Question 1

Which statements are true for the process of β-oxidation?
I.It occurs in the mitochondria.
II.Acyl carrier proteins are involved.
III.NADPH is the coenzyme.
IV.The molecule increases in length by two carbons.
V.Energy is released in the process.

Accepted Answer

A)  I,III,V
B)  II,IV
C)  I,V
D)  I,II,III,IV,V
E)  II,III,IV

Question 2

Glycerol produced as a byproduct of metabolism of lipids is converted to ________,which can be isomerized to a compound that can enter glycolysis or gluconeogenesis.

Accepted Answer

A)  fatty acids
B)  citrate
C)  dihydroxyacetone phosphate
D)  acetone
E)  carbon dioxide

Question 3

The first chemical step in the breakdown of triacylglycerols is

Accepted Answer

A)  complete hydrolysis to fatty acids and glycerols.
B)  partial hydrolysis to fatty acids,phosphates,and diacylglycerols.
C)  oxidation of alcohol groups to carbonyls.
D)  rearrangement to cholesterol derivatives.
E)  none of the above

Question 4

Fatty acids are activated for breakdown by conversion to ________.

Accepted Answer

A)  fatty acid SCoA's
B)  triacylglycerides
C)  fatty acid glycerol phosphates
D)  fatty acid alkyl esters
E)  none of the above

Question 5

Which of the following lipoproteins is used solely for the transport of lipids in the blood?

Accepted Answer

A)  chylomicrons
B)  ultra-high-density lipoproteins
C)  high-density lipoproteins
D)  low-density lipoproteins
E)  very low-density lipoproteins

Question 6

Chylomicrons are the least dense of all the lipoprotein/lipid combinations because

Accepted Answer

A)  their lipoproteins nest together easily.
B)  they have a high ratio of cholesterol to triacylglycerols.
C)  they have the highest proportion of less dense lipid molecules.
D)  there are many carbohydrate groups included in the external structure.
E)  their amino acids are mostly hydrophobic.

Question 7

The synthesis of fatty acids

Accepted Answer

A)  takes place by simply the reverse reactions of the fatty acid spiral.
B)  takes place in the same location within a cell as the fatty acid spiral.
C)  takes place by different reactions than the reverse of the fatty acid spiral and in a different cellular location.
D)  More than one response is correct.
E)  No response is correct.

Question 8

What is the role of a chylomicron?

Accepted Answer

A)  to transport triacylglycerols in the bloodstream
B)  to synthesize cholesterol and other steroids
C)  to move triacylglycerol across the cell membrane
D)  to store excess triacylglycerols until they are needed
E)  to transport acetyl-CoA from the cytosol to the mitochondria

Question 9

Digestion of lipids begins in the ________,in a process catalyzed by ________.

Accepted Answer

A)  mouth; salivary amylase
B)  stomach; hydrochloric acid
C)  small intestine; pancreatic lipases
D)  large intestines; bile acids
E)  adipocytes; triacylglycerol lipase

Question 10

Fatty acids from triacylglycerols can be ________ when energy is plentiful or ________ when energy is needed.

Accepted Answer

A)  oxidized to produce acetyl-SCoA; stored as triacylglycerols in adipose tissue
B)  stored as triacylglycerols in adipose tissue; oxidized to produce acetyl-SCoA
C)  stored as cholesterol derivatives in adipose tissue; oxidized to produce glucose
D)  reduced to hydrocarbons; isomerized to lower energy forms
E)  diverted to gluconeogenesis; hydrolyzed to smaller molecules

Question 11

In comparing the potential energy of lipids and carbohydrates on a weight basis,it is correct to say that lipids provide

Accepted Answer

A)  considerably less energy than carbohydrates.
B)  slightly less energy than carbohydrates.
C)  almost the same amount of energy as carbohydrates.
D)  slightly more energy than carbohydrates.
E)  considerably more energy than carbohydrates.

Question 12

Which lipoprotein transports cholesterol from the liver to sites where it is used in cell membranes or in steroid synthesis?

Accepted Answer

A)  chylomicrons
B)  ultra-high-density lipoproteins
C)  high-density lipoproteins
D)  low-density lipoproteins
E)  very low-density lipoproteins

Question 13

Where in the cell does beta-oxidation of fatty acids occur?

Accepted Answer

A)  cell wall
B)  cytosol
C)  nucleus
D)  mitochondria
E)  liposome

Question 14

High density lipoproteins contain a greater amount of ________ than do low density lipoproteins.

Accepted Answer

A)  protein
B)  lipids
C)  triglycerides
D)  cholesterol
E)  fatty acids

Question 15

Which lipoprotein transports cholesterol to the liver to be recycled or excreted?

Accepted Answer

A)  chylomicrons
B)  ultra-high-density lipoproteins
C)  high-density lipoproteins
D)  low-density lipoproteins
E)  very low-density lipoproteins

Question 16

Ketone bodies are primarily produced in ________ cells.

