Question 1

Which of the following is NOT a function of lipids in the human body?

Accepted Answer

A)  energy storage 
B)  insulation 
C)  protection 
D)  emulsification 
E)  pH regulation 
A)  energy storage 
B)  insulation 
C)  protection 
D)  emulsification 
E)  pH regulation E

Question 2

In a simple model of atherosclerosis and heart disease, the compound that forms plaques that adhere to the walls of the blood vessels is __________.

Accepted Answer

A)  cholesterol 
B)  carnauba wax 
C)  stearic acid 
D)  glycerol 
E)  sphingosine 
A)  cholesterol 
B)  carnauba wax 
C)  stearic acid 
D)  glycerol 
E)  sphingosine A

Question 3

The main lipid components in cellular membranes are

Accepted Answer

A)  glycerolphospholipids. 
B)  terpenes. 
C)  steroids. 
D)  triacylglycerols. 
E)  waxes. 
A)  glycerolphospholipids. 
B)  terpenes. 
C)  steroids. 
D)  triacylglycerols. 
E)  waxes. A

Question 4

Oleic acid is an unsaturated fatty acid.

Accepted Answer

A) True 
 B)False

Question 5

A double cheeseburger with bacon contains 640 kcal and 39 g of fat. Calculate the percentage of total kilocalories due to fat (1 gram of fat = 9 kcal).

Accepted Answer

A)  0.68% of total kilocalories 
B)  6.1% of total kilocalories 
C)  11% of total kilocalories 
D)  55% of total kilocalories 
E)  100% of total kilocalories 
A)  0.68% of total kilocalories 
B)  6.1% of total kilocalories 
C)  11% of total kilocalories 
D)  55% of total kilocalories 
E)  100% of total kilocalories

Question 6

A double cheeseburger with bacon contains 640 kcal and 39 g of fat. Calculate the number of kilocalories from fat. (1 gram of fat = 9 kcal; 1 gram of carbohydrate or protein delivers 4 kcal.)

Accepted Answer

A)  4.3 kcal from fat 
B)  39 kcal from fat 
C)  71 kcal from fat 
D)  350 kcal from fat 
E)  640 kcal from fat 
A)  4.3 kcal from fat 
B)  39 kcal from fat 
C)  71 kcal from fat 
D)  350 kcal from fat 
E)  640 kcal from fat

Question 7

DNA is a lipid.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following is an unsaturated fatty acid?

Accepted Answer

A)  myristic 
B)  oleic 
C)  palmitic 
D)  stearic 
E)  lauric 
A)  myristic 
B)  oleic 
C)  palmitic 
D)  stearic 
E)  lauric

Question 9

Many sex hormones are steroids.

Accepted Answer

A) True 
 B)False

Question 10

Channel proteins in cell membranes serve what function?

Accepted Answer

A)  They add strength and rigidity to the membrane. 
B)  They provide pathways for water and electrolytes to move through cell membranes. 
C)  They form the bilayer portion of the membrane. 
D)  They allow nonpolar substances to move through the membrane. 
E)  They prevent interactions between the nonpolar tails of the phospholipids which gives the membrane its fluidity. 
A)  They add strength and rigidity to the membrane. 
B)  They provide pathways for water and electrolytes to move through cell membranes. 
C)  They form the bilayer portion of the membrane. 
D)  They allow nonpolar substances to move through the membrane. 
E)  They prevent interactions between the nonpolar tails of the phospholipids which gives the membrane its fluidity.

Question 11

In the fluid-mosaic model that describes plasma membranes,

Accepted Answer

A)  there are three layers of glycerophospholipid molecules. 
B)  two layers of glycerophospholipid molecules have their nonpolar sections oriented to the inside of the membrane. 
C)  two layers of glycerophospholipid molecules have their nonpolar sections along the outer surface of the membrane. 
D)  A single row of glycerophospholipid molecules forms a barrier between the inside and outside of the cell. 
E)  two layers of proteins separate the contents inside a cell from the surrounding fluids. 
A)  there are three layers of glycerophospholipid molecules. 
B)  two layers of glycerophospholipid molecules have their nonpolar sections oriented to the inside of the membrane. 
C)  two layers of glycerophospholipid molecules have their nonpolar sections along the outer surface of the membrane. 
D)  A single row of glycerophospholipid molecules forms a barrier between the inside and outside of the cell. 
E)  two layers of proteins separate the contents inside a cell from the surrounding fluids.

Question 12

For the question(s) that follow, identify the class of lipid to which each of the following molecules belongs.
-

Accepted Answer

A)  sphingolipid 
B)  simple lipid 
C)  bile salt 
D)  triacylglycerol 
E)  prostaglandin 
A)  sphingolipid 
B)  simple lipid 
C)  bile salt 
D)  triacylglycerol 
E)  prostaglandin

Question 13

The name of the reaction that occurs when a fat reacts with sodium hydroxide and water is __________.

