Question 1

Which of the following statements best explains the insolubility of lipids in water?

Accepted Answer

A)  The structure of lipids includes hydrophilic molecules. 
B)  The polar portion of lipids is much larger than the nonpolar portion. 
C)  The polar portion of lipids is much smaller than the nonpolar portion. 
D)  The polar and nonpolar portions of lipids are of the same size. 
A)  The structure of lipids includes hydrophilic molecules. 
B)  The polar portion of lipids is much larger than the nonpolar portion. 
C)  The polar portion of lipids is much smaller than the nonpolar portion. 
D)  The polar and nonpolar portions of lipids are of the same size.

Question 2

Which of the following is associated with thromboxanes?

Accepted Answer

A)  elevation of pain 
B)  aggregation of platelets 
C)  reduction of fever 
D)  all of these 
A)  elevation of pain 
B)  aggregation of platelets 
C)  reduction of fever 
D)  all of these

Question 3

Where does the synthesis of cholesterol occur in the body?

Accepted Answer

A)  in the liver 
B)  in the pancreas 
C)  in the spleen 
D)  in the thyroid 
A)  in the liver 
B)  in the pancreas 
C)  in the spleen 
D)  in the thyroid

Question 4

Which of the following conditions is associated with Gaucher's disease?

Accepted Answer

A)  an inability to synthesize glucocerebrosides 
B)  an inability to store sufficient glucocerebrosides 
C)  an overaccumulation of glucocerebrosides 
D)  any of these, depending on the patient 
A)  an inability to synthesize glucocerebrosides 
B)  an inability to store sufficient glucocerebrosides 
C)  an overaccumulation of glucocerebrosides 
D)  any of these, depending on the patient

Question 5

If a triglyceride contains linoleic, linolenic, and stearic acids, then how many moles of hydrogen are required to fully hydrogenate one mole of this triglyceride?

Accepted Answer

A)  3 
B)  4 
C)  5 
D)  6 
A)  3 
B)  4 
C)  5 
D)  6

Question 6

Which of the following best describes the function of bile salts?

Accepted Answer

A)  They are detergents. 
B)  They are lachrymators. 
C)  They are oxidizing agents. 
D)  None of these are functions of bile salts. 
A)  They are detergents. 
B)  They are lachrymators. 
C)  They are oxidizing agents. 
D)  None of these are functions of bile salts.

Question 7

Which of the following is true of all glycerophospholipids?

Accepted Answer

A)  They are composed of only saturated fatty acids. 
B)  They are composed of only unsaturated fatty acids. 
C)  Their backbone is composed of the trihydric alcohol glycerol. 
D)  Their third group is esterified by a nitrate group, which is also esterified to an alcohol. 
A)  They are composed of only saturated fatty acids. 
B)  They are composed of only unsaturated fatty acids. 
C)  Their backbone is composed of the trihydric alcohol glycerol. 
D)  Their third group is esterified by a nitrate group, which is also esterified to an alcohol.

Question 8

Which class of glycerophospholipids can serve as signaling molecules when phosphorylated?

Accepted Answer

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

Question 9

Which of the following represents the correct sequence of the synthesis of steroid hormones?

Accepted Answer

A)  cholesterol → progesterone → cortisone → cortisol 
B)  cholesterol → progesterone → cortisone → aldosterone 
C)  cholesterol → progesterone → estradiol → testosterone 
D)  none of these 
A)  cholesterol → progesterone → cortisone → cortisol 
B)  cholesterol → progesterone → cortisone → aldosterone 
C)  cholesterol → progesterone → estradiol → testosterone 
D)  none of these

Question 10

Which of the following statements correctly describes the functions of COX-1 and COX-2?

Accepted Answer

A)  Both COX-1 and COX-2 are involved in the normal physiological production of prostaglandins. 
B)  Both COX-1 and COX-2 promote the production of prostaglandins in response to inflammation. 
C)  COX-1 promotes the production of prostaglandins in response to inflammation, whereas COX-2 catalyzes the normal physiological production of prostaglandins. 
D)  COX-1 catalyzes the normal physiological production of prostaglandins, whereas COX-2 promotes the production of prostaglandins in response to inflammation. 
A)  Both COX-1 and COX-2 are involved in the normal physiological production of prostaglandins. 
B)  Both COX-1 and COX-2 promote the production of prostaglandins in response to inflammation. 
C)  COX-1 promotes the production of prostaglandins in response to inflammation, whereas COX-2 catalyzes the normal physiological production of prostaglandins. 
D)  COX-1 catalyzes the normal physiological production of prostaglandins, whereas COX-2 promotes the production of prostaglandins in response to inflammation.

Question 11

Which of the following lipoproteins are commonly called "bad cholesterol"?

Accepted Answer

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

Question 12

Which of the following is involved in the conversion of testosterone to estradiol?

