Question 1

Which lipid is found in egg yolks and soybeans and is used as an emulsifying agent in ice cream?

Accepted Answer

A) sphingosine 
B) linoleic acid 
C) lecithin 
D) lauric acid 
E) Both lecithin and lauric acid are correct. 
A) sphingosine 
B) linoleic acid 
C) lecithin 
D) lauric acid 
E) Both lecithin and lauric acid are correct. C

Question 2

The product of the reaction of decanoic acid with n-propanol under acidic conditions is isopropyl decanoate.

Accepted Answer

A) True 
 B)False  False

Question 3

The structure of a phosphoglyceride is shown below.Phosphoglycerides can interact with both water and other lipids,and are therefore well suited for their role in the lipid bilayer of cell membranes.Which of the following best explains this behavior?

Accepted Answer

A) Phosphoglycerides contain a phosphate diester. 
B) Phosphoglycerides contain both hydrophobic and hydrophilic regions. 
C) Phosphoglycerides contain saturated fatty acids as well as unsaturated fatty acids. 
D) Phosphoglycerides contain both single bonds and double bonds between carbons. 
E) Phosphoglycerides contain omega-3 and omega-6 fatty acids. 
A) Phosphoglycerides contain a phosphate diester. 
B) Phosphoglycerides contain both hydrophobic and hydrophilic regions. 
C) Phosphoglycerides contain saturated fatty acids as well as unsaturated fatty acids. 
D) Phosphoglycerides contain both single bonds and double bonds between carbons. 
E) Phosphoglycerides contain omega-3 and omega-6 fatty acids. B

Question 4

One mole of oleic acid will react with two moles of hydrogen to form a mole of stearic acid.

Accepted Answer

A) True 
 B)False

Question 5

Phospholipids have a polar "head" and a nonpolar "tail."

Accepted Answer

A) True 
 B)False

Question 6

Which kind of eicosanoids is thought to promote certain aspects of the inflammatory response?

Accepted Answer

A) leukotrienes 
B) prostaglandins 
C) thromboxanes 
D) steroids 
E) fatty acids 
A) leukotrienes 
B) prostaglandins 
C) thromboxanes 
D) steroids 
E) fatty acids

Question 7

Which of the following substances are not found in lipoproteins?

Accepted Answer

A) phospholipids 
B) cholesterol 
C) starch 
D) proteins 
E) triglycerides 
A) phospholipids 
B) cholesterol 
C) starch 
D) proteins 
E) triglycerides

Question 8

Consider the compound represented below.Which of the following best describes it?

Accepted Answer

A) It is a nonpolar amino acid. 
B) It is a triglyceride. 
C) It is a soap. 
D) It is an unsaturated fatty acid. 
E) It is an omega-3 wax. 
A) It is a nonpolar amino acid. 
B) It is a triglyceride. 
C) It is a soap. 
D) It is an unsaturated fatty acid. 
E) It is an omega-3 wax.

Question 9

The ingredients on a box of cupcakes lists partially hydrogenated soybean oil.Partial hydrogenation of soybean oil has what effect?

Accepted Answer

A) It produces fatty acid salts from the triglycerides that are present. 
B) It decreases the percentage of unsaturation present in the fatty acid side chains. 
C) It hydrolyzes the triglycerides that are present. 
D) It increases the number of fatty acids present. 
E) It converts the soybean oil to butter. 
A) It produces fatty acid salts from the triglycerides that are present. 
B) It decreases the percentage of unsaturation present in the fatty acid side chains. 
C) It hydrolyzes the triglycerides that are present. 
D) It increases the number of fatty acids present. 
E) It converts the soybean oil to butter.

Question 10

Which class of human plasma lipoproteins carries triglycerides from the intestine to other tissues?

