Question 1

Identify the bonds that link the isoprene units in $\alpha$ -farnesene,shown below.How are these units linked: head to head,tail to head or tail to tail?  $\alpha$-farnesene

Accepted Answer

The answer of Identify the bonds that link the isoprene...

Question 2

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

Question 3

Draw the most stable chair conformation of menthol and label each substituent as axial or equatorial.

Accepted Answer

All substituents are equatorial.

Question 4

Which of these lipids yields choline upon hydrolysis?

Accepted Answer

A)  A lecithin only
B)  A sphingomyelin and a cerebroside
C)  A cephalin and a lecithin
D)  A cerebroside and a cephalin
E)  A lecithin and a sphingomyelin E

Question 5

Choline cannot be found as a product of hydrolysis of any representative of this class of lipids.

Accepted Answer

A)  Cerebrosides
B)  Phosphatidylserine
C)  Plasmalogens
D)  Waxes
E)  None of these choices yield choline upon hydrolysis

Question 6

The compounds I and II are:

Accepted Answer

A)  Prostaglandins.
B)  Terpenoids.
C)  I is a prostaglandin; II is not a prostaglandin.
D)  I is an E type prostaglandin; II is an F type prostaglandin.
E)  Both are fatty acids.

Question 7

Terpenes are built up from two or more five-carbon units known as ___.

Accepted Answer

The answer of Terpenes are built up from two or...

Question 8

How many chiral centers does prostaglandin E2 have? Assign R,S configurations to these centers.

Accepted Answer

The answer of How many chiral centers does prostaglandin E2...

Question 9

Rank the following fatty acids according to increasing melting point. I: CH3(CH2) 16CO2H
II: CH3(CH2) 7CH=CH(CH2) 7CO2H (cis) 
III: CH3(CH2) 7CH=CH(CH2) 7CO2H (trans) 
IV: HO2C(CH2) 7CH=CHCH2CH=CH(CH2) 7CH3 (cis,cis)

Accepted Answer

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

Question 10

Which of the following could be used to prepare myristic acid,CH3(CH2) 12COOH?

Accepted Answer

A)  CH3(CH2) 11CH2Br,CN-,heat; then H3O+,heat
B)  CH3(CH2) 11CH2Br,Mg,(C2H5) 2O; then CO2; then H3O+
C)  CH3(CH2) 12CHO,Ag2O,OH-; then H3O+
D)  Two of these choices.
E)  All of these choices.

Question 11

Which of these is a detergent?

Accepted Answer

A)  CH3(CH2) 16COO-Na+
B)  [CH3(CH2) 14COO-]2Ca2+
C)  CH3(CH2) 10CH2SO3-Na+
D)  HOCH2CHOHCH2OH
E)  CH3(CH2) 14CH2SH

Question 12

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 triacylglycerols are termed "fats."
D)  Regardless of the exact nature of the R groups,such compounds are water-insoluble.
E)  Such compounds frequently are called "triglycerides."

Question 13

How many stereogenic centers are there in cholesterol?

Accepted Answer

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

Question 14

The product of the following reaction sequence is nervonic acid.What is the structure of nervonic acid?

Accepted Answer

A)   
B)   
C)   
D)   
E)    B

Question 15

Myelin,the protective coating around nerve fibers,is made up of ___.

Accepted Answer

sphingolip...

Question 16

The synthesis of cortisone required placing a ketone function at the 11-position of a steroid.Where is position 11?

Accepted Answer

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

Question 17

How could you synthesize stearolic acid,CH3(CH2) 7C=C(CH2) 7COOH from oleic acid,CH3(CH2) 7CH=CH(CH2) 7COOH?

Accepted Answer

A)  Br2,CCl4; then 3 NaNH2,heat; then H3O+
B)  Li,liq.NH3; then H3O+
C)  H2,Pd
D)  Peracid; then H3O+; then HA,H2O,heat
E)  Excess HCl; then KOH,C2H5OH,heat

Question 18

Which of the following statements regarding triacylglycerols is not true?

Accepted Answer

A)  Some undergo autoxidation with oxygen from air.
B)  They are solid if they do not have alkene groups.
C)  They form lipid bilayers.
D)  They form micelles in water.
E)  Two of these choices are false statements.

Question 19

Salts of long-chain fatty acids are known as ___.

Accepted Answer

The answer of Salts of long-chain fatty acids are known...

Question 20

What is a mixed triacylglycerol?

Accepted Answer

A)  It is a lipid where a terpene is esterifying glycerol
B)  It is a triester of glycerol where the acyl groups are identical
C)  It is a triester formed by glycerol and acetic acid
D)  It is a triester of glycerol where the fatty acids are not all identical
E)  It is an ester between glycerol and cholesterol

Exam 23: Lipids

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

Correct Answer
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Draw the most stable chair conformation of menthol and label each substituent as axial or equatorial.

Correct Answer
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11eaa4bc_3e46_903e_9180_67d4a7a153f3_TB5902_00 All substituents are equatorial.

Which of these lipids yields choline upon hydrolysis?

Correct Answer
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E

Choline cannot be found as a product of hydrolysis of any representative of this class of lipids.