Accepted Answer

A)  the conversion of an alcohol to a ketone followed by the loss of -H and of -CH3 
B)  the conversion of a ketone to an alcohol followed by the loss of -H and of -CH3 
C)  the loss of -H and of -CH3 followed by the conversion of an alcohol to a ketone 
D)  the loss of -H and of -CH3 followed by keto-enol tautomerism 
A)  the conversion of an alcohol to a ketone followed by the loss of -H and of -CH3 
B)  the conversion of a ketone to an alcohol followed by the loss of -H and of -CH3 
C)  the loss of -H and of -CH3 followed by the conversion of an alcohol to a ketone 
D)  the loss of -H and of -CH3 followed by keto-enol tautomerism

Question 13

Examine the following structure.   Which number in the diagram represents an ester linkage?

Accepted Answer

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

Question 14

In addition to fatty acids, which of the following compounds is found in triglycerides?

Accepted Answer

A)  glycol 
B)  glycerol 
C)  acetone 
D)  propanone 
A)  glycol 
B)  glycerol 
C)  acetone 
D)  propanone

Question 15

Which of the following is found in cephalins?

Accepted Answer

A)  choline 
B)  ethanolamine 
C)  inositol 
D)  none of these 
A)  choline 
B)  ethanolamine 
C)  inositol 
D)  none of these

Question 16

Which of the following digestive processes requires bile salts?

Accepted Answer

A)  the digestion of dietary lipids 
B)  the digestion of dietary carbohydrates 
C)  the digestion of dietary proteins 
D)  the digestion of dietary vitamins 
A)  the digestion of dietary lipids 
B)  the digestion of dietary carbohydrates 
C)  the digestion of dietary proteins 
D)  the digestion of dietary vitamins

Question 17

Examine the following triglyceride.   If this triglyceride is subjected to hydrogenation, how many moles of H2 will be consumed per mole of this reactant?

Accepted Answer

A)  1 mol 
B)  2 mol 
C)  3 mol 
D)  4 mol 
E)  This triglyceride will not react with H2. 
A)  1 mol 
B)  2 mol 
C)  3 mol 
D)  4 mol 
E)  This triglyceride will not react with H2.

Question 18

Which of the following statements is true of membrane proteins?

Accepted Answer

A)  They are suspended on the surface of the membrane. 
B)  They are partly embedded in the bilayer. 
C)  They span across the bilayer and project from both sides. 
D)  Any of these are true, depending on the specific membrane protein. 
A)  They are suspended on the surface of the membrane. 
B)  They are partly embedded in the bilayer. 
C)  They span across the bilayer and project from both sides. 
D)  Any of these are true, depending on the specific membrane protein.

Question 19

Which of the following are primary messengers?

Accepted Answer

A)  prostaglandins 
B)  steroid hormones 
C)  thromboxanes 
D)  all of these 
A)  prostaglandins 
B)  steroid hormones 
C)  thromboxanes 
D)  all of these

Question 20

Which of the following linkages is found between a glucose unit and the ceramide portion of a cerebroside?

Accepted Answer

A)  α-1-fructosidic 
B)  β-1-fructosidic 
C)  α-1-glycosidic 
D)  β-1-glycosidic 
A)  α-1-fructosidic 
B)  β-1-fructosidic 
C)  α-1-glycosidic 
D)  β-1-glycosidic

Exam 20: Lipids

Which of the following statements best explains the insolubility of lipids in water?

Which of the following is associated with thromboxanes?

Where does the synthesis of cholesterol occur in the body?

Which of the following conditions is associated with Gaucher's disease?

If a triglyceride contains linoleic, linolenic, and stearic acids, then how many moles of hydrogen are required to fully hydrogenate one mole of this triglyceride?

Which of the following best describes the function of bile salts?

Which of the following is true of all glycerophospholipids?

Which class of glycerophospholipids can serve as signaling molecules when phosphorylated?

Which of the following represents the correct sequence of the synthesis of steroid hormones?

Which of the following statements correctly describes the functions of COX-1 and COX-2?

Which of the following lipoproteins are commonly called "bad cholesterol"?

Which of the following is involved in the conversion of testosterone to estradiol?

Examine the following structure. Which number in the diagram represents an ester linkage?

In addition to fatty acids, which of the following compounds is found in triglycerides?

Which of the following is found in cephalins?

Which of the following digestive processes requires bile salts?

Examine the following triglyceride. If this triglyceride is subjected to hydrogenation, how many moles of H2 will be consumed per mole of this reactant?

Which of the following statements is true of membrane proteins?

Which of the following are primary messengers?

Which of the following linkages is found between a glucose unit and the ceramide portion of a cerebroside?

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

Examine the following triglyceride. If this triglyceride is subjected to hydrogenation, how many moles of H₂ will be consumed per mole of this reactant?