Accepted Answer

A)  hydrogenation 
B)  reduction 
C)  hydration 
D)  oxidation 
E)  saponification 
A)  hydrogenation 
B)  reduction 
C)  hydration 
D)  oxidation 
E)  saponification

Question 14

Cholesterol belongs to the __________ group of lipids.

Accepted Answer

A)  phospholipid 
B)  steroid 
C)  prostaglandin 
D)  triacylglycerol 
E)  wax 
A)  phospholipid 
B)  steroid 
C)  prostaglandin 
D)  triacylglycerol 
E)  wax

Question 15

For the question(s) that follow, identify the class of lipid to which each of the following molecules belongs.
-

Accepted Answer

A)  steroid 
B)  glycerophospholipid 
C)  wax 
D)  bile salt 
E)  prostaglandin 
A)  steroid 
B)  glycerophospholipid 
C)  wax 
D)  bile salt 
E)  prostaglandin

Question 16

A precursor of prostaglandins is __________ acid.

Accepted Answer

A)  oleic 
B)  linoleic 
C)  arachidonic 
D)  tauric 
E)  palmitic 
A)  oleic 
B)  linoleic 
C)  arachidonic 
D)  tauric 
E)  palmitic

Question 17

Answer the question(s) that follow about the diagram shown below.  
-In this diagram of a cell membrane, the objects labeled (E) are

Accepted Answer

A)  steroids. 
B)  hydrophobic regions. 
C)  proteins. 
D)  phospholipids. 
E)  carbohydrate side chains. 
A)  steroids. 
B)  hydrophobic regions. 
C)  proteins. 
D)  phospholipids. 
E)  carbohydrate side chains.

Question 18

Unsaturated fatty acids have lower melting points than saturated fatty acids because

Accepted Answer

A)  they have fewer hydrogen atoms. 
B)  they have more hydrogen atoms. 
C)  their molecules fit closely together. 
D)  the cis double bonds give them an irregular shape. 
E)  the trans double bonds give them an irregular shape. 
A)  they have fewer hydrogen atoms. 
B)  they have more hydrogen atoms. 
C)  their molecules fit closely together. 
D)  the cis double bonds give them an irregular shape. 
E)  the trans double bonds give them an irregular shape.

Question 19

Palmitic acid is a 16 carbon acid. In a balanced equation, the products of the saponification of glyceryl tripalmitate (tripalmitin) are

Accepted Answer

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

Question 20

Choose the saturated triacylglycerol from the compounds below.

Accepted Answer

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

Exam 17: Lipids

Which of the following is NOT a function of lipids in the human body?

In a simple model of atherosclerosis and heart disease, the compound that forms plaques that adhere to the walls of the blood vessels is __________.

The main lipid components in cellular membranes are

Oleic acid is an unsaturated fatty acid.

A double cheeseburger with bacon contains 640 kcal and 39 g of fat. Calculate the percentage of total kilocalories due to fat (1 gram of fat = 9 kcal).

A double cheeseburger with bacon contains 640 kcal and 39 g of fat. Calculate the number of kilocalories from fat. (1 gram of fat = 9 kcal; 1 gram of carbohydrate or protein delivers 4 kcal.)

DNA is a lipid.

Which of the following is an unsaturated fatty acid?

Many sex hormones are steroids.

Channel proteins in cell membranes serve what function?

In the fluid-mosaic model that describes plasma membranes,

For the question(s) that follow, identify the class of lipid to which each of the following molecules belongs. -

The name of the reaction that occurs when a fat reacts with sodium hydroxide and water is __________.

Cholesterol belongs to the __________ group of lipids.

For the question(s) that follow, identify the class of lipid to which each of the following molecules belongs. -

A precursor of prostaglandins is __________ acid.

Answer the question(s) that follow about the diagram shown below. -In this diagram of a cell membrane, the objects labeled (E) are

Unsaturated fatty acids have lower melting points than saturated fatty acids because

Palmitic acid is a 16 carbon acid. In a balanced equation, the products of the saponification of glyceryl tripalmitate (tripalmitin) are

Choose the saturated triacylglycerol from the compounds below.

Chemistry and Measurements

Energy and Matter

Atoms and Elements

Nuclear Chemistry

Compounds and Their Bonds

Chemical Reactions and Quantities

Gases

Solutions

Reaction Rates and Chemical Equilibrium

Acids and Bases

Introduction to Organic Chemistry: Alkanes

Alkenes, Alkynes, and Aromatic Compounds

Alcohols, Phenols, Thiols, and Ethers

Aldehydes, Ketones, and Chiral Molecules

Carbohydrates

Carboxylic Acids and Esters

Amines and Amides

Amino Acids and Proteins

Enzymes and Vitamins

Nucleic Acids and Protein Synthesis

Metabolic Pathways for Carbohydrates

Metabolism and Energy Production

Metabolic Pathways for Lipids and Amino Acids

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