Correct Answer
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The compounds I and II are:

Correct Answer
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Terpenes are built up from two or more five-carbon units known as ___.

Correct Answer
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How many chiral centers does prostaglandin E2 have? Assign R,S configurations to these centers.

Correct Answer
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Rank the following fatty acids according to increasing melting point. I: CH₃(CH₂) ₁₆CO₂H II: CH₃(CH₂) ₇CH=CH(CH₂) ₇CO₂H (cis) III: CH₃(CH₂) ₇CH=CH(CH₂) ₇CO₂H (trans) IV: HO₂C(CH₂) ₇CH=CHCH₂CH=CH(CH₂) ₇CH₃(cis,cis)

Correct Answer
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Which of the following could be used to prepare myristic acid,CH₃(CH₂) ₁₂COOH?

Correct Answer
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Which of these is a detergent?

Correct Answer
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Which is not a correct statement concerning naturally occurring triacylglycerols?

Correct Answer
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How many stereogenic centers are there in cholesterol?

Correct Answer
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The product of the following reaction sequence is nervonic acid.What is the structure of nervonic acid?

Correct Answer
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B

Myelin,the protective coating around nerve fibers,is made up of ___.

Correct Answer
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sphingolip...
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The synthesis of cortisone required placing a ketone function at the 11-position of a steroid.Where is position 11?

Correct Answer
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How could you synthesize stearolic acid,CH₃(CH₂) ₇C=C(CH₂) ₇COOH from oleic acid,CH₃(CH₂) ₇CH=CH(CH₂) ₇COOH?

Correct Answer
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Which of the following statements regarding triacylglycerols is not true?

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Salts of long-chain fatty acids are known as ___.

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What is a mixed triacylglycerol?

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Exam 23: Lipids

Identify the bonds that link the isoprene units in α\alphaα -farnesene,shown below.How are these units linked: head to head,tail to head or tail to tail? α\alphaα -farnesene

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Draw the most stable chair conformation of menthol and label each substituent as axial or equatorial.

Correct Answerverified11eaa4bc_3e46_903e_9180_67d4a7a153f3_TB5902_00 All substituents are equatorial.

Which of these lipids yields choline upon hydrolysis?

Correct AnswerverifiedE

Choline cannot be found as a product of hydrolysis of any representative of this class of lipids.

Correct AnswerverifiedShow Answer

The compounds I and II are:

Correct AnswerverifiedShow Answer

Terpenes are built up from two or more five-carbon units known as ___.

Correct AnswerverifiedShow Answer

How many chiral centers does prostaglandin E2 have? Assign R,S configurations to these centers.

Correct AnswerverifiedShow Answer

Rank the following fatty acids according to increasing melting point. I: CH3(CH2) 16CO2H II: CH3(CH2) 7CH=CH(CH2) 7CO2H (cis) III: CH3(CH2) 7CH=CH(CH2) 7CO2H (trans) IV: HO2C(CH2) 7CH=CHCH2CH=CH(CH2) 7CH3 (cis,cis)

Correct AnswerverifiedShow Answer

Which of the following could be used to prepare myristic acid,CH3(CH2) 12COOH?

Correct AnswerverifiedShow Answer

Which of these is a detergent?

Correct AnswerverifiedShow Answer

Which is not a correct statement concerning naturally occurring triacylglycerols?

Correct AnswerverifiedShow Answer

How many stereogenic centers are there in cholesterol?

Correct AnswerverifiedShow Answer

The product of the following reaction sequence is nervonic acid.What is the structure of nervonic acid?

Correct AnswerverifiedB

Myelin,the protective coating around nerve fibers,is made up of ___.

Correct Answerverifiedsphingolip...View AnswerShow Answer

The synthesis of cortisone required placing a ketone function at the 11-position of a steroid.Where is position 11?

Correct AnswerverifiedShow Answer

How could you synthesize stearolic acid,CH3(CH2) 7C=C(CH2) 7COOH from oleic acid,CH3(CH2) 7CH=CH(CH2) 7COOH?

Correct AnswerverifiedShow Answer

Which of the following statements regarding triacylglycerols is not true?

Correct AnswerverifiedShow Answer

Salts of long-chain fatty acids are known as ___.

Correct AnswerverifiedShow Answer

What is a mixed triacylglycerol?

Correct AnswerverifiedShow Answer

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11eaa4bc_3e46_903e_9180_67d4a7a153f3_TB5902_00 All substituents are equatorial.

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E

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Rank the following fatty acids according to increasing melting point. I: CH₃(CH₂) ₁₆CO₂H II: CH₃(CH₂) ₇CH=CH(CH₂) ₇CO₂H (cis) III: CH₃(CH₂) ₇CH=CH(CH₂) ₇CO₂H (trans) IV: HO₂C(CH₂) ₇CH=CHCH₂CH=CH(CH₂) ₇CH₃(cis,cis)

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Which of the following could be used to prepare myristic acid,CH₃(CH₂) ₁₂COOH?

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B

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sphingolip...
View Answer

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How could you synthesize stearolic acid,CH₃(CH₂) ₇C=C(CH₂) ₇COOH from oleic acid,CH₃(CH₂) ₇CH=CH(CH₂) ₇COOH?

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