Quiz 3
Name ____________________
1. Which lipid has the highest energy content (for human metabolism)? All have 20 carbon atoms in
each of their fatty acid chains.
A) a fat containing only monounsaturated fatty acids
B) a fat containing only polyunsaturated fatty acids
*C) a fat containing only saturated fatty acids
2. Cholesterol is the building block (= precursor) for which of the following substances?
A) hormones
B) phospholipids
C) Vitamin D
D) all of the above
*E) A and C only
3. What is the structure of a “fat” (also know as a triglyceride)?
A) a protein with tertiary structure
*B) a lipid made with three fatty acids and glycerol
C) a lipid that makes up much of the plasma membrane
D) a molecule formed from three alcohols by dehydration reactions
E) a carbohydrate with three sugars joined together by glycosidic linkages
4. Which of the following is true regarding saturated fatty acids?
A) They are the predominant fatty acid in corn oil.
B) They have double bonds between carbon atoms of the fatty acids.
*C) They are the principal molecules in lard and butter.
D) They are usually liquid at room temperature.
E) They are usually produced by plants.
5. Why are human sex hormones considered to be lipids?
A) They are essential components of cell membranes.
*B) They are steroids, which are not soluble in water.
C) They are made of phosphates.
D) They are hydrophilic compounds.
E) They contribute to heart disease.
6. Which of the following statements concerning unsaturated fats is true?
A) They are more common in animals than in plants.
*B) They have double bonds in the carbon chains of their fatty acids.
C) They are found in butter.
D) They contain more hydrogen than saturated fats having the same number of carbon atoms.
E) They have fewer fatty acid molecules per fat molecule.
7. Which of these are macromolecules?
A) Lipids
B) Carbohydrates
C) Proteins
D) Nucleic Acids
*E) All of the Above
F) None of the Above
8. Which of these is not a polymer (long chains of molecules hooked together end to end – like train
cars)?
*A) Lipids
B) Carbohydrates
C) Proteins
D) Nucleic Acids
E) All of the Above
F) None of the Above
9. In this class, what is meant by the statement “water is a polar molecule”?
A) You can find water at both of Earth's poles
*B) Water molecules have areas of positive and negative charge due to differences in O and H
electronegativity
C) Pure water (H20) is an excellent conductor of electric current
10. Which element has a greater electronegativity (desire for electrons)?
A) Hydrogen
*B) Oxygen