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47 terms

Ch. 17 Lipids

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Lipids are compounds that are soluble in
chloroform
What phospholipid contains fatty acids but NOT glycerol?
sphingolipid
According to the fluid-mosaic model of a cell membrane, the main component of a membrane is
a lipid bilayer
The type of lipid that gives a cell membrane its shape is a
glycerophospholipid
The steroid hormone present in birth control pills is
norethindrone.
In this diagram of a cell membrane, the objects labeled (E) are
proteins
A double cheeseburger with bacon contains 640 kcal and 39 g of fat. Calculate the number of kilocalories from fat. (1 gram of fat = 9 kcal; 1 gram of carbohydrate or protein delivers 4 kcal.)
350 kcal from fat
Unsaturated fatty acids have lower melting points than saturated fatty acids because
the cis double bonds give them an irregular shape.
Identify the class of lipid to which the following molecule belongs.
wax
A double cheeseburger with bacon contains 640 kcal and 39 g of fat. Calculate the percentage of total kilocalories due to fat (1 gram of fat = 9 kcal).
55% of total kilocalories
Which of the following is a lipid?
cholesterol
Which of the following fatty acids is a solid at room temperature?
stearic
In the fluid-mosaic model that describes plasma membranes,
two layers of glycerophospholipid molecules have their nonpolar sections oriented to the inside of the membrane.
Which of the following compounds is a glycerolphospholipid?
lecithin
In this diagram of a cell membrane, the small branched object labeled (A) is part of a
carbohydrate side chain
A lipoprotein particle functions to
transport nonpolar lipids to body cells..
Synthesis of cholesterol and bile salts takes place in the
liver.
The steroid hormone that increases the blood glucose and glycogen levels from fatty acids and amino acids is
cortisone.
The most common type of gallstones is composed of almost pure
cholesterol.
Which of the following lipids will give a single molecule of fatty acid when hydrolyzed?
wax.
Which statement is NOT true?
Oxidation of lipids provides half as much energy as oxidation of carbohydrates..
Commercially, liquid vegetable oils are converted to solid fats such as margarine by
hydrogenation.
Glycerolphospholipids can interact both with other lipids and water because they contain both __________ and __________.
polar regions; nonpolar regions.
A polyunsaturated fatty acid contains more than one
double bonds.
Margarine containing partially hydrogenated soybean oil is solid because
some of its double bonds have been converted to single bonds..
The main lipid components in cellular membranes are
glycerolphospholipids.
Identify the class of lipid to which the following molecule belongs.
triacylglycerol.
The components in the following glycerolphospholipid are
glycerol, palmitic acid, phosphate, and ethanolamine.
One inner component of a typical cell membrane is
cholesterol.
A triacylglycerol that is solid at room temperature is called a/an
fat.
A fat or oil becomes rancid when
its double bonds are oxidized.
Identify the class of lipid to which the following molecule belongs.
bile salt.
In this diagram of a cell membrane, the object labeled (C) is a
hydrophobic region.
Which of the following is an unsaturated fatty acid?
oleic.
In this diagram of a cell membrane, the object labeled (D) is part of a
cholesterol.
In this diagram of a cell membrane, the object labeled (B) is a
glycerophospholipid bilayer.
A fatty acid salt can act as a soap to remove grease because
the nonpolar tails of the salt dissolve in the grease and the polar salt ends dissolve in water.
Waxes are lipids derived from
a long-chain alcohol and a long-chain fatty acid.
Compared to saturated fatty acids, unsaturated fatty acids have
lower melting points.
Which statement is NOT true?
All lipids contain fatty acids.
Identify the class of lipid to which the following molecule belongs.
glycerophospholipid.
The products of the saponification of a fat are
salts of fatty acids and glycerol.
Which of the following is NOT a function of glycerophospholipids?
aid in digestion.
In the list below, which lipid type is most soluble in water?
glycerophospholipids.
Which of the following lipids will give no fatty acid when hydrolyzed?
cholesterol.
Identify the class of lipid to which the following molecule belongs.
steroid.
The products of the acid catalyzed hydrolysis of a fat are
fatty acids and glycerol.