Question 1

Sketch a lipid bilayer and identify its hydrophobic and hydrophilic portions.

Accepted Answer

OOOOOOOOOOOOOO hydrophilic
||

Question 2

The chemical makeup of oils is

Accepted Answer

A) simple esters of long chain alcohols and fatty acids. 
B) esters of glycerol with three identical saturated fatty acids. 
C) esters of glycerol with three identical unsaturated fatty acids. 
D) esters of glycerol with three predominantly saturated fatty acids. 
E) esters of glycerol with three predominantly unsaturated fatty acids. 
A) simple esters of long chain alcohols and fatty acids. 
B) esters of glycerol with three identical saturated fatty acids. 
C) esters of glycerol with three identical unsaturated fatty acids. 
D) esters of glycerol with three predominantly saturated fatty acids. 
E) esters of glycerol with three predominantly unsaturated fatty acids.

Question 3

The difference in chemical structure between cerebrosides and gangliosides is that gangliosides

Accepted Answer

A) have larger fatty acid molecules than cerebrosides. 
B) contain more complex carbohydrates than cerebrosides. 
C) are found in many kinds of cells,but cerebrosides mainly in brain cells. 
D) are based on glycerol and cerebrosides on sphingosine. 
E) are based on sphingosine and cerebrosides on glycerol. 
A) have larger fatty acid molecules than cerebrosides. 
B) contain more complex carbohydrates than cerebrosides. 
C) are found in many kinds of cells,but cerebrosides mainly in brain cells. 
D) are based on glycerol and cerebrosides on sphingosine. 
E) are based on sphingosine and cerebrosides on glycerol.

Question 4

Which C18 fatty acid is a solid at room temperature?

Accepted Answer

A) oleic acid 
B) linoleic acid 
C) linolenic acid 
D) stearic acid 
E) All will be solids at room temperature. 
A) oleic acid 
B) linoleic acid 
C) linolenic acid 
D) stearic acid 
E) All will be solids at room temperature.

Question 5

When a lipid is hydrolyzed to form a mixture of fatty acids,glycerol and phosphate as its products,the lipid is classified as

Accepted Answer

A) simple lipid. 
B) complex lipid. 
C) nonsaponifiable. 
D) miscellaneous. 
A) simple lipid. 
B) complex lipid. 
C) nonsaponifiable. 
D) miscellaneous.

Question 6

Match the following.
-hydrophobic

Accepted Answer

A) describes fatty acids that have mostly single but at least one double carbon-carbon bond 
B) describes the non-polar portion of a molecule that does not interact with water or other polar substances 
C) a process of transport in which integral proteins change shape to allow a substance to cross a cell membrane 
D) describes fatty acids that do not have any carbon-carbon double bonds 
E) a process of transport that costs energy because the flow is against the concentration gradient
F)describes fatty acids that have mostly single but more than one double carbon-carbon bond
G)a process of transport in which substances cross a membrane based on concentration differences without the expenditure of energy
H)describes the polar portion of a molecule that interacts readily with water or other polar substances 
A) describes fatty acids that have mostly single but at least one double carbon-carbon bond 
B) describes the non-polar portion of a molecule that does not interact with water or other polar substances 
C) a process of transport in which integral proteins change shape to allow a substance to cross a cell membrane 
D) describes fatty acids that do not have any carbon-carbon double bonds 
E) a process of transport that costs energy because the flow is against the concentration gradient
F)describes fatty acids that have mostly single but more than one double carbon-carbon bond
G)a process of transport in which substances cross a membrane based on concentration differences without the expenditure of energy
H)describes the polar portion of a molecule that interacts readily with water or other polar substances

Question 7

Which fatty acid composition will yield a triglyceride that will most likely be an oil?

Accepted Answer

A) 3 palmitic acid units 
B) 2 palmitic acid and 1 oleic acid units 
C) 2 linoleic acid and 1 stearic acid units 
D) 3 stearic acid units 
E) 2 palmitic acid and 1 stearic acid units 
A) 3 palmitic acid units 
B) 2 palmitic acid and 1 oleic acid units 
C) 2 linoleic acid and 1 stearic acid units 
D) 3 stearic acid units 
E) 2 palmitic acid and 1 stearic acid units

Question 8

Sphingomyelin is made of

Accepted Answer

A) sphingosine,a fatty acid and phosphoryl choline. 
B) sphingosine,a fatty acid and a trisaccharide. 
C) sphingosine,a fatty acid and glucose. 
D) glycerol and a fatty acid. 
E) glycerol,fatty acid and phosphate. 
A) sphingosine,a fatty acid and phosphoryl choline. 
B) sphingosine,a fatty acid and a trisaccharide. 
C) sphingosine,a fatty acid and glucose. 
D) glycerol and a fatty acid. 
E) glycerol,fatty acid and phosphate.

Question 9

The saponification reaction used to form soaps can be more specifically described as

Accepted Answer

A) acid hydrolysis. 
B) basic hydrolysis. 
C) hydrogenation. 
D) dehydrogenation. 
E) dehydration. 
A) acid hydrolysis. 
B) basic hydrolysis. 
C) hydrogenation. 
D) dehydrogenation. 
E) dehydration.

Question 10

Upon hydrolysis,which of the following lipid types would yield a carbohydrate as a product?

Accepted Answer

A) lecithins 
B) glycolipids 
C) cephalins 
D) phospholipids 
A) lecithins 
B) glycolipids 
C) cephalins 
D) phospholipids

Question 11

Oils are generally ________ at room temperature and are obtained from ________.

Accepted Answer

A) liquids; plants 
B) liquids; animals 
C) solids; plants 
D) solids; animals 
E) none of the above 
A) liquids; plants 
B) liquids; animals 
C) solids; plants 
D) solids; animals 
E) none of the above

Question 12

Which molecule is not a fatty acid?

