Question 1

What happens to the melting point in fatty acids as the unsaturation increases?

Accepted Answer

A)  It increases 
B)  It decreases. 
C)  There is no direct correlation between unsaturation and melting point. 
D)  The melting point stays the same. 
A)  It increases 
B)  It decreases. 
C)  There is no direct correlation between unsaturation and melting point. 
D)  The melting point stays the same. B

Question 2

What is the correct classification of the following compound? CH3(CH2)15COOH

Accepted Answer

A)  saturated triglyceride 
B)  simple lipid 
C)  wax 
D)  saturated fatty acid 
A)  saturated triglyceride 
B)  simple lipid 
C)  wax 
D)  saturated fatty acid D

Question 3

How many isoprene units are contained in the following molecule?

Accepted Answer

A)  5 
B)  4 
C)  3 
D)  2 
A)  5 
B)  4 
C)  3 
D)  2 B

Question 4

Provide a definition of the term lipid.

Accepted Answer

A)  a compound with a carbonyl group 
B)  a compound with an aromatic ring 
C)  a hydrophobic biomolecule 
D)  a water-soluble compound 
A)  a compound with a carbonyl group 
B)  a compound with an aromatic ring 
C)  a hydrophobic biomolecule 
D)  a water-soluble compound

Question 5

Which of the following classes of molecules is not a nonhydrolyzable lipid?

Accepted Answer

A)  steroids 
B)  terpenes 
C)  phospholipids 
D)  eicosanoids 
A)  steroids 
B)  terpenes 
C)  phospholipids 
D)  eicosanoids

Question 6

What is the name of the reaction of triglycerides with a base?

Accepted Answer

A)  esterification 
B)  transesterification 
C)  ozonolysis 
D)  saponification 
A)  esterification 
B)  transesterification 
C)  ozonolysis 
D)  saponification

Question 7

Which of the following compounds is a steroid?

Accepted Answer

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

Question 8

Which of the following are complex lipids?

Accepted Answer

A)  steroids 
B)  terpenes 
C)  waxes 
D)  protaglandins 
A)  steroids 
B)  terpenes 
C)  waxes 
D)  protaglandins

Question 9

Which of the following fatty acids is not present in natural fats and oils?

Accepted Answer

A)  hexadecanoic acid 
B)  heptadecanoic acid 
C)  octadecanoic acid 
D)  none of the choices 
A)  hexadecanoic acid 
B)  heptadecanoic acid 
C)  octadecanoic acid 
D)  none of the choices

Question 10

Sphingomyelins are a major component of the myelin sheath. Damage to the myelin sheath results in such diseases as multiple sclerosis. Which compound below corresponds to a sphingomyelin?

Accepted Answer

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

Question 11

Eicosanoids are derived from what compound?

Accepted Answer

A)  arachidonic acid 
B)  cyclohexane 
C)  cholesterol 
D)  triacyl glycerols 
A)  arachidonic acid 
B)  cyclohexane 
C)  cholesterol 
D)  triacyl glycerols

Question 12

Which of the following compounds is not a lipid?

Accepted Answer

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

Question 13

Which of the following is not one of the three main categories of hydrolyzable lipids?

Accepted Answer

A)  waxes 
B)  steroids 
C)  triacylglycerols 
D)  phospholipids 
A)  waxes 
B)  steroids 
C)  triacylglycerols 
D)  phospholipids

Question 14

What is the result of the oxidation of arachidonic acid with O2 by cyclooxygenase?

Accepted Answer

A)  It results in the synthesis of prostaglandins, thromboxanes, and prostacyclins. 
B)  It results in the synthesis of fat-soluble vitamins from sphingomyelins. 
C)  It results in the synthesis of phosphoacylglycerols. 
D)  It is an important step in the synthesis of lipids that form the lipid bilayer. 
A)  It results in the synthesis of prostaglandins, thromboxanes, and prostacyclins. 
B)  It results in the synthesis of fat-soluble vitamins from sphingomyelins. 
C)  It results in the synthesis of phosphoacylglycerols. 
D)  It is an important step in the synthesis of lipids that form the lipid bilayer.

Question 15

Which of the following fatty acids has the highest melting point?

Accepted Answer

A)  linoleic acid 
B)  oleic acid 
C)  arachidonic acid 
D)  palmitoleic acid 
A)  linoleic acid 
B)  oleic acid 
C)  arachidonic acid 
D)  palmitoleic acid

Question 16

Which structure represents the lowest energy conformation of a trans-decalin?

