Question 1

Which statement is not true?

Accepted Answer

A) Cholesterol is the most prominent member of the steroid family. 
B) Cholesterol is insoluble in the aqueous medium of the blood. 
C) Cholesterol serves as the starting material for the synthesis of all other steroids. 
D) Cholesterol is a vital component for healthy cell membranes. 
E) Cholesterol cannot be synthesized in the body,and therefore is required in the diet. 
A) Cholesterol is the most prominent member of the steroid family. 
B) Cholesterol is insoluble in the aqueous medium of the blood. 
C) Cholesterol serves as the starting material for the synthesis of all other steroids. 
D) Cholesterol is a vital component for healthy cell membranes. 
E) Cholesterol cannot be synthesized in the body,and therefore is required in the diet.

Question 2

Prostaglandins and leukotrienes are two types of ________.

Accepted Answer

A) low-density lipoproteins 
B) eicosanoids 
C) fat-soluble vitamins 
D) adrenal cortical steroids 
A) low-density lipoproteins 
B) eicosanoids 
C) fat-soluble vitamins 
D) adrenal cortical steroids

Question 3

Aldosterone regulates blood pressure and volume by controlling the concentration of Na+ and K+ in body fluids.

Accepted Answer

A) True 
 B)False

Question 4

The compound below is a mixed triacylglycerol formed from oleic,stearic,and palmitic acids.

Accepted Answer

A) True 
 B)False

Question 5

As the number of double bonds in a fatty acid increases,the melting point ________.

Accepted Answer

The answer of As the number of double bonds in...

Question 6

When phospholipids are mixed with water,they assemble in an arrangement called a lipid bilayer,with the ionic heads oriented on the inside and the nonpolar tails on the outside.

Accepted Answer

A) True 
 B)False

Question 7

How many fatty acids are required to form a triacylglycerol?

Accepted Answer

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

Question 8

The structure shown below is an example of a trans fatty acid.

Accepted Answer

A) True 
 B)False

Question 9

Cetyl palmitate is a component of spermaceti wax isolated from the heads of sperm whales,and is used in cosmetics. In which solvent would cetyl palmitate be expected to have the greatest solubility?

Accepted Answer

A) Acetic acid 
B) Ethanol 
C) Hexane 
D) Water 
A) Acetic acid 
B) Ethanol 
C) Hexane 
D) Water

Question 10

The molecule below is an omega-9 fatty acid.

Accepted Answer

A) True 
 B)False

Question 11

Unsaturated fatty acids are sometimes classified as omega-n acids,where n is the carbon at which the first double bond occurs in the carbon chain,beginning at the end of the chain that contains the CH3 group.

Accepted Answer

A) True 
 B)False

Question 12

Triacylglycerols are stored in ________ cells below the skin and concentrated in some regions of the body.

Accepted Answer

The answer of Triacylglycerols are stored in ________ cells below...

Question 13

Which statement concerning lipid functions is incorrect?

Accepted Answer

A) Steroid hormones act as messenger molecules and regulate biochemical processes. 
B) Phospholipids,glycolipids,and cholesterol provide structure for cell membranes. 
C) Triacylglycerols are used for long term energy storage. 
D) Plants and animals use waxes for insulation. 
A) Steroid hormones act as messenger molecules and regulate biochemical processes. 
B) Phospholipids,glycolipids,and cholesterol provide structure for cell membranes. 
C) Triacylglycerols are used for long term energy storage. 
D) Plants and animals use waxes for insulation.

Question 14

The most common unsaturated fatty acids are palmitic and stearic acid.

Accepted Answer

A) True 
 B)False

Question 15

The compound below is an example of a simple triacylglycerol.

Accepted Answer

A) True 
 B)False

Question 16

The coating that surrounds and insulates nerve cells,the myelin sheath,is particularly rich in sphingomyelins,and is vital for proper nerve function.

Accepted Answer

A) True 
 B)False

Question 17

Which lipid has the lowest melting point?

Accepted Answer

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

Question 18

Testosterone (structure shown)is an androgen that control the development of secondary sex characteristics in males. Which of the following functional groups is not present in testosterone?

Accepted Answer

A) Ketone 
B) Carboxylic acid 
C) Alcohol 
D) Alkene 
A) Ketone 
B) Carboxylic acid 
C) Alcohol 
D) Alkene

Question 19

Although biofuels are prepared from renewable resources such as vegetable oils and animal fats,they still burn to form CO2,a gas that contributes to global warming.

Accepted Answer

A) True 
 B)False

Question 20

The fatty acid shown below will be a solid at room temperature.

Accepted Answer

A) True 
 B)False

Exam 19: Lipids

Which statement is not true?

Prostaglandins and leukotrienes are two types of ________.

Aldosterone regulates blood pressure and volume by controlling the concentration of Na+ and K+ in body fluids.

The compound below is a mixed triacylglycerol formed from oleic,stearic,and palmitic acids.

As the number of double bonds in a fatty acid increases,the melting point ________.

When phospholipids are mixed with water,they assemble in an arrangement called a lipid bilayer,with the ionic heads oriented on the inside and the nonpolar tails on the outside.

How many fatty acids are required to form a triacylglycerol?

The structure shown below is an example of a trans fatty acid.

Cetyl palmitate is a component of spermaceti wax isolated from the heads of sperm whales,and is used in cosmetics. In which solvent would cetyl palmitate be expected to have the greatest solubility?

The molecule below is an omega-9 fatty acid.

Unsaturated fatty acids are sometimes classified as omega-n acids,where n is the carbon at which the first double bond occurs in the carbon chain,beginning at the end of the chain that contains the CH3 group.

Triacylglycerols are stored in ________ cells below the skin and concentrated in some regions of the body.

Which statement concerning lipid functions is incorrect?

The most common unsaturated fatty acids are palmitic and stearic acid.

The compound below is an example of a simple triacylglycerol.

The coating that surrounds and insulates nerve cells,the myelin sheath,is particularly rich in sphingomyelins,and is vital for proper nerve function.

Which lipid has the lowest melting point?

Testosterone (structure shown)is an androgen that control the development of secondary sex characteristics in males. Which of the following functional groups is not present in testosterone?

Although biofuels are prepared from renewable resources such as vegetable oils and animal fats,they still burn to form CO2,a gas that contributes to global warming.

The fatty acid shown below will be a solid at room temperature.

Matter and Measurement

Atoms and the Periodic Table

Ionic Compounds

Covalent Compounds

Chemical Reactions

Energy Changes,reaction Rates,and Equilibrium

Gases,liquids,and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Molecules and Functional Groups

Alkanes

Unsaturated Hydrocarbons

Organic Compounds That Contain Oxygen,halogen,or Sulfur

The Three-Dimensional Shape of Molecules

Aldehydes and Ketones

Carboxylic Acids,esters,and Amides

Amines and Neurotransmitters

Carbohydrates

Amino Acids,proteins,and Enzymes

Nucleic Acids and Protein Synthesis

Metabolism and Energy Production

Carbohydrate,lipid,and Protein Metabolism

Filters

Aldosterone regulates blood pressure and volume by controlling the concentration of Na⁺ and K⁺ in body fluids.

Unsaturated fatty acids are sometimes classified as omega-n acids,where n is the carbon at which the first double bond occurs in the carbon chain,beginning at the end of the chain that contains the CH₃ group.

Although biofuels are prepared from renewable resources such as vegetable oils and animal fats,they still burn to form CO₂,a gas that contributes to global warming.