Question 1

Which of the following is true of all lecithins?

Accepted Answer

A)  They are composed of only saturated fatty acids. 
B)  They are composed of only unsaturated fatty acids. 
C)  They always have a choline group in carbon 3 of the glycerol backbone. 
D)  They always have an unsaturated fatty acid bound to carbon 1 of the glycerol backbone. 
A)  They are composed of only saturated fatty acids. 
B)  They are composed of only unsaturated fatty acids. 
C)  They always have a choline group in carbon 3 of the glycerol backbone. 
D)  They always have an unsaturated fatty acid bound to carbon 1 of the glycerol backbone. C

Question 2

Why is coconut oil liquid at room temperature (77oF)?

Accepted Answer

A)  because of the presence of high amounts of unsaturated fatty acids 
B)  because of the presence of essential fatty acids 
C)  because of the presence of low-molecular-weight saturated fatty acids 
D)  because of the presence of high-molecular-weight saturated fatty acids 
A)  because of the presence of high amounts of unsaturated fatty acids 
B)  because of the presence of essential fatty acids 
C)  because of the presence of low-molecular-weight saturated fatty acids 
D)  because of the presence of high-molecular-weight saturated fatty acids C

Question 3

Which of the following is a naturally occurring unsaturated fatty acid?

Accepted Answer

A)  lauric acid 
B)  palmitic acid 
C)  linoleic acid 
D)  myristic acid 
A)  lauric acid 
B)  palmitic acid 
C)  linoleic acid 
D)  myristic acid C

Question 4

Which structural component of a bile salt is not present in a cholesterol molecule?

Accepted Answer

A)  a hydroxyl group at C-3 
B)  a methyl group at C-10 
C)  an amide linkage 
D)  none of these 
A)  a hydroxyl group at C-3 
B)  a methyl group at C-10 
C)  an amide linkage 
D)  none of these

Question 5

Which of the following statements is true of the fluid mosaic model of membranes?

Accepted Answer

A)  Membranes have proteins present only on the outer surface. 
B)  The complex lipids that make up membranes are distributed evenly. 
C)  The fluidity of membranes increases with an increase in unsaturated fatty acids. 
D)  It is impossible to determine the degree of fluidity of membranes. 
A)  Membranes have proteins present only on the outer surface. 
B)  The complex lipids that make up membranes are distributed evenly. 
C)  The fluidity of membranes increases with an increase in unsaturated fatty acids. 
D)  It is impossible to determine the degree of fluidity of membranes.

Question 6

Which of the following statements is true of anabolic steroids?

Accepted Answer

A)  They are illegal in sporting events. 
B)  They are effective when taken orally. 
C)  They increase muscle mass. 
D)  All of these are true. 
A)  They are illegal in sporting events. 
B)  They are effective when taken orally. 
C)  They increase muscle mass. 
D)  All of these are true.

Question 7

Which hormone inhibits ovulation once an ovum has been fertilized?

Accepted Answer

A)  estradiol 
B)  luteinizing hormone 
C)  progesterone 
D)  none of these 
A)  estradiol 
B)  luteinizing hormone 
C)  progesterone 
D)  none of these

Question 8

Which of the following statements is true of trans fats?

Accepted Answer

A)  They are produced by condensation reactions. 
B)  They tend to increase serum cholesterol if consumed in large amounts. 
C)  They are classified under "generally recognized as safe" compounds. 
D)  They are more common than their cis counterparts. 
A)  They are produced by condensation reactions. 
B)  They tend to increase serum cholesterol if consumed in large amounts. 
C)  They are classified under "generally recognized as safe" compounds. 
D)  They are more common than their cis counterparts.

Question 9

Which of the following is a function of unsaturated fatty acids in membranes?

Accepted Answer

A)  They provide fluidity to membranes and allow transport of biochemical products. 
B)  They provide a site for chemical reactions to occur. 
C)  Both of these are functions of unsaturated fatty acids. 
D)  None of these are functions of unsaturated fatty acids. 
A)  They provide fluidity to membranes and allow transport of biochemical products. 
B)  They provide a site for chemical reactions to occur. 
C)  Both of these are functions of unsaturated fatty acids. 
D)  None of these are functions of unsaturated fatty acids.

Question 10

In which part of the body do cerebrosides primarily occur?

Accepted Answer

A)  the brain 
B)  the intestines 
C)  bones 
D)  skeletal tissues 
A)  the brain 
B)  the intestines 
C)  bones 
D)  skeletal tissues

Question 11

What is the nature of the cholesterol found in cell membranes?

Accepted Answer

A)  amphipathic 
B)  hydrophobic 
C)  hydrophilic 
D)  amphiprotic 
A)  amphipathic 
B)  hydrophobic 
C)  hydrophilic 
D)  amphiprotic

Question 12

Which of the following statements is true of pure fats and oils?

