Question 1

Choose the INCORRECT statement.

Accepted Answer

A)  Triglycerides are glyceryl esters. 
B)  Fats and oils are glyceryl esters. 
C)  Oils have predominately saturated acid components. 
D)  Oils are liquid at room temperature. 
E)  Pure fats and oils are colorless, odorless and tasteless. 
A)  Triglycerides are glyceryl esters. 
B)  Fats and oils are glyceryl esters. 
C)  Oils have predominately saturated acid components. 
D)  Oils are liquid at room temperature. 
E)  Pure fats and oils are colorless, odorless and tasteless.

Question 2

Choose the INCORRECT statement.

Accepted Answer

A)  A 50/50 mixture of two enantiomers is a racemic mixture. 
B)  A racemic mixture will not rotate plane polarized light. 
C)  Separating the optical isomers is called resolution. 
D)  Dextrorotatory optical isomers are designated -. 
E)  Molecules that will rotate plane polarized light are optically active. 
A)  A 50/50 mixture of two enantiomers is a racemic mixture. 
B)  A racemic mixture will not rotate plane polarized light. 
C)  Separating the optical isomers is called resolution. 
D)  Dextrorotatory optical isomers are designated -. 
E)  Molecules that will rotate plane polarized light are optically active.

Question 3

Proteins are made of 40 amino acids.

Accepted Answer

A) True 
 B)False

Question 4

All amino acids always contain one chemical element which is absent in the structures of carbohydrates. This element is ________.

Accepted Answer

A)  carbon 
B)  nitrogen 
C)  phosphorus 
D)  sulfur 
E)  oxygen 
A)  carbon 
B)  nitrogen 
C)  phosphorus 
D)  sulfur 
E)  oxygen

Question 5

Enantiomers ALWAYS:

Accepted Answer

A)  have an asymmetric carbon 
B)  have different physical properties 
C)  change the color of light 
D)  rotate polarized light 
E)  have different chemical properties 
A)  have an asymmetric carbon 
B)  have different physical properties 
C)  change the color of light 
D)  rotate polarized light 
E)  have different chemical properties

Question 6

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 7

Lactose, the sugar found in milk, is a disaccharide of galactose and glucose in a 1,4 linkage. What is the configuration of the 1,4 linkage between the two glycoses in lactose?

Accepted Answer

A)  β configuration 
B)  α configuration 
C)  D configuration 
D)  axial configuration 
E)  chair configuration 
A)  β configuration 
B)  α configuration 
C)  D configuration 
D)  axial configuration 
E)  chair configuration

Question 8

Choose the INCORRECT statement.

Accepted Answer

A)  About 50 elements occur in measurable concentrations in living matter. 
B)  About 25 elements have functions that are definitely known. 
C)  Oxygen, carbon, hydrogen and nitrogen account for 96% of human body mass. 
D)  Water is the most abundant compound in most living organisms. 
E)  Mitochondria make up the nucleus of a cell. 
A)  About 50 elements occur in measurable concentrations in living matter. 
B)  About 25 elements have functions that are definitely known. 
C)  Oxygen, carbon, hydrogen and nitrogen account for 96% of human body mass. 
D)  Water is the most abundant compound in most living organisms. 
E)  Mitochondria make up the nucleus of a cell.

Question 9

The R group CH2SH 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 10

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 11

Find a mismatch enzyme - substrate pair.

Accepted Answer

A)  amylases - starch 
B)  amylase - polysaccharides 
C)  lipase - fats and oils 
D)  pepsin - diglycerides 
E)  trypsin and chymotripsin - polypeptides 
A)  amylases - starch 
B)  amylase - polysaccharides 
C)  lipase - fats and oils 
D)  pepsin - diglycerides 
E)  trypsin and chymotripsin - polypeptides

Question 12

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 13

Which of the following fatty acids is unsaturated?

Accepted Answer

A)  palmitic acid 
B)  oleic acid 
C)  myristic acid 
D)  stearic acid 
A)  palmitic acid 
B)  oleic acid 
C)  myristic acid 
D)  stearic acid

Question 14

Partial hydrolysis of an eleven amino acid polypeptide containing an N-terminal glycine yielded the fragments shown below (shown N- to C-terminus from left to right). What is the sequence of the original peptide? gly cys-met-cys
Ala-val-val ile-his
His-trp-met gly-cys
Val-ile met-cys-ala-val

Accepted Answer

A)  C-gly-cys-met-cys-ile-val-val-ala-his-trp-met-N 
B)  N-gly-trp-met-cys-val-ile-ala-val-val-ile-his-C 
C)  N-gly-cys-val-val-ile-trp-his-met-cys-ala-val-C 
D)  N-gly-cys-met-cys-ala-val-val-ile-his-trp-met-C 
E)  C-gly-cys-ala-val-ala-val-val-his trp-met-cys-N 
A)  C-gly-cys-met-cys-ile-val-val-ala-his-trp-met-N 
B)  N-gly-trp-met-cys-val-ile-ala-val-val-ile-his-C 
C)  N-gly-cys-val-val-ile-trp-his-met-cys-ala-val-C 
D)  N-gly-cys-met-cys-ala-val-val-ile-his-trp-met-C 
E)  C-gly-cys-ala-val-ala-val-val-his trp-met-cys-N

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

All of the known elements occur in measurable amounts in the human body.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following compounds may display the property of optical isomerism?

Accepted Answer

A)  3-pentanol 
B)  2-pentene 
C)  2-bromopropane 
D)  2-bromobutane 
E)  acetone 
A)  3-pentanol 
B)  2-pentene 
C)  2-bromopropane 
D)  2-bromobutane 
E)  acetone

Question 18

Living cells are unable to convert glucose-6P i into which of the following?

Accepted Answer

A)  glycogen 
B)  glucose 
C)  coenzyme A 
D)  polysaccharide stored in liver 
E)  it may be metabolized 
A)  glycogen 
B)  glucose 
C)  coenzyme A 
D)  polysaccharide stored in liver 
E)  it may be metabolized

Question 19

Diastereomers have the same chemical and physical properties.

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 28: Chemistry of the Living State

Choose the INCORRECT statement.

Choose the INCORRECT statement.

Proteins are made of 40 amino acids.

All amino acids always contain one chemical element which is absent in the structures of carbohydrates. This element is ________.

Enantiomers ALWAYS:

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

Lactose, the sugar found in milk, is a disaccharide of galactose and glucose in a 1,4 linkage. What is the configuration of the 1,4 linkage between the two glycoses in lactose?

Choose the INCORRECT statement.

The R group CH2SH belongs to which amino acid?

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

Find a mismatch enzyme - substrate pair.

Choose the molecule which may display optical isomerism.

Which of the following fatty acids is unsaturated?

Partial hydrolysis of an eleven amino acid polypeptide containing an N-terminal glycine yielded the fragments shown below (shown N- to C-terminus from left to right). What is the sequence of the original peptide? gly cys-met-cys Ala-val-val ile-his His-trp-met gly-cys Val-ile met-cys-ala-val

Which of the following is a basic amino acid?

All of the known elements occur in measurable amounts in the human body.

Which of the following compounds may display the property of optical isomerism?

Living cells are unable to convert glucose-6P i into which of the following?

Diastereomers have the same chemical and physical properties.

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

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

The R group CH₂SH belongs to which amino acid?