Brooks School

AP Chapter 5 Quiz

1. Which type of lipid is most important in biological membranes?
a. fats
b. steroids
c. phospholipids
d. oils
e. triglycerides
2. Which type of interaction stabilizes the alpha helix structure of proteins?
a. hydrophobic interactions
b. non-polar covalent bonds
c. ionic Interactions
d. hydrogen bonds
e. polar covalent bonds
3. Which of the following statements best summarizes structural differences between DNA and RNA?
a. RNA is a protein while DNA is a nucleic acid.
b. DNA is not a polymer, but RNA is.
c. DNA contains a different sugar than RNA.
d. Both DNA and RNA are found as double helices in nature.
e. DNA has different purine bases than RNA.

4. What is the molecule illustrated below?

a. a saturated fatty acid
b. an unsaturated fatty acid
c. a polyunsaturated triglyceride
d. likely to be a common component of plant oils
e. similar in structure to a steroid

5. Which of the following is true of an amino acid and starch?
a. Both contain nitrogen.
b. Both contain oxygen.
c. Both are polymers.
d. Both are hydrophobic.
e. Both are found in proteins.

6. Large organic molecules are usually assembled by polymerization of a few kinds of simple subunits. Which of the following is an exception to the above statement?
a. a steroid
b. cellulose
c. DNA
d. an enzyme
e. a contractile protein

7. Altering which of the following levels of structural organization of a protein could alter the function of an enzyme?
a. primary
b. secondary
c. tertiary
d. Only primary and tertiary are correct.
e. primary, secondary, and tertiary

8. The structural feature that allows the DNA to replicate itself is the
a. sugar-phosphate backbone
b. complementary pairing of the bases
c. phosphodiester bonding of the helices
d. twisting of the molecule to form an alpha helix
e. three part structure of the nucleotides

9. Which of the following would yield the most energy per gram when oxidized?
a. starch
b. glycogen
c. fat
d. protein
e. monosaccharides

10. All of the following molecules are carbohydrates EXCEPT
a. lactose.
b. cellulose.
c. hemoglobin.
d. glycogen.
e. starch.

11. What would be an expected consequence of changing one amino acid in a particular protein?
a. The primary structure would be changed.
b. The tertiary structure might be changed.
c. The biological activity of this protein might be altered.
d. The number of amino acids present would stay the same.
e. All of these are expected.

Refer to Figure 5.6 (based on the molecules illustrated) to answer questions 12-15.

Figure 5.6

12. An amino acid.
a. 1
b. 2
c. 3
d. 4
e. 5

13. Makes up cellulose microfibrils.
a. 1
b. 2
c. 3
d. 4
e. 5

14. A component of DNA.
a. 1
b. 2
c. 3
d. 4
e. 5

15. A structural component of cell membranes.
a. 1
b. 2
c. 3
d. 4
e. 5