Accepted Answer

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

Question 17

Which of the following sequences shows a reasonable series of 1,2-rearrangements as might be found in the biosynthesis of a steroid?

Accepted Answer

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

Question 18

Which of the following fatty acids has the lowest melting point?

Accepted Answer

A)  linoleic acid 
B)  oleic acid 
C)  arachidonic acid 
D)  palmitoleic acid 
A)  linoleic acid 
B)  oleic acid 
C)  arachidonic acid 
D)  palmitoleic acid

Question 19

What chemical process causes an oil (such as soybean oil) to become rancid?

Accepted Answer

A)  hydrogenation with hydrogen 
B)  hydration with water 
C)  oxidation with molecular oxygen 
D)  bromination with bromine 
A)  hydrogenation with hydrogen 
B)  hydration with water 
C)  oxidation with molecular oxygen 
D)  bromination with bromine

Question 20

The stereoselective introduction of the C15 OH group on the F1F1F1S1F1F1F10 side chain of prostaglandins has presented a challenge for synthetic chemists. Recently, Mulzer and co-workers demonstrated a new route in which the F1F1F1S1F1F1F10 side chain is synthesized independently and then attached to the bicyclic counterpart. What is the appropriate sequence of reagents for the following synthesis?

Accepted Answer

A)  (1) PBr3; (2) Grubbs' catalyst, Reagent X; (3) KOC(CH3)3 
B)  (1) PCC; (2) Ph3P=CH2; (3) Grubbs' catalyst, Reagent X 
C)  (1) PBr3; (2) Ph3P=CH2; (3) Grubbs' catalyst, Reagent X 
D)  (1) TsCl, pyridine; (2) Grubbs' catalyst, Reagent X; (3) KOC(CH3)3 
A)  (1) PBr3; (2) Grubbs' catalyst, Reagent X; (3) KOC(CH3)3 
B)  (1) PCC; (2) Ph3P=CH2; (3) Grubbs' catalyst, Reagent X 
C)  (1) PBr3; (2) Ph3P=CH2; (3) Grubbs' catalyst, Reagent X 
D)  (1) TsCl, pyridine; (2) Grubbs' catalyst, Reagent X; (3) KOC(CH3)3

Exam 30: Lipids

What happens to the melting point in fatty acids as the unsaturation increases?

What is the correct classification of the following compound? CH3(CH2)15COOH

How many isoprene units are contained in the following molecule?

Provide a definition of the term lipid.

Which of the following classes of molecules is not a nonhydrolyzable lipid?

What is the name of the reaction of triglycerides with a base?

Which of the following compounds is a steroid?

Which of the following are complex lipids?

Which of the following fatty acids is not present in natural fats and oils?

Sphingomyelins are a major component of the myelin sheath. Damage to the myelin sheath results in such diseases as multiple sclerosis. Which compound below corresponds to a sphingomyelin?

Eicosanoids are derived from what compound?

Which of the following compounds is not a lipid?

Which of the following is not one of the three main categories of hydrolyzable lipids?

What is the result of the oxidation of arachidonic acid with O2 by cyclooxygenase?

Which of the following fatty acids has the highest melting point?

Which structure represents the lowest energy conformation of a trans-decalin?

Which of the following sequences shows a reasonable series of 1,2-rearrangements as might be found in the biosynthesis of a steroid?

Which of the following fatty acids has the lowest melting point?

What chemical process causes an oil (such as soybean oil) to become rancid?

Structure and Bonding

Acids and Bases

Introduction to Organic Molecules and Functional Groups

Alkanes

Stereochemistry

Understanding Organic Reactions

Alkyl Halides and Nucleophilic Substitution

Alkyl Halides and Elimination Reactions

Alcohols, Ethers and Epoxides

Alkenes

Alkynes

Oxidation and Reduction

Mass Spectrometry and Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Radical Reactions

Conjugation, Resonance, and Dienes

Benzene and Aromatic Compounds

Electrophilic Aromatic Substitution

Carboxylic Acids and the Acidity of the O-H Bond

Introduction to Carbonyl Chemistry; Organometallic Reagents; Oxidation and Reduction

Aldehydes and Ketones Nucleophilic Addition

Carboxylic Acids and Derivatives

Substitution Reactions of Carbonyl Compounds at the Alpha-Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond Forming Reactions in Organic Synthesis

Pericyclic Reactions

Carbohydrates

Amino Acids and Proteins

Synthetic Polymers

Filters

What is the correct classification of the following compound? CH₃(CH₂)₁₅COOH

What is the result of the oxidation of arachidonic acid with O₂ by cyclooxygenase?