Accepted Answer

A) chylomicrons 
B) high density lipoproteins (HDL) 
C) low density lipoproteins (LDL) 
D) very low density lipoproteins (VLDL) 
E) sphingomyelins 
A) chylomicrons 
B) high density lipoproteins (HDL) 
C) low density lipoproteins (LDL) 
D) very low density lipoproteins (VLDL) 
E) sphingomyelins

Question 11

What two products are formed in the reaction between a fatty acid and an alcohol?

Accepted Answer

A) ester and hydrogen 
B) ester and water 
C) ether and water 
D) ether and hydrogen 
E) hydrogen and alkane 
A) ester and hydrogen 
B) ester and water 
C) ether and water 
D) ether and hydrogen 
E) hydrogen and alkane

Question 12

How does the melting point of an unsaturated fatty acid compare to that of a saturated fatty acid with an equal number of carbon atoms?

Accepted Answer

A) The melting point of the unsaturated fatty acid will be higher than that of the saturated fatty acid. 
B) The melting point of the unsaturated fatty acid will be lower than that of the saturated fatty acid. 
C) The melting point of the unsaturated fatty acid will be the same as that of the saturated fatty acid. 
D) It is impossible to predict without additional information. 
E) Fatty acids do not have melting points because they are liquids at room temperature. 
A) The melting point of the unsaturated fatty acid will be higher than that of the saturated fatty acid. 
B) The melting point of the unsaturated fatty acid will be lower than that of the saturated fatty acid. 
C) The melting point of the unsaturated fatty acid will be the same as that of the saturated fatty acid. 
D) It is impossible to predict without additional information. 
E) Fatty acids do not have melting points because they are liquids at room temperature.

Question 13

What is the general term for lipids synthesized from isoprene units?

Accepted Answer

A) cholesterol 
B) waxes 
C) chylomicrons 
D) terpenes 
E) high density lipoproteins 
A) cholesterol 
B) waxes 
C) chylomicrons 
D) terpenes 
E) high density lipoproteins

Question 14

Which statement concerning the structure of a fatty acid is FALSE?

Accepted Answer

A) Fatty acids are naturally occurring,long-chain carboxylic acids. 
B) The carbon chain in a fatty acid may be branched or unbranched. 
C) Fatty acids generally contain an even number of carbon atoms. 
D) The carbon chain in a fatty acid may be saturated or unsaturated. 
E) When present in fatty acids,C=C bonds are usually cis. 
A) Fatty acids are naturally occurring,long-chain carboxylic acids. 
B) The carbon chain in a fatty acid may be branched or unbranched. 
C) Fatty acids generally contain an even number of carbon atoms. 
D) The carbon chain in a fatty acid may be saturated or unsaturated. 
E) When present in fatty acids,C=C bonds are usually cis.

Question 15

Which lipid hormones allow tissues of the body to communicate with one another?

Accepted Answer

A) steroids 
B) lipoproteins 
C) enzymes 
D) arachidonates 
E) prostaglandins 
A) steroids 
B) lipoproteins 
C) enzymes 
D) arachidonates 
E) prostaglandins

Question 16

Saponification of the triglyceride shown below produces soap.What is the structure of the soap?

Accepted Answer

A) Na+ −O(CH2)10CH3 
B) 
  
C) 
  
D) 
  
E) 
  
A) Na+ −O(CH2)10CH3 
B) 
  
C) 
  
D) 
  
E)

Question 17

The most abundant lipids found in membranes are the phosphoglycerides.

Accepted Answer

A) True 
 B)False

Question 18

A tube of lipstick lists capric triglyceride among its ingredients.Capric triglyceride is a simple triglyceride containing capric acid,a 10-carbon saturated fatty acid.What is the structure of capric triglyceride?

Accepted Answer

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

Question 19

Dietary fats and oils are structurally both triglycerides,but fats are solids and oils are liquids at room temperature.Which of the following best describes the reason for their difference in physical state?

