Question 1

In the biosynthesis of vitamin D2,which alkane bond of ergosterol is cleaved?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V D

Question 2

Which fatty acid is not likely to occur commonly in natural sources?

Accepted Answer

A)  (Z)- 11-Tetradecenoic acid 
B)  (Z)- 9-Pentadecenoic acid 
C)  Hexadecanoic acid 
D)  (9Z,12Z)- 9,12-octadecadienoic acid 
E)  (Z)-9-hexadecenoic acid 
A)  (Z)- 11-Tetradecenoic acid 
B)  (Z)- 9-Pentadecenoic acid 
C)  Hexadecanoic acid 
D)  (9Z,12Z)- 9,12-octadecadienoic acid 
E)  (Z)-9-hexadecenoic acid B

Question 3

Which fatty acid is likely to occur commonly in natural sources?

Accepted Answer

A)  II 
B)  I and IV 
C)  II and III 
D)  II,III and IV 
E)  V 
A)  II 
B)  I and IV 
C)  II and III 
D)  II,III and IV 
E)  V E

Question 4

Which structure represents a terpene likely to be found in nature?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 5

Which of these reagents would not react with stearic acid?

Accepted Answer

A)  H2,Ni 
B)  SOCl2 
C)  CH3MgI 
D)  NH3/H2O 
E)  LAH 
A)  H2,Ni 
B)  SOCl2 
C)  CH3MgI 
D)  NH3/H2O 
E)  LAH

Question 6

What product would be obtained by catalytic hydrogenation of 5-cholesten-3$\beta$-ol?

Accepted Answer

A)  5$\beta$-Cholestan-3$\beta$-ol 
B)  5$\infty$-Cholestan-3$\beta$-ol 
C)  5$\infty$-Cholestan-3$\infty$-ol 
D)  5$\beta$-Cholestan-3$\infty$-ol 
E)  5-Cholesten-3$\beta$,6$\infty$-diol 
A)  5$\beta$-Cholestan-3$\beta$-ol 
B)  5$\infty$-Cholestan-3$\beta$-ol 
C)  5$\infty$-Cholestan-3$\infty$-ol 
D)  5$\beta$-Cholestan-3$\infty$-ol 
E)  5-Cholesten-3$\beta$,6$\infty$-diol

Question 7

Which fatty acid is responsible for the putrid odor of rancid butter?

Accepted Answer

A)  Valeric acid 
B)  Myristic acid 
C)  Stearic acid 
D)  Oleic acid 
E)  Butyric acid 
A)  Valeric acid 
B)  Myristic acid 
C)  Stearic acid 
D)  Oleic acid 
E)  Butyric acid

Question 8

Show the location of the isoprene units in these terpenes:

Accepted Answer

The answer of Show the location of the isoprene units...

Question 9

What would be the product of the following reaction sequence?

Accepted Answer

A)  CH3(CH2)5CH=CH(CH2)14CH3 
B)  CH3(CH2)5COOCH2(CH2)14CH3  and CH3(CH2)5CH=CH(CH2)7COOCH2(CH2)14CH3 
C)  CH3(CH2)14COOCH2(CH2)14CH3 
D)  CH3(CH2)13CHClCOOCH2(CH2)14CH3 
E)  CH3(CH2)5CH=CH(CH2)7COOCH2(CH2)14CH3 
A)  CH3(CH2)5CH=CH(CH2)14CH3 
B)  CH3(CH2)5COOCH2(CH2)14CH3  and CH3(CH2)5CH=CH(CH2)7COOCH2(CH2)14CH3 
C)  CH3(CH2)14COOCH2(CH2)14CH3 
D)  CH3(CH2)13CHClCOOCH2(CH2)14CH3 
E)  CH3(CH2)5CH=CH(CH2)7COOCH2(CH2)14CH3

Question 10

Which is not a correct statement concerning naturally-occurring triacylglycerols?

Accepted Answer

A)  The greater the degree of unsaturation,the higher the melting point. 
B)  Saponification yields glycerol and a mixture of carboxylic acid salts. 
C)  Solid examples are termed "fats." 
D)  Regardless of the exact nature of the R groups,such compounds are water-insoluble. 
E)  Such compounds frequently,but less correctly,are called "triglycerides." 
A)  The greater the degree of unsaturation,the higher the melting point. 
B)  Saponification yields glycerol and a mixture of carboxylic acid salts. 
C)  Solid examples are termed "fats." 
D)  Regardless of the exact nature of the R groups,such compounds are water-insoluble. 
E)  Such compounds frequently,but less correctly,are called "triglycerides."

Question 11

The characteristic odor of rancid butter is attributed to ___________.

Accepted Answer

the releas

Question 12

In naturally occurring polyunsaturated fatty acids,the relative position of double bonds is rarely ___________.

Accepted Answer

The answer of In naturally occurring polyunsaturated fatty acids,the relative...

