Concepts in Biochemistry, Chapter 8
Why are fatty acids amphiphilic molecules?
They have both (+) and (-) charges.
They contain saturated and unsaturated groups.
They are water-soluble.
They have polar heads and non-polar tails.
They are unbranched.
Saturated fatty acids have C-C single bonds and unsaturated fatty acids have one or more unsequential C=C double bonds in
configuration. Saturated fatty acids are waxy solids at room temperature while unsaturated fatty acids are oily liquids. This is because:
Unsaturated fatty acids form salts but saturated fatty acids cannot.
Saturated fatty acids pack together to form solids but unsaturated fatty acids cannot because the
C=C double bonds form kinks.
C=C double bonds in unsaturated fatty acids form H bonds with other unsaturated fatty acids.
Unsaturated fatty acids form micelles but saturated fatty acids do not.
Triacylglycerols are a cellular metabolic fuel. Which of the following are true of triacylglycerols?
They are polar, hydrophobic molecules.
Most triacylglycerols have three fatty acid groups that are identical.
They should be completely eliminated from the human diet.
Triacylglycerols from animals are solids at room temperature while those from plants are liquid.
The C=C bond in fatty acids:
Is subject to autooxidation
Reacts with NaOH to form lye
Cannot be converted from
Adipocytes are fat storage cells in animals. These cells contain the enzyme lipase, which catalyzes the release of fatty acids.
This reaction is called:
Designate each group below as a possible constituent of the glycerophospholipids (G) or sphingolipids (S) or both (B) by entering G, S, or B in each blank.
Which of the following is
true of pheromones?
They are used as chemical signals.
They are a means of communication between plants.
They are used in defenses against pathogenic organisms.
They are only found in insects and plants
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