Accepted Answer

A)  brain
B)  heart
C)  liver
D)  kidney
E)  red blood

Question 17

Match the following.
-ketonuria

Accepted Answer

A)  results from increased concentrations of ketone bodies in the blood
B)  the catabolic reaction in which fatty acids are broken down two carbons at a time
C)  the anabolic process of synthesizing fatty acids
D)  presence of ketone bodies in the urine

Question 18

Ketogenesis occurs from a(an)

Accepted Answer

A)  underproduction of ketone bodies.
B)  consumption of too much sugar.
C)  overproduction of acetyl CoA.
D)  underproduction of acetyl CoA.
E)  overproduction of ketone bodies.

Exam 24: Lipid Metabolism

Glycerol produced as a byproduct of metabolism of lipids is converted to ________,which can be isomerized to a compound that can enter glycolysis or gluconeogenesis.

Correct Answer
verified

Fatty acids are activated for breakdown by conversion to ________.

Correct Answer
verified

What is the role of a chylomicron?

Correct Answer
verified

In comparing the potential energy of lipids and carbohydrates on a weight basis,it is correct to say that lipids provide

Correct Answer
verified

Where in the cell does beta-oxidation of fatty acids occur?

Correct Answer
verified

Which lipoprotein transports cholesterol from the liver to sites where it is used in cell membranes or in steroid synthesis?

Correct Answer
verified

Which lipoprotein transports cholesterol to the liver to be recycled or excreted?

Correct Answer
verified

Which statements are true for the process of β-oxidation? I.It occurs in the mitochondria. II.Acyl carrier proteins are involved. III.NADPH is the coenzyme. IV.The molecule increases in length by two carbons. V.Energy is released in the process.

Correct Answer
verified

High density lipoproteins contain a greater amount of ________ than do low density lipoproteins.

Correct Answer
verified

Ketone bodies are primarily produced in ________ cells.

Correct Answer
verified

The first chemical step in the breakdown of triacylglycerols is

Correct Answer
verified

Which of the following lipoproteins is used solely for the transport of lipids in the blood?

Correct Answer
verified

Chylomicrons are the least dense of all the lipoprotein/lipid combinations because

Correct Answer
verified

Ketogenesis occurs from a(an)

Correct Answer
verified

Match the following. -ketonuria

Correct Answer
verified

Fatty acids from triacylglycerols can be when energy is plentiful or when energy is needed.

Correct Answer
verified

The synthesis of fatty acids

Correct Answer
verified

Digestion of lipids begins in the ,in a process catalyzed by .

Correct Answer
verified

Exam 24: Lipid Metabolism

Glycerol produced as a byproduct of metabolism of lipids is converted to ________,which can be isomerized to a compound that can enter glycolysis or gluconeogenesis.

Correct AnswerverifiedShow Answer

Fatty acids are activated for breakdown by conversion to ________.

Correct AnswerverifiedShow Answer

What is the role of a chylomicron?

Correct AnswerverifiedShow Answer

In comparing the potential energy of lipids and carbohydrates on a weight basis,it is correct to say that lipids provide

Correct AnswerverifiedShow Answer

Where in the cell does beta-oxidation of fatty acids occur?

Correct AnswerverifiedShow Answer

Which lipoprotein transports cholesterol from the liver to sites where it is used in cell membranes or in steroid synthesis?

Correct AnswerverifiedShow Answer

Which lipoprotein transports cholesterol to the liver to be recycled or excreted?

Correct AnswerverifiedShow Answer

Which statements are true for the process of β-oxidation? I.It occurs in the mitochondria. II.Acyl carrier proteins are involved. III.NADPH is the coenzyme. IV.The molecule increases in length by two carbons. V.Energy is released in the process.

Correct AnswerverifiedShow Answer

High density lipoproteins contain a greater amount of ________ than do low density lipoproteins.

Correct AnswerverifiedShow Answer

Ketone bodies are primarily produced in ________ cells.

Correct AnswerverifiedShow Answer

The first chemical step in the breakdown of triacylglycerols is

Correct AnswerverifiedShow Answer

Which of the following lipoproteins is used solely for the transport of lipids in the blood?

Correct AnswerverifiedShow Answer

Chylomicrons are the least dense of all the lipoprotein/lipid combinations because

Correct AnswerverifiedShow Answer

Ketogenesis occurs from a(an)

Correct AnswerverifiedShow Answer

Match the following. -ketonuria

Correct AnswerverifiedShow Answer

Fatty acids from triacylglycerols can be ________ when energy is plentiful or ________ when energy is needed.

Correct AnswerverifiedShow Answer

The synthesis of fatty acids

Correct AnswerverifiedShow Answer

Digestion of lipids begins in the ________,in a process catalyzed by ________.

Correct AnswerverifiedShow Answer

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Fatty acids from triacylglycerols can be when energy is plentiful or when energy is needed.

Correct Answer
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Digestion of lipids begins in the ,in a process catalyzed by .

Correct Answer
verified