Accepted Answer

A) CH3(CH2)14COOH 
B) CH3CH2(CH=CHCH2)3(CH2)6COOH 
C) (CH3)2CH(CH2)3COOH 
D) CH3(CH2)7CH=CH(CH2)7COOH 
E) none of the above 
A) CH3(CH2)14COOH 
B) CH3CH2(CH=CHCH2)3(CH2)6COOH 
C) (CH3)2CH(CH2)3COOH 
D) CH3(CH2)7CH=CH(CH2)7COOH 
E) none of the above

Question 13

Which statement about cholesterol is not correct?

Accepted Answer

A) It is an essential component of cell membranes. 
B) It is the precursor for steroid hormones. 
C) It is the precursor for bile acids and salts. 
D) It cannot be synthesized by the body. 
E) It is soluble in non-polar solvents. 
A) It is an essential component of cell membranes. 
B) It is the precursor for steroid hormones. 
C) It is the precursor for bile acids and salts. 
D) It cannot be synthesized by the body. 
E) It is soluble in non-polar solvents.

Question 14

All of the following are components of a cell membrane except

Accepted Answer

A) liposomes. 
B) integral proteins. 
C) peripheral proteins. 
D) glycoproteins. 
E) cholesterol. 
A) liposomes. 
B) integral proteins. 
C) peripheral proteins. 
D) glycoproteins. 
E) cholesterol.

Question 15

A sphingomyelin includes all of the following components except

Accepted Answer

A) amino alcohol. 
B) phosphate group. 
C) sphingosine. 
D) glycerol. 
E) fatty acid. 
A) amino alcohol. 
B) phosphate group. 
C) sphingosine. 
D) glycerol. 
E) fatty acid.

Question 16

In chemical terms,soaps can best be described as

Accepted Answer

A) simple esters of fatty acids. 
B) mixed esters of fatty acids. 
C) salts of carboxylic acids. 
D) long chain acids. 
E) bases formed from glycerol. 
A) simple esters of fatty acids. 
B) mixed esters of fatty acids. 
C) salts of carboxylic acids. 
D) long chain acids. 
E) bases formed from glycerol.

Question 17

Which molecule is a fatty acid?

Accepted Answer

A) CH3COOH 
B) CH2=CHCOOH 
C) (CH3)2CH(CH2)3COOH 
D) CH3(CH2)7CH=CH(CH2)7COOH 
E) none of the above 
A) CH3COOH 
B) CH2=CHCOOH 
C) (CH3)2CH(CH2)3COOH 
D) CH3(CH2)7CH=CH(CH2)7COOH 
E) none of the above

Question 18

Phosphoglycerides differ from glycerides in that one of the hydroxyl groups of the glycerol is esterified with

Accepted Answer

A) phosphoric acid. 
B) phosphorous. 
C) choline. 
D) serine. 
A) phosphoric acid. 
B) phosphorous. 
C) choline. 
D) serine.

Question 19

Soaps are ________.

Accepted Answer

A) alkali metal salts of long chain carboxylic acids 
B) long chain fatty alcohols 
C) esters of a long chain fatty alcohol with a long chain fatty acid 
D) alkali metal salts of glycerol 
E) B and D 
A) alkali metal salts of long chain carboxylic acids 
B) long chain fatty alcohols 
C) esters of a long chain fatty alcohol with a long chain fatty acid 
D) alkali metal salts of glycerol 
E) B and D

Question 20

A phospholipid with the phosphate ester group bonded to choline would be classified as a

Accepted Answer

A) cephalin. 
B) lecithin. 
C) sphingomyelin. 
D) cerebroside. 
E) ganglioside. 
A) cephalin. 
B) lecithin. 
C) sphingomyelin. 
D) cerebroside. 
E) ganglioside.

Exam 23: Lipids

Sketch a lipid bilayer and identify its hydrophobic and hydrophilic portions.

The chemical makeup of oils is

The difference in chemical structure between cerebrosides and gangliosides is that gangliosides

Which C18 fatty acid is a solid at room temperature?

When a lipid is hydrolyzed to form a mixture of fatty acids,glycerol and phosphate as its products,the lipid is classified as

Match the following. -hydrophobic

Which fatty acid composition will yield a triglyceride that will most likely be an oil?

Sphingomyelin is made of

The saponification reaction used to form soaps can be more specifically described as

Upon hydrolysis,which of the following lipid types would yield a carbohydrate as a product?

Oils are generally ________ at room temperature and are obtained from ________.

Which molecule is not a fatty acid?

Which statement about cholesterol is not correct?

All of the following are components of a cell membrane except

A sphingomyelin includes all of the following components except

In chemical terms,soaps can best be described as

Which molecule is a fatty acid?

Phosphoglycerides differ from glycerides in that one of the hydroxyl groups of the glycerol is esterified with

Soaps are ________.

A phospholipid with the phosphate ester group bonded to choline would be classified as a

Matter and Measurements

Atoms and the Periodic Table

Ionic Compounds

Molecular Compounds

Classification and Balancing of Chemical Reactions

Chemical Reactions: Mole and Mass Relationships

Chemical Reactions: Energy, rates, and Equilibrium

Gases, liquids, and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Chemistry: Alkanes

Alkenes, alkynes, and Aromatic Compounds

Some Compounds With Oxygen, sulfur, or a Halogen

Amines

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Amino Acids and Proteins

Enzymes and Vitamins

The Generation of Biochemical Energy

Carbohydrates

Carbohydrate Metabolism

Lipid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Protein and Amino Acid Metabolism

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters

Which C₁₈ fatty acid is a solid at room temperature?

Oils are generally at room temperature and are obtained from .