I. MULTIPLE CHOICE: Please choose the BEST ANSWER to the following
questions below.

1. A lipid is an organic compound found in living organisms that is:
a. insoluble in water and insoluble in nonpolar organic solvents.
b. insoluble in water and soluble in nonpolar organic solvents.
c. soluble in water and insoluble in nonpolar organic solvents.
d. soluble in water and soluble in nonpolar organic solvents.

2. A fatty acid is a naturally occurring _____ acid that nearly always contains an _____ number
of carbon atoms with a carbon chain that is _____.
a. dicarboxylic; even; branched
b. dicarboxylic; odd; unbranched
c. monocarboxylic; even; branched
d. monocarboxylic; even; unbranched

3. Which of the following statements is TRUE about the classification of fatty acids?
a. They are classified as saturated or branched unsaturated fatty acids.
b. They are classified as saturated or polyunsaturated fatty acids.
c. They are classified as saturated, monounsaturated, or polyunsaturated fatty acids. d.
None of the above.

4. Which of the following best describe the physical properties of fatty acids?
a. All physical properties of fatty acids are influenced by the length and degree of
unsaturation of their carbon chain.
b. Melting points of fatty acids are influenced by the carbon chain length.
c. Melting points of fatty acids are influenced by their degree of unsaturation.
d. All the above.

5. Triacylglycerols are ________.
a. insoluble in water.
b. partially soluble in water.
c. soluble in water at elevated temperatures.
d. soluble in water.

6. The backbone of a triglyceride is __________.
a. a three-carbon molecule with an aldehyde and two hydroxyl groups.
b. a three-carbon molecule with three hydroxyl groups.
c. esterified fatty acids fused with 1 to 3 carbons.
d. three long-chain fatty acids.

7. Triacylglycerols are _____ in their ability to store energy when compared to glycogen, the
energy storing form of glucose in the human body.
a. equally efficient
b. insignificant
c. less efficient
d. more efficient

8. The essential fatty acids are ________.
a. linoleic and palmitoleic acids.
b. linoleic and β-linoleic acids.
c. omega-3 and omega-6 fatty acids.
d. stearic and oleic acids.

9. The carbon chain of a saturated fatty acid ________.
a. forms hydrogen bonds with itself.
b. has a repeating backbone of sugars and phosphates.
c. has no double bonds.
d. is the basis of the ATP molecule.

10. Fatty acids containing double bonds are found in ________.
a. polysaccharides.
b. proteins.
c. saturated lipids.

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