Accepted Answer

A) Fats contain 3 identical fatty acid R groups and oils contain different R groups. 
B) Oils contain 3 identical fatty acid R groups and fats contain different R groups. 
C) Oils contain longer fatty acid R groups than fats do. 
D) Fats contain more hydroxyl groups in their fatty acid R groups than oils do. 
E) Oils contain a higher percentage of unsaturation in their fatty acid R groups than fats do. 
A) Fats contain 3 identical fatty acid R groups and oils contain different R groups. 
B) Oils contain 3 identical fatty acid R groups and fats contain different R groups. 
C) Oils contain longer fatty acid R groups than fats do. 
D) Fats contain more hydroxyl groups in their fatty acid R groups than oils do. 
E) Oils contain a higher percentage of unsaturation in their fatty acid R groups than fats do.

Question 20

When three fatty acids react with glycerol,a lipid known as a triglyceride is formed.How are the fatty acids bonded to glycerol?

Accepted Answer

A) by amide bonds 
B) by ester bonds 
C) by glycosidic linkages 
D) by acetal bonds 
E) by hydrogen bonding 
A) by amide bonds 
B) by ester bonds 
C) by glycosidic linkages 
D) by acetal bonds 
E) by hydrogen bonding

Exam 17: Lipids and Their Functions in Biochemical Systems

Which lipid is found in egg yolks and soybeans and is used as an emulsifying agent in ice cream?

The product of the reaction of decanoic acid with n-propanol under acidic conditions is isopropyl decanoate.

The structure of a phosphoglyceride is shown below.Phosphoglycerides can interact with both water and other lipids,and are therefore well suited for their role in the lipid bilayer of cell membranes.Which of the following best explains this behavior?

One mole of oleic acid will react with two moles of hydrogen to form a mole of stearic acid.

Phospholipids have a polar "head" and a nonpolar "tail."

Which kind of eicosanoids is thought to promote certain aspects of the inflammatory response?

Which of the following substances are not found in lipoproteins?

Consider the compound represented below.Which of the following best describes it?

The ingredients on a box of cupcakes lists partially hydrogenated soybean oil.Partial hydrogenation of soybean oil has what effect?

Which class of human plasma lipoproteins carries triglycerides from the intestine to other tissues?

What two products are formed in the reaction between a fatty acid and an alcohol?

How does the melting point of an unsaturated fatty acid compare to that of a saturated fatty acid with an equal number of carbon atoms?

What is the general term for lipids synthesized from isoprene units?

Which statement concerning the structure of a fatty acid is FALSE?

Which lipid hormones allow tissues of the body to communicate with one another?

Saponification of the triglyceride shown below produces soap.What is the structure of the soap?

The most abundant lipids found in membranes are the phosphoglycerides.

A tube of lipstick lists capric triglyceride among its ingredients.Capric triglyceride is a simple triglyceride containing capric acid,a 10-carbon saturated fatty acid.What is the structure of capric triglyceride?

Dietary fats and oils are structurally both triglycerides,but fats are solids and oils are liquids at room temperature.Which of the following best describes the reason for their difference in physical state?

When three fatty acids react with glycerol,a lipid known as a triglyceride is formed.How are the fatty acids bonded to glycerol?

Chemistry - Methods and Measurement

The Structure of the Atom and the Periodic Table

Structure and Properties of Ionic and Covalent Compounds

Calculations, chemical Changes, and the Chemical Equation

States of Matter: Gases, liquids, and Solids

Solutions

Energy,rate and Equilibrium

Acids and Bases

The Nucleus, radioactivity, and Nuclear Medicine

An Introduction to Organic Chemistry

The Unsaturated Hydrocarbons: Alkenes, alkynes, and Aromatics

Alcohols, phenols, thiols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Carboxylic Acid Derivatives

Amines and Amides

Carbohydrates

Protein Structure and Function

Enzymes

Introduction to Molecular Genetics

Carbohydrate Metabolism

Aerobic Respiration and Energy Production

Fatty Acid Metabolism

Filters