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LIPIDS
1
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Arachidonic Acid:
a) Is a branched fatty acid
b) Contains 3 double bonds
c) Is a precursor for eicosanoids
d) Contains 5 double bonds
e) Is a 20-carbon saturated fatty acid
3
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Lipids are important in the human body because they act as:
a) Enzymes
b) Immune molecules
c) Lubricants
d) Stored genetic information
e) Energy source
5
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Fatty acids:
a) Are always dicarboxylic
b) Are only composed of an even number of C atoms
c) Are obtained from the hydrolysis of triacylglycerol
d) Contains glycerol
e) Are the only components of cell membrane lipids
7
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Arachidonic acid is:
a) The same as arachidic acid
b) Essential fatty acid
c) The precursor of prostaglandins
d) Not found in membrane lipids
e) Is a 22-carbon compound
9
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Lipids are important in the human body because they act as:
a) Enzymes and hormones
b) Hormones and energy source
c) Coenzyme and enzymes
d) Stored genetic information
e) Energy source and lubricants
11
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Structural lipids include:
a) Gangliosides and aminoglycosides
b) Cerebrosides and cholesterol
c) Phenylaline and phosphatidylserine
d) Phosphatidylserine and glucosamine
e) Glycosaminoglycans and proteoglycans
13
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In mammals, cholesterol is:
a) A normal membrane constituent
b) Converted to cholic acid by intestinal bacteria
c) Important source of energy
d) Parent molecule for sphingolipids
e) Synthesized in the liver mitochondria
15
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Unlike prostaglandins, thromboxanes:
a) Are derived from arachidonic acid
b) Are synthesized cyclooxygenase pathway
c) Are released by platelets
d) Act as local hormones
e) Have 20 carbons
17
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Triacylglycerol and Glycogen:
a) Are storage form of energy in plants
b) Are polymers of glucose
c) Are storage form of energy in animals
d) Have the same energy yield on complete oxidation
e) Are mainly stored in the liver
19
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Unsaturated fatty acids:
a) Are obtained in the diet from animals
b) Are always in the cis configuration
c) Include linolenic acid and arachidonic acid
d) Give important derivatives
e) Are water soluble
21
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Cholesterol is:
a) Found in plants
b) Membrane lipid
c) Non-amphipathic lipid
d) Precursor of bilirubin
e) A source of energy
23
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The following is an important function of cholesterol:
a) Synthesis of acetylcholine
b) Synthesis of prostaglandins
c) Formation of bile salts
d) Formation of phosphatidylcholine
e) Increasing membrane rigidity
25
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The following is true about eicosanoids:
a) Prostacyclines inhibit platelet aggregation
b) Thromboxanes cause platelet aggregation
c) Prostaglandins enhance smooth muscle contraction
d) Leukotrienes are allergic mediators
e) All of the above is correct
27
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The following statement about simple lipids is true:
a) TAG's always contain similar fatty acids
b) Waxes are esters of fatty acids with high molecular weight polyhydric
alcohols
c) Glucosyl ceramide is the main simple lipid in extra-neural tissues
d) Some contain fatty acids with odd carbon number
e) Include only esters of fatty acids with glycerol
29
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The following is a storage lipid:
a) Triacylglycerol
b) Cholesteryl esters
c) Cholesterol
d) Phospholipid
e) Galactosyl ceramide
31