C

Question 5

Choose the molecule which may display optical isomerism.

Accepted Answer

A) CH2OH-CH(OH)-CH2OH 
B) CH3CH2CH(OH)CH3  
C) NH3CH2COOH 
D) O   CH3(CH2)16COH 
E) O   HOCH2CH2CH 
A) CH2OH-CH(OH)-CH2OH 
B) CH3CH2CH(OH)CH3  
C) NH3CH2COOH 
D) O   CH3(CH2)16COH 
E) O   HOCH2CH2CH

Question 6

Diastereomers have the same chemical and physical properties.

Accepted Answer

A) True 
 B)False

Question 7

Choose the INCORRECT statement.

Accepted Answer

A) When the long chain monocarboxylic acids are removed from a triglyceride they are called fatty acids. 
B) Saturated fatty acids have multiple double bonds. 
C) Triglycerides can be hydrolyzed in alkaline solution to glycerol and salts of fatty acids. 
D) Salts of fatty acids are called soaps. 
E) The hydrolysis of triglycerides is called saponification. 
A) When the long chain monocarboxylic acids are removed from a triglyceride they are called fatty acids. 
B) Saturated fatty acids have multiple double bonds. 
C) Triglycerides can be hydrolyzed in alkaline solution to glycerol and salts of fatty acids. 
D) Salts of fatty acids are called soaps. 
E) The hydrolysis of triglycerides is called saponification.

Question 8

Which of the following is a pyrimidine?

Accepted Answer

A) thymine 
B) adenine 
C) glycine 
D) arginine 
E) pyridine 
A) thymine 
B) adenine 
C) glycine 
D) arginine 
E) pyridine

Question 9

The R group -CH3 belongs to which amino acid?

Accepted Answer

A) glycine 
B) lysine 
C) proline 
D) alanine 
E) histidine 
A) glycine 
B) lysine 
C) proline 
D) alanine 
E) histidine

Question 10

Which one of the following amino acids contains a polar side chain?

Accepted Answer

A) alanine 
B) glycine 
C) threonine 
D) valine 
A) alanine 
B) glycine 
C) threonine 
D) valine

Question 11

Which of the following is an aromatic amino acid?

Accepted Answer

A) leucine 
B) tryptophan 
C) arginine 
D) cysteine 
E) alanine 
A) leucine 
B) tryptophan 
C) arginine 
D) cysteine 
E) alanine

Question 12

Which of the following structural elements cannot be found in DNA?

Accepted Answer

A) purine 
B) pentose 
C) phosphate 
D) heme 
E) pyrimidine 
A) purine 
B) pentose 
C) phosphate 
D) heme 
E) pyrimidine

Question 13

The R group CH2C6H5 belongs to which amino acid?

Accepted Answer

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

Question 14

Choose the INCORRECT statement.

Accepted Answer

A) Amino acids can exist as dipolar ions. 
B) Dipolar ions are also called zwitterion. 
C) Isoelectric point is the pH at which an amino acid becomes a cation. 
D) Two amino acids joined by the elimination of a water molecule is a dipeptide. 
E) A large polypeptide of more than 10,000 u is called a protein. 
A) Amino acids can exist as dipolar ions. 
B) Dipolar ions are also called zwitterion. 
C) Isoelectric point is the pH at which an amino acid becomes a cation. 
D) Two amino acids joined by the elimination of a water molecule is a dipeptide. 
E) A large polypeptide of more than 10,000 u is called a protein.

Question 15

Which of the following is a basic amino acid?

Accepted Answer

A) alanine 
B) cysteine 
C) lysine 
D) aspartic acid 
E) glycine 
A) alanine 
B) cysteine 
C) lysine 
D) aspartic acid 
E) glycine

Question 16

The molecule on which an enzyme acts is commonly referred to as:

Accepted Answer

A) reactant 
B) substrate 
C) metabolites 
D) active site 
E) coenzyme 
A) reactant 
B) substrate 
C) metabolites 
D) active site 
E) coenzyme

Question 17

Lipids are those constituents of plant and animal tissue that are soluble in very polar solvents.

Accepted Answer

A) True 
 B)False

Question 18

Which of the following is a minor component of a cell?

Accepted Answer

A) amino acids 
B) carbohydrates 
C) proteins 
D) nucleic acids 
E) hormones 
A) amino acids 
B) carbohydrates 
C) proteins 
D) nucleic acids 
E) hormones

Question 19

Salt linkages:

Accepted Answer

A) occur between acidic and basic R groups 
B) join two halves of cysteine 
C) occur between purine and pyrimidine bases 
D) occur in sugars 
E) connect the cell with the environment 
A) occur between acidic and basic R groups 
B) join two halves of cysteine 
C) occur between purine and pyrimidine bases 
D) occur in sugars 
E) connect the cell with the environment

Question 20

In the sequence His-Tyr-Val-Pro,which amino acid contains the N-terminal group?

Accepted Answer

A) valine 
B) tyrosine 
C) proline 
D) histidine 
A) valine 
B) tyrosine 
C) proline 
D) histidine

Exam 28: Chemistry of the Living State

Which of the following is a polysaccharide?

The cell is the fundamental unit of all life.

At the isoelectric point,an amino acid has what charges?

Which of the following is correct with respect to the purine and pyrimidine bases in nucleic acids?

Choose the molecule which may display optical isomerism.

Diastereomers have the same chemical and physical properties.

Choose the INCORRECT statement.

Which of the following is a pyrimidine?

The R group -CH3 belongs to which amino acid?

Which one of the following amino acids contains a polar side chain?

Which of the following is an aromatic amino acid?

Which of the following structural elements cannot be found in DNA?

The R group CH2C6H5 belongs to which amino acid?

Choose the INCORRECT statement.

Which of the following is a basic amino acid?

The molecule on which an enzyme acts is commonly referred to as:

Lipids are those constituents of plant and animal tissue that are soluble in very polar solvents.

Which of the following is a minor component of a cell?

Salt linkages:

In the sequence His-Tyr-Val-Pro,which amino acid contains the N-terminal group?

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: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Filters

The R group -CH₃ belongs to which amino acid?

The R group CH₂C₆H₅ belongs to which amino acid?