1. Which of the following statements regarding solutions is false?
a. Hydrophobic molecules will not dissolve well in a polar solution.
b. The solvent is the liquid in which a substance is mixed.
c. Hydrophilic molecules form micelles when dissolved in water.
d. When salt dissolves in water, its ionic bonds break.
2. Which of the following differences is true?
a. Saturated fatty acis are solid at room temperature, while unsaturated fatty
acids are liquid.
b. Saturated fatty acids have multiple double bonds, while unsaturated fatty acids
have none.
c. Saturated fats are natural fatty acids, while all unsaturated fatty acids are
synthetic.
d. Both a and b are true.
3. Which of the following statements regarding phospholipids is true?
a. Phospholipids are composed of a phosphate group bonded to a glycerol
molecule, which is in turn bonded to three fatty acids.
b. A phospholipid has a polar head region and a nonpolar tail region.
c. When placed in water, phospholipids orient themselves such that the tails
maximally interact with water and the heads do not interact with water.
d. Both a and b are true.
4. What is the name of the structure that phospholipids form when placed in water?
a. Ring
b. Liposome
c. Micelle
d. Ball
5. From slowest to fastest, which of the following correctly reflects the speed at which
the following molecules can cross a phospholipid bilayer?
a. Sodium ion, Sucrose, Water, Carbon Dioxide
b. Sodium ion, Sucrose, Carbon Dioxide, Water
c. Water, Carbon Dioxide, Sucrose, Sodium ion
d. Sucrose, Water, Sodium ion, Carbon Dioxide
6. Which of these methods would work best to increase membrane permeability?
a. Adding cholesterol to the membrane
b. Using more unsaturated hydrocarbon chains
c. Using hydrocarbon chains with longer tails
d. Both a and b are true.
7. Regarding solute movement, which of the following statements is false?
a. Passive transport does not require any energy.
b. At equilibrium, molecules no longer cross the lipid bilayer.
c. Energy is required for active transport.
d. Facilitated diffusion is a form of passive transport.
8. What is the BEST name for the movement of water across a lipid bilayer?
a. Osmosis
b. Diffusion
c. Facilitated Diffusion
d. Lysis
9. Inside a cell, the concentration of sodium ions is 2M. Outside the cell, the
concentration of sodium is 1M. Which of the following is correct?
a. The inside solution is hypertonic to the outside; water will flow out of the cell.
b. The inside solution is hypotonic to the outside; water will flow into the cell.
c. The inside solution is hypertonic to the outside; water will flow into the cell.
d. The inside solution is isotonic to the outside; water will flow out of the cell.
10. Which of the following terms refers to the swelling and eventual bursting of a cell?
a. Crenation
b. Osmolysis
c. Plasmolysis
d. Glycolysis
11. Which of the following comparisons between prokaryotic and eukaryotic cells is
false?
a. Eukaryotes have a well defined nucleus; Prokaryotes do not.
b. Eukaryotes have many membrane-bound organelles; Prokaryotes do not.
c. Generally, individual prokaryotic cells are larger than eukaryotic cells.
d. Both prokaryotes and eukaryotes have ribosomes in their cells.
12. Which of the following structures is not correctly matched with its function?
a. Ribosome – protein synthesis
b. Peroxisome – protein packaging
c. Cell wall – external support
d. Cytoskeleton – internal support
13. Which of the following organelles is not found in animal cells, but is found in plant
cells?
a. Vacuole
b. Lysosome
c. Golgi Apparatus
d. Endosome
14. Regarding organelles, which of the following statements is false?
a. A major difference between smooth ER and rough ER is the presence of
ribosomes on rough ER.
b. A main function of smooth ER is lipid synthesis.
c. The golgi apparatus consists of a series of cisternae.
d. Unlike chloroplasts, mitochondria contain their one DNA.
15. Which of the following statements regarding energy is true?
a. Potential energy represents the energy of motion.
b. Kinetic energy represents the stored energy, such as chemical bonds.
c. The first law of energy states that energy cannot be created or destroyed.
d. The second law of energy states that the transformation of energy must
decrease entropy.
16. What word refers to a reaction that releases energy?
a. Exergonic
b. Endergonic
c. Intergonic
d. Intragonic
17. The ΔG for a certain reaction is +5.1 kcal / mol. Which of the following statements is
false?
a. This reaction is endergonic.
b. This reaction will not happen spontaneously.
c. If coupled with ATP hydrolysis, this reaction will happen spontaneously.
d. A large amount of energy is released at the end of the reaction.
18. Enzymes are usually which biological molecule?
a. Lipid
b. Protein
c. Carbohydrate
d. Nucleic Acid
19. An enzyme catalyzes a chemical reaction by:
a. increasing the energy of the reaction.
b. lowering the energy of the products.
c. lowering the activation energy.
d. raising the energy of the products.
20. Which of the following statements regarding enzyme regulation is false?
a. Activators turn “on” an enzyme.
b. Competitive inhibitors permanently turn “off” an enzyme.
c. Enzymes can be inhibited at the active site or at an allosteric site.
d. In feedback inhibition, the products of a series of reactions inhibit an earlier
step to prevent over accumulation of a product.