Quick Quiz (7/10/13)
1) What is the difference between covalent bonds and ionic bonds?
A) Covalent bonds are formed between atoms to form molecules; ionic bonds are formed between atoms to form compounds.
B) Covalent bonds involve the sharing of pairs of electrons between atoms; ionic bonds involve the sharing of single electrons between atoms.
C) Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between atoms.
D) Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the sharing of protons between atoms.
E) Covalent bonds involve the transfer of electrons between atoms; ionic bonds involve the sharing of electrons between atoms.
2) Which bond or interaction between atoms would be difficult to disrupt when the interacting atoms are put into water and heated slightly?
A) covalent bond
B) hydrogen bond
C) van der Waals interaction
D) ionic bond
E) either covalent bonds or ionic bonds
The following excerpt from a periodic table is used for questions 3 and 4. The atomic number refers to the number of protons for each element.
3) In the figure above, how many electrons does nitrogen have in its valence shell?
A) 2
B) 5
C) 7
D) 8
E) 1
4) In the figure above, how many UNPAIRED electrons does phosphorus have in its valence shell?
A) 15
B) 2
C) 3
D) 7
E) 5
5) Consider two solutions: solution X has a pH of 4; solution Y has a pH of 7. From this information, we can reasonably conclude that
A) solution Y has no free hydrogen ions (H+).
B) the concentration of hydrogen ions in solution X is 30 times as great as the concentration of hydrogen ions in solution Y.
C) the concentration of hydrogen ions in solution Y is 1,000 times as great as the concentration of hydrogen ions in solution X.
D) the concentration of hydrogen ions in solution X is 3 times as great as the concentration of hydrogen ions in solution Y.
E) the concentration of hydrogen ions in solution X is 1,000 times as great as the concentration of hydrogen ions in solution Y.

6) The figure below shows the structures of glucose and fructose. These two molecules differ in the
A) number of carbon, hydrogen, and oxygen atoms.
B) types of carbon, hydrogen, and oxygen atoms.
C) arrangement of carbon, hydrogen, and oxygen atoms.
D) number of oxygen atoms joined to carbon atoms by double covalent bonds.
E) number of carbon, hydrogen, and oxygen atoms; the types of carbon, hydrogen, and oxygen atoms; and the arrangement of carbon, hydrogen, and oxygen atoms.
The following figure is used for questions 7-9.
7) Which of the structures illustrated above is an impossible covalently bonded molecule?
A) A
B) B
C) C
D) D
E) E
8) In which of the structures illustrated above are the atoms bonded by ionic bonds?
A) A
B) B
C) C
D) C, D, and E only
E) none of the structures
9) Which of the structures illustrated above cannot form hydrogen bonds with water molecules?
A) A
B) B
C) C
D) D
E) E
10. Relatively small organic molecules with a central carbon atom which is bonded to a carboxyl group, an amino group, a carbon containing group, and a hydrogen atom are called
A. amino acids.
B. fatty acids.
C. enzymes.
D. peptides.
E. nucleotides.

11. All of the following are examples of functional groups in cells except
A. -CH
3
.
B. -COOH.
C. H
2
O.
D. -NH
2
.
E. -OH.
12. Carbohydrates are polymers formed of structural units called
A. amino acids.
B. fatty acids.
C. nucleic acids.
D. phosphate groups.
E. monosaccharides.
13. Proteins are polymers formed of structural units called
A. fatty acids.
B. amino acids.
C. nucleic acids.
D. phosphate groups.
E. sugars.
14. Lipids are the only class of macromolecules that contain
A. amino acids.
B. nucleic acids.
C. fatty acids.
D. phosphate groups.
E. sugars.
15. Which of the following macromolecules are characteristically water-insoluble?
A. proteins
B. nucleic acids
C. carbohydrates
D. lipids
E. enzymes
16. The specific amino acid sequence in a protein is its
A. zero order structure.
B. primary structure.
C. secondary structure.
D. tertiary structure.
E. quaternary structure.
17. Alpha helix and beta pleated sheets are examples of which level of protein structure?
A. zero order
B. primary
C. secondary
D. tertiary
E. quaternary