Question 1

Eicosanoids function as

Accepted Answer

A) sex hormones. 
B) thyroid hormones. 
C) local hormones. 
D) neurotransmitters. 
E) membrane components. 
A) sex hormones. 
B) thyroid hormones. 
C) local hormones. 
D) neurotransmitters. 
E) membrane components.

Question 2

Which statement about eicosanoids is not correct?

Accepted Answer

A) The parent molecule,arachidonic acid,contains 20 carbon atoms. 
B) Linolenic acid is a precursor to arachidonic acid. 
C) All of the molecules in this category are unsaturated. 
D) Eicosanoids function as "local hormones," acting as short-term chemical messengers. 
E) none of the above 
A) The parent molecule,arachidonic acid,contains 20 carbon atoms. 
B) Linolenic acid is a precursor to arachidonic acid. 
C) All of the molecules in this category are unsaturated. 
D) Eicosanoids function as "local hormones," acting as short-term chemical messengers. 
E) none of the above

Question 3

Saturated triacylglycerols are usually ________ because ________.

Accepted Answer

A) liquids; they have relatively short fatty acid chains 
B) liquids; their rigid fatty acid chains do not fit together closely 
C) liquids; they contain impurities from their natural sources 
D) solids; they have relatively long fatty acid chains 
E) solids; their flexible fatty acid chains allow the molecules to fit together closely 
A) liquids; they have relatively short fatty acid chains 
B) liquids; their rigid fatty acid chains do not fit together closely 
C) liquids; they contain impurities from their natural sources 
D) solids; they have relatively long fatty acid chains 
E) solids; their flexible fatty acid chains allow the molecules to fit together closely

Question 4

Fats 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 5

Match the following.
-facilitated diffusion

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 6

The function of cholesterol in a cell membrane is to

Accepted Answer

A) act as a precursor to steroid hormones. 
B) take part in the reactions that produce bile acids. 
C) maintain structure because of its flat rigid characteristics. 
D) attract hydrophobic molecules to form solid deposits. 
E) none of the above 
A) act as a precursor to steroid hormones. 
B) take part in the reactions that produce bile acids. 
C) maintain structure because of its flat rigid characteristics. 
D) attract hydrophobic molecules to form solid deposits. 
E) none of the above

Question 7

The compound that is the immediate precursor to the prostaglandins is

Accepted Answer

A) cholesterol. 
B) oleic acid. 
C) stearic acid. 
D) arachidonic acid. 
E) leukotriene. 
A) cholesterol. 
B) oleic acid. 
C) stearic acid. 
D) arachidonic acid. 
E) leukotriene.

Question 8

A protein which extends completely through the cell membrane is referred to as a(an)

Accepted Answer

A) liposome. 
B) integral protein. 
C) peripheral protein. 
D) glycoprotein. 
E) cholesterol. 
A) liposome. 
B) integral protein. 
C) peripheral protein. 
D) glycoprotein. 
E) cholesterol.

Question 9

Use the terms hydrophobic,hydrophilic,and micelle to explain how a soap removes grease from fabric.

Accepted Answer

Soap molecules are salts of fatty acids,

Question 10

Which of the following is not a biochemical function of waxes?

Accepted Answer

A) prevention of water loss by leaves 
B) waterproofing of feathers in shore birds 
C) energy storage for animals 
D) structural materials in beehives 
E) physical protection of mammalian ears 
A) prevention of water loss by leaves 
B) waterproofing of feathers in shore birds 
C) energy storage for animals 
D) structural materials in beehives 
E) physical protection of mammalian ears

Question 11

A certain glycerophospholipid is made of glycerol,two fatty acids,a phosphate and ethanolamine.Which components do carboxylic ester linkages connect?

Accepted Answer

A) the fatty acids and phosphate 
B) glycerol and ethanolamine 
C) glycerol and the fatty acids 
D) phosphate and ethanolamine 
E) There are no carboxylic ester linkages. 
A) the fatty acids and phosphate 
B) glycerol and ethanolamine 
C) glycerol and the fatty acids 
D) phosphate and ethanolamine 
E) There are no carboxylic ester linkages.

Question 12

The type of lipid that is predominant in cell membranes is

Accepted Answer

A) fats. 
B) phospholipids. 
C) waxes. 
D) steroids. 
E) leukotrienes. 
A) fats. 
B) phospholipids. 
C) waxes. 
D) steroids. 
E) leukotrienes.

