Question 1

Which of the following is one of the products formed when the lipid below is saponified?

Accepted Answer

A)   
B)   
C)   
D)   E) None of the above
F) B) and C)

Question 2

The melting point of lauric acid, CH3(CH2) 10CO2H , is 43 °\degree° C and the melting point of stearic acid (CH3(CH2) 16CO2H)  is 69 °\degree° C. Which of the following statements best explains why the melting point of lauric acid is lower than the melting point of stearic acid?

Accepted Answer

A)   The hydrophobic tail of lauric acid is longer than the hydrophobic tail of stearic acid.
B)   Stearic acid is soluble in water and lauric acid is not soluble in water.
C)   Stearic acid is a fatty acid, whereas lauric acid is not a fatty acid.
D)   The London force interactions are stronger in stearic acid than they are in lauric acid. E) C) and D)
F) None of the above

Question 3

___ are used by both plants and animals as waterproofing.

Accepted Answer

The answer of ___ are used by both plants and...

Question 4

Lecithin is found in egg whites and can be used as an emulsifying agent to keep mayonnaise from separating. Lecithin is classified as a ___.

Accepted Answer

A)   phospholipid
B)   wax
C)   steroid
D)   glycolipidE) A) and D)
F) None of the above

Question 5

Anabolic steroids can cause some serious health problems including

Accepted Answer

A)   reduced circulation to the brain and liver.
B)   muscle atrophy and blocked arteries.
C)   high blood pressure and testicular atrophy.
D)   the interruption of nerve impulses and reduced intestinal function.E) C) and D)
F) B) and C)

Question 6

Matching
-Substance that can make or stabilize water insoluble substances as colloids.

Accepted Answer

A)   emulsifier
B)   facilitated diffusion
C)   lecithin
D)   leukotriene
E)   eicosanoidF)  active transportG)  waxH)  prostaglandinI)  cerebrosideJ)  saponificationK) D) and E)
L) A) and D)

Question 7

The steroid that is the raw material for the production of other steroids is

Accepted Answer

A)   triglyceride.
B)   cholesterol.
C)   progesterone.
D)   eicosanoid.E) A) and B)
F) A) and C)

Question 8

Waxes are compounds that are

Accepted Answer

A)   the result of the reaction of a fatty acid and sodium hydroxide.
B)   extremely hydrophilic due to the head end of the compound.
C)   mixtures of water insoluble compounds, especially esters.
D)   small compounds produced when short chain fatty acids react with an alcohol.E) B) and C)
F) A) and D)

Question 9

Shown below is the structure of the fatty acid, lauric acid:
 The boxed portion is considered to be both

Accepted Answer

A)   hydrophilic and hydrophobic.
B)   polar and hydrophobic.
C)   polar and hydrophilic.
D)   nonpolar and hydrophilic.E) C) and D)
F) B) and D)

Question 10

The following sketch is a structure of a compound.
  
a) Is this a saponifiable or nonsaponifiable lipid?
b) Circle the unsaturated fatty acid chain.
c) Is this a triglyceride, phospholipid or glycolipid?

Accepted Answer

a) saponif...

Question 11

Which compounds are responsible for causing pain and inflammation?

Accepted Answer

A)   anabolic steroids
B)   adrenocorticoids
C)   prostaglandins
D)   leukotrienesE) A) and B)
F) All of the above

Question 12

Stearic acid is an 18 carbon saturated fatty acid.
a) sketch the structure of stearic acid
b) circle the hydrophilic region
c) underline the hydrophobic region

Accepted Answer

The answer of Stearic acid is an 18 carbon saturated...

Question 13

Because of the components that are found in phospholipids, the phospholipid molecules

Accepted Answer

A)   are long molecules with multiple polar points.
B)   have a head that is nonpolar, as is the tail.
C)   have a polar end and a nonpolar end.
D)   have two ends that are nonpolar with a polar middle.E) None of the above
F) C) and D)

Question 14

Testosterone is produced from arachidonic acid.

Accepted Answer

A) True 
 B)False

Question 15

The phosphate head group of phospholipids is ___ and is found on the ___ of a membrane's lipid bilayer.

Accepted Answer

A)   hydrophilic/inside
B)   hydrophilic/outside
C)   hydrophobic/inside
D)   hydrophobic/outsideE) A) and C)
F) A) and D)

Question 16

Matching
-An emulsifying agent found in egg white.