Accepted Answer

A)  They have characteristic color but lack odor and taste. 
B)  They have characteristic odor but lack color and taste. 
C)  They have characteristic taste but lack odor and color. 
D)  They are colorless, odorless, and tasteless substances. 
A)  They have characteristic color but lack odor and taste. 
B)  They have characteristic odor but lack color and taste. 
C)  They have characteristic taste but lack odor and color. 
D)  They are colorless, odorless, and tasteless substances.

Question 13

Which of the following are glycerophospholipids?

Accepted Answer

A)  cephalins 
B)  lecithins 
C)  phosphatidylinositols 
D)  all of these 
A)  cephalins 
B)  lecithins 
C)  phosphatidylinositols 
D)  all of these

Question 14

What is the molecular formula of arachidic acid?

Accepted Answer

A)  CH3(CH2)15COOH 
B)  CH3(CH2)18COOH 
C)  CH3(CH2)10COOH 
D)  CH3(CH2)14COOH 
A)  CH3(CH2)15COOH 
B)  CH3(CH2)18COOH 
C)  CH3(CH2)10COOH 
D)  CH3(CH2)14COOH

Question 15

Examine the following structure.   Which number in the diagram represents the glycerol backbone of this structure?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 16

Which of the following is a glycolipid?

Accepted Answer

A)  ceramides 
B)  endorphins 
C)  enkephalins 
D)  none of these 
A)  ceramides 
B)  endorphins 
C)  enkephalins 
D)  none of these

Question 17

Which of the following lipoproteins have the highest percentage (dry weight) of triglycerides?

Accepted Answer

A)  chylomicrons 
B)  HDLs 
C)  LDLs 
D)  VLDLs 
A)  chylomicrons 
B)  HDLs 
C)  LDLs 
D)  VLDLs

Question 18

Which of the following are secondary messengers?

Accepted Answer

A)  prostaglandins 
B)  thromboxanes 
C)  both prostaglandins and thromboxanes 
D)  prostaglandins nor thromboxanes 
A)  prostaglandins 
B)  thromboxanes 
C)  both prostaglandins and thromboxanes 
D)  prostaglandins nor thromboxanes

Question 19

How many cyclohexane rings are present in a steroid structure?

Accepted Answer

A)  3 
B)  4 
C)  2 
D)  1 
A)  3 
B)  4 
C)  2 
D)  1

Question 20

Which of the following is an adrenocorticoid hormone?

Accepted Answer

A)  aldosterone 
B)  cortisol 
C)  cortisone 
D)  all of these 
A)  aldosterone 
B)  cortisol 
C)  cortisone 
D)  all of these

Exam 20: Lipids

Which of the following is true of all lecithins?

Why is coconut oil liquid at room temperature (77oF)?

Which of the following is a naturally occurring unsaturated fatty acid?

Which structural component of a bile salt is not present in a cholesterol molecule?

Which of the following statements is true of the fluid mosaic model of membranes?

Which of the following statements is true of anabolic steroids?

Which hormone inhibits ovulation once an ovum has been fertilized?

Which of the following statements is true of trans fats?

Which of the following is a function of unsaturated fatty acids in membranes?

In which part of the body do cerebrosides primarily occur?

What is the nature of the cholesterol found in cell membranes?

Which of the following statements is true of pure fats and oils?

Which of the following are glycerophospholipids?

What is the molecular formula of arachidic acid?

Examine the following structure. Which number in the diagram represents the glycerol backbone of this structure?

Which of the following is a glycolipid?

Which of the following lipoproteins have the highest percentage (dry weight) of triglycerides?

Which of the following are secondary messengers?

How many cyclohexane rings are present in a steroid structure?

Which of the following is an adrenocorticoid hormone?

Matter, Energy, and Measurement

Atoms

Chemical Bonds

Chemical Reactions

Gases, Liquids, and Solids

Solutions and Colloids

Reaction Rates and Chemical Equilibrium

Acids and Bases

Nuclear Chemistry

Organic Chemistry

Alkanes

Alkenes, Alkynes, and Aromatic Compounds

Alcohols, Ethers, and Thiols

Chirality: the Handedness of Molecules

Amines

Aldehydes and Ketones

Carboxylic Acids

Carboxylic Anhydrides, Esters, and Amides

Carbohydrates

Proteins

Enzymes

Chemical Communications: Neurotransmitters and Hormones

Nucleotides, Nucleic Acids, and Heredity

Gene Expression and Protein Synthesis

Bioenergetics: How the Body Converts Food to Energy

Specific Catabolic Pathways: Carbohydrate, Lipid, and Protein Metabolism

Biosynthetic Pathways

Nutrition

Immunochemistry

Body Fluids

Filters

Why is coconut oil liquid at room temperature (77^oF)?