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Chapter 25
Self-Quiz 1
Self-Quiz 1
This activity contains 10 questions.
Which of the following statements is true?
HDLs transport cholesterol from dead and dying cells back to the liver.
VLDLs transport cholesterol from the liver to peripheral tissues for use or storage.
Chylomicrons transport newly synthesized triglycerides from the liver to the peripheral tissues for metabolism.
LDLs transport dietary lipids from the small intestine to other target tissues for metabolism or storage.
Which of the following statements is true?
Lipase catalyzes the oxidation of fatty acids to acetyl-SCoA.
Low insulin/glucagon ratios promote the degradation of triglycerides by stimulating lipase.
Fatty acid oxidation begins with the oxidation of the carbon adjacent to the carbonyl carbon.
Carnitine is required to transport fatty acids in the bloodstream from storage in the adipose tissues to peripheral tissues where they are oxidized.
Order the following intermediates of beta oxidation sequentially:
a. CH
3
(CH
2
)
4
CH=CH-CO-SCoA
b. CH
3
(CH
2
)
4
-CH(OH)-CH
2
-CO-SCoA
c. CH
3
(CH
2
)
6
-CO-SCoA
d. CH
3
(CH
2
)
4
-CO-SCoA
e. CH
3
(CH
2
)
4
CH
2
-CH(OH)-CO-SCoA
f. CH
3
(CH
2
)
4
-CO-CH
2
-CO-SCoA
c
a
e
f
d
d
a
b
f
c
c
a
f
b
d
c
a
b
f
d
Which of the following statements is
not
true?
Ketosis is the accumulation of ketones in the blood; ketoacidosis is the resultant drop in blood in pH (from acidic ketones).
The heart and muscles use some ketones as fuel even in a well-fed state.
Ketone bodies are a waste product of excess fat catabolism.
If gluconeogenesis is low (e.g., glucose supplies are plentiful), even high rates of fat catabolism will fail to produce ketones.
What is the difference between ketosis and ketoacidosis?
Ketosis is a deficiency in the production of the ketone, acetyl-SCoA. Ketoacidosis is the concomitant increase in the synthesis of citric acid.
Ketosis is characterized by high blood ketone levels; ketoacidosis is a concomitant decrease in blood pH.
Ketosis is characterized by high blood levels of ketone bodies; the acid-catalyzed oxidation of these ketone bodies into citric acid cycle intermediates is ketoacidosis.
Ketosis is characterized by high blood levels of acetone; ketoacidosis is the concomitant increase in the blood level of citric acid.
Between meals, ______ levels rise and stimulate ______ to degrade triglycerides.
insulin, acetyl-SCoA carboxylase
glycogen; lipase
insulin; lipase
glucagon; lipase
Which of the following statements is
not
true?
Glycerophospholipids have more polar head groups than triglycerides.
Triglycerides contain three fatty acids; glycerophospholipids contain two fatty acids.
Neither glycerophospholipids nor triglycerides have a glycerol backbone.
Glycerophospholipids contain sphingosine; triglycerides contain three glycerol molecules.
Which of the following is an essential fatty acid?
linoleic acid
palmitic acid
stearic acid
oleic acid
How many molecules of ATP are formed during the complete oxidation of one molecule of lauric acid?
70 ATP
78 ATP
68 ATP
80 ATP
The presence of excess ketone bodies in the blood and urine is a condition known as
hypoglycemia.
ketosis.
acidosis.
alkalosis.
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