Accepted Answer

A)   emulsifier
B)   facilitated diffusion
C)   lecithin
D)   leukotriene
E)   eicosanoidF)  active transportG)  waxH)  prostaglandinI)  cerebrosideJ)  saponificationK) A) and C)
L) A) and F)

Question 17

The lipid hormones that are derived from arachidonic acid are the ___.

Accepted Answer

A)   arachidonics
B)   eicosanoids
C)   adrenocorticoid hormones
D)   sex hormonesE) All of the above
F) C) and D)

Question 18

A phospholipid contains a total of ___ fatty acid residues.

Accepted Answer

The answer of A phospholipid contains a total of ___...

Question 19

Some molecules and ions are transported across a membrane via ___, which requires energy.

Accepted Answer

A)   osmosis
B)   diffusion
C)   facillitated diffusion
D)   active transportE) C) and D)
F) B) and D)

Question 20

The thromboxanes are

Accepted Answer

A)   anabolics that may be involved in increasing blood pressure.
B)   eicosanoids that are involved in blood clotting.
C)   adrenocroticoids that aid in the activation of sex hormones.
D)   lipids that have the capacity to cause membranes to grow.E) A) and B)
F) None of the above

Exam 11: Lipids and Membranes

___ are used by both plants and animals as waterproofing.

Correct AnswerverifiedShow Answer

The phosphate head group of phospholipids is ___ and is found on the ___ of a membrane's lipid bilayer.

Correct AnswerverifiedShow Answer

Shown below is the structure of the fatty acid, lauric acid: The boxed portion is considered to be both

Correct AnswerverifiedShow Answer

Testosterone is produced from arachidonic acid.

Correct AnswerverifiedShow Answer

Matching -Substance that can make or stabilize water insoluble substances as colloids.

Correct AnswerverifiedShow Answer

The steroid that is the raw material for the production of other steroids is

Correct AnswerverifiedShow Answer

Waxes are compounds that are

Correct AnswerverifiedShow Answer

Anabolic steroids can cause some serious health problems including

Correct AnswerverifiedShow Answer

The following sketch is a structure of a compound. a) Is this a saponifiable or nonsaponifiable lipid? b) Circle the unsaturated fatty acid chain. c) Is this a triglyceride, phospholipid or glycolipid?

Correct Answerverifieda) saponif...View AnswerShow Answer

Some molecules and ions are transported across a membrane via ___, which requires energy.

Correct AnswerverifiedShow Answer

Stearic acid is an 18 carbon saturated fatty acid. a) sketch the structure of stearic acid b) circle the hydrophilic region c) underline the hydrophobic region

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Matching -An emulsifying agent found in egg white.

Correct AnswerverifiedShow Answer

The melting point of lauric acid, CH3(CH2) 10CO2H , is 43 °\degree° C and the melting point of stearic acid (CH3(CH2) 16CO2H) is 69 °\degree° C. Which of the following statements best explains why the melting point of lauric acid is lower than the melting point of stearic acid?

Correct AnswerverifiedShow Answer

Lecithin is found in egg whites and can be used as an emulsifying agent to keep mayonnaise from separating. Lecithin is classified as a ___.

Correct AnswerverifiedShow Answer

The thromboxanes are

Correct AnswerverifiedShow Answer

A phospholipid contains a total of ___ fatty acid residues.

Correct AnswerverifiedShow Answer

Which compounds are responsible for causing pain and inflammation?

Correct AnswerverifiedShow Answer

Because of the components that are found in phospholipids, the phospholipid molecules

Correct AnswerverifiedShow Answer

The lipid hormones that are derived from arachidonic acid are the ___.

Correct AnswerverifiedShow Answer

Which of the following is one of the products formed when the lipid below is saponified?

Correct AnswerverifiedShow Answer

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The phosphate head group of phospholipids is _ and is found on the _ of a membrane's lipid bilayer.

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a) saponif...
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The melting point of lauric acid, CH₃(CH₂) ₁₀CO₂H , is 43 $\degree$ C and the melting point of stearic acid (CH₃(CH₂) ₁₆CO₂H) is 69 $\degree$ C. Which of the following statements best explains why the melting point of lauric acid is lower than the melting point of stearic acid?

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