Question 13

Which is the repeating unit of natural rubber?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 14

Which compound is a sesquiterpene?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 15

Olestra,a synthetic fat substitute,contributes nothing to the caloric value of foods prepared with it,because it passes through the body without being digested.Why are the lipases,responsible for facilitating normal fat hydrolysis,unable to facilitate the hydrolysis of olestra?

Accepted Answer

In order for a lipase to catalyze hydrol

Question 16

Consider a micelle composed of phosphatidyl choline,shown below.Which part(s)of the molecule would form the hydrophilic surface of the micelle?

Accepted Answer

A)  3 
B)  2 
C)  1 
D)  1 and 2 
E)  2 and 3 
A)  3 
B)  2 
C)  1 
D)  1 and 2 
E)  2 and 3

Question 17

Saturated fatty acids pack efficiently.Therefore the corresponding triacylglycerols tend to be __________ at room temperature and are called __________.

Accepted Answer

The answer of Saturated fatty acids pack efficiently.Therefore the corresponding...

Question 18

How many stereogenic centers are there in cholesterol?

Accepted Answer

A)  2 
B)  4 
C)  6 
D)  8 
E)  16 
A)  2 
B)  4 
C)  6 
D)  8 
E)  16

Question 19

There is growing evidence that "trans" fats are associated with an increased risk of ___________,and the FDA now requires "trans fat" information to be provided on nutrition labels.

Accepted Answer

cardiovasc

Question 20

Which of these is a male sex hormone?

Accepted Answer

A)  Estrone 
B)  Testosterone 
C)  Cholic acid 
D)  Cortisone 
E)  Estradiol 
A)  Estrone 
B)  Testosterone 
C)  Cholic acid 
D)  Cortisone 
E)  Estradiol

Exam 23: Lipids

In the biosynthesis of vitamin D2,which alkane bond of ergosterol is cleaved?

Which fatty acid is not likely to occur commonly in natural sources?

Which fatty acid is likely to occur commonly in natural sources?

Which structure represents a terpene likely to be found in nature?

Which of these reagents would not react with stearic acid?

What product would be obtained by catalytic hydrogenation of 5-cholesten-3 β\betaβ -ol?

Which fatty acid is responsible for the putrid odor of rancid butter?

Show the location of the isoprene units in these terpenes:

What would be the product of the following reaction sequence?

Which is not a correct statement concerning naturally-occurring triacylglycerols?

The characteristic odor of rancid butter is attributed to ___________.

In naturally occurring polyunsaturated fatty acids,the relative position of double bonds is rarely ___________.

Which is the repeating unit of natural rubber?

Which compound is a sesquiterpene?

Olestra,a synthetic fat substitute,contributes nothing to the caloric value of foods prepared with it,because it passes through the body without being digested.Why are the lipases,responsible for facilitating normal fat hydrolysis,unable to facilitate the hydrolysis of olestra?

Consider a micelle composed of phosphatidyl choline,shown below.Which part(s)of the molecule would form the hydrophilic surface of the micelle?

Saturated fatty acids pack efficiently.Therefore the corresponding triacylglycerols tend to be __________ at room temperature and are called __________.

How many stereogenic centers are there in cholesterol?

There is growing evidence that "trans" fats are associated with an increased risk of ___________,and the FDA now requires "trans fat" information to be provided on nutrition labels.

Which of these is a male sex hormone?

Carbon Compounds and Chemical Bonds

Representative Carbon Compounds: Functional Groups, Intermolecular Forces, and Infrared Ir Spectroscopy

An Introduction to Organic Reactions: Acids and Bases

Alkanes: Nomenclature, Conformational Analysis, and an Introduction to Synthesis

Stereochemistry: Chiral Molecules

Ionic Reactions - Nucleophilic Substitution and Elimination Reactions of Alkyl Halides

Alkenes and Alkynes I: Properties and Synthesis, Elimination Reactions of Alkyl Halides

Alkenes and Alkynes Ii: Addition Reactions

Nuclear Magnetic Resonance and Mass Spectrometry: Tools for Structure Determination

Radical Reactions

Alcohols and Ethers

Alcohols From Carbonyl Compounds Oxidation-Reduction and Organometallic Compounds

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones I Nucleophilic Addition to the Carbonyl Group

Aldehydes and Ketones Ii Aldol Reactions

Carboxylic Acids and Their Derivatives Nucleophilic Addition - Elimination at the Acyl Carbon

Synthesis and Reactions of Beta-Dicarbonyl Compounds: More Chemistry of Enolate Ions

Amines

Phenols and Aryl Halides: Nucleophilic Aromatic Substitution

Carbohydrates

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

Filters

In the biosynthesis of vitamin D₂,which alkane bond of ergosterol is cleaved?

What product would be obtained by catalytic hydrogenation of 5-cholesten-3 $\beta$ -ol?

Saturated fatty acids pack efficiently.Therefore the corresponding triacylglycerols tend to be at room temperature and are called .