Question 13

Steroids are

Accepted Answer

A) simple esters of long chain alcohols and fatty acids. 
B) esters of glycerol with three predominantly saturated fatty acids. 
C) esters of glycerol with three predominantly unsaturated fatty acids. 
D) based on a tetracyclic ring system with substituents at various positions. 
E) based on a system composed of four adjacent aromatic rings with substituents at various positions. 
A) simple esters of long chain alcohols and fatty acids. 
B) esters of glycerol with three predominantly saturated fatty acids. 
C) esters of glycerol with three predominantly unsaturated fatty acids. 
D) based on a tetracyclic ring system with substituents at various positions. 
E) based on a system composed of four adjacent aromatic rings with substituents at various positions.

Question 14

Biomolecules classified as lipids are

Accepted Answer

A) polyhydroxy aldehydes or ketones,or compounds which produce those when hydrolyzed. 
B) polymers of α-amino acids. 
C) soluble in non-polar solvents. 
D) six-membered rings with delocalized electrons. 
E) polymers of diacids and diamines. 
A) polyhydroxy aldehydes or ketones,or compounds which produce those when hydrolyzed. 
B) polymers of α-amino acids. 
C) soluble in non-polar solvents. 
D) six-membered rings with delocalized electrons. 
E) polymers of diacids and diamines.

Question 15

Which choice is an example of a material that is transported across cell membranes by active transport?

Accepted Answer

A) cholesterol 
B) K+ 
C) glucose 
D) oxygen 
E) carbon dioxide 
A) cholesterol 
B) K+ 
C) glucose 
D) oxygen 
E) carbon dioxide

Question 16

Which molecule is a saturated fatty acid?

Accepted Answer

A) CH3(CH2)14COOH 
B) CH3(CH2)7CH=CH(CH2)7COOH 
C) CH3CH=CHCH2COOH 
D) (CH3)2CH(CH2)3COOH 
E) none of the above 
A) CH3(CH2)14COOH 
B) CH3(CH2)7CH=CH(CH2)7COOH 
C) CH3CH=CHCH2COOH 
D) (CH3)2CH(CH2)3COOH 
E) none of the above

Question 17

Match the following.
-active transport

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 18

Which reaction can be used to convert oils into fats?

Accepted Answer

A) hydrogenation 
B) hydrolysis 
C) esterification 
D) saponification 
E) dehydration 
A) hydrogenation 
B) hydrolysis 
C) esterification 
D) saponification 
E) dehydration

Question 19

Local hormones ________.

Accepted Answer

A) are short-lived 
B) can be prostaglandins 
C) can be leukotrienes 
D) act near their point of synthesis 
E) all of the above 
A) are short-lived 
B) can be prostaglandins 
C) can be leukotrienes 
D) act near their point of synthesis 
E) all of the above

Question 20

Which molecule is a polyunsaturated fatty acid?

Accepted Answer

A) CH3(CH2)7CH=CH(CH2)7COOH 
B) CH2=CHCH=CHCOOH 
C) CH3CH2(CH=CHCH2)3(CH2)6COOH 
D) HOOCCH2(CH=CHCH2)3CH2COOH 
E) none of the above 
A) CH3(CH2)7CH=CH(CH2)7COOH 
B) CH2=CHCH=CHCOOH 
C) CH3CH2(CH=CHCH2)3(CH2)6COOH 
D) HOOCCH2(CH=CHCH2)3CH2COOH 
E) none of the above

Exam 23: Lipids

Eicosanoids function as

Which statement about eicosanoids is not correct?

Saturated triacylglycerols are usually ________ because ________.

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

Match the following. -facilitated diffusion

The function of cholesterol in a cell membrane is to

The compound that is the immediate precursor to the prostaglandins is

A protein which extends completely through the cell membrane is referred to as a(an)

Use the terms hydrophobic,hydrophilic,and micelle to explain how a soap removes grease from fabric.

Which of the following is not a biochemical function of waxes?

A certain glycerophospholipid is made of glycerol,two fatty acids,a phosphate and ethanolamine.Which components do carboxylic ester linkages connect?

The type of lipid that is predominant in cell membranes is

Steroids are

Biomolecules classified as lipids are

Which choice is an example of a material that is transported across cell membranes by active transport?

Which molecule is a saturated fatty acid?

Match the following. -active transport

Which reaction can be used to convert oils into fats?

Local hormones ________.

Which molecule is a polyunsaturated fatty acid?

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

Saturated triacylglycerols are usually because .

Fats are generally at room temperature and are obtained from .