Biol 212 Worksheet:
Exam Review I
Supplemental Instruction
Iowa State University
Leader:
Course:
Instructor:
Date:
Greg
Biology 212 (2)
Kukday
9/13/15
1. Fluorine has an atomic number of 9 and a mass number of 19. How many protons,
neutrons, and electrons does a neutral Fluorine have?
a. 10 Protons, 9 Neutrons, 19 Electrons
b. 9 Protons, 19 Neutrons, 9 Electrons
c. 9 Protons, 10 Neutrons, 9 Electrons
d. 19 Protons, 9 Neutrons, 9 Electrons
2. Which of the following statements is false?
a. Two different elements always have a different number of protons.
b. When net charge is zero, the number of protons equals number of electrons.
c. The same element can have atoms with different number of neutrons.
d. An atom can ionize by gaining or losing a proton.
3. Which of the following bonds is the weakest?
a. Ionic
b. Hydrogen
c. Non-polar Covalent
d. Polar Covalent
4. A cation occurs when a neutral atom or molecule…
a. Loses an electron
b. Gains a neutron
c. Loses a proton
d. Gains an electron
5. Which of the following statements regarding water is true?
a. Due to its hydrogen bonding, water is a very non-polar molecule.
b. Because water is cohesive, it tends to stick to other substances.
c. Water has a high surface tension, so light objects do not break the surface.
d. Ice (solid water) is denser than liquid water.
6. 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.
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c. Hydrophilic molecules form micelles when dissolved in water.
d. When salt dissolves in water, its ionic bonds break.
7. Which of the following represents a basic solution?
a. [H+] = 3.69 * 10-6
b. [OH-] = 4.80 * 10-7
c. [H+] = 1.00 * 10-7
d. [OH-] = 6.26 * 10-8
8. The side chain of tyrosine is best classified as…
a. Polar uncharged
b. Nonpolar
c. Basic
d. Acidic
9. What is the correct name for the reaction that breaks polymers apart?
a. Hydrolysis
b. Condensation
c. Anabolism
d. Dehydration
10. Two amino acids are joined together by what bond?
a. Phosphodiester
b. Peptide
c. Glycosidic Linkage
d. Ester
11. Which of the following levels of protein structure is correctly defined?
a. Primary – Interactions such as disulfide and ionic bonds
b. Secondary – Hydrogen bonding to form structures such as alpha helices
c. Tertiary – The bonding of two or more polypeptide subunits
d. Quaternary – The actual order of the individual amino acids
12. Which of the following is not a component of a nucleotide?
a. Nitrate Group
b. Five-Carbon Sugar
c. Phosphate Group
d. Nitrogenous Base
13. Which of the following accurately describes a difference between DNA and RNA?
a. DNA is composed of a five carbon sugar, while RNA has a six carbon sugar
b. RNA is significantly less reactive than DNA
c. While DNA is double stranded, RNA may be single stranded
d. DNA is composed of 4 bases (A,T,C,G), while RNA contains 5 (A,T,C,G,U).
14. Which of the following is not a characteristic of RNA secondary structure?
a. Hairpins
b. Stems
c. Loops
d. Rings
15. The general formula for a carbohydrate is…
a. C2n(H2O)n
b. Cn(H2O)n
c. C(NO)n
d. (CH3)n(OH)n
16. Which of the following is not a disaccharide?
a. Maltose
b. Galactose
c. Sucrose
d. Lactose
17. Which of the following is not an example of a complex carbohydrate?
a. Starch
b. Cellulose
c. Steroid
d. Glycogen
18. 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.
19. A fat’s structure is best described as…
a. A thymine molecule bonded to a fatty acid
b. A phosphate group bonded to two fatty acids
c. A glycerol molecule bonded to three fatty acids
d. A carbon molecule bonded to four fatty acids
20. A steroid’s structure is best described as…
a. A long hydrocarbon chain with a polar group on one end
b. Four rings fused together with assorted functional groups attached
c. Three phosphate groups attached to a nitrogen containing ring
d. A five carbon sugar with at least three functional groups attached
21. 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.
22. What is the name of the structure that phospholipids form when placed in water?
a. Ring
b. Liposome
c. Micelle
d. Ball
23. 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
24. 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.
25. 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.
26. What is the BEST name for the movement of water across a lipid bilayer?
a. Osmosis
b. Diffusion
c. Facilitated Diffusion
d. Lysis
27. 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.
28. Which of the following terms refers to the swelling and eventual bursting of a cell?
a. Crenation
b. Osmolysis
c. Plasmolysis
d. Glycolysis
29. Which of the following is necessary for a protein to be considered integral?
a. Only be located on one side of a membrane
b. Be required for the cell’s function
c. Be hydrophobic
d. Span the membrane
30. Which would be most appropriate for ions diffusing down their electrochemical
gradients?
a. Pumps
b. Carrier protein
c. Ion channel
d. Antiporter
31. 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.
32. Which of the following structures is not correctly matched with its function?
a. Ribosome – protein synthesis
b. Fimbria – movement
c. Cell wall – external support
d. Cytoskeleton – internal support
33. 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
34. Within the nucleus, where does ribosomal RNA synthesis take place?
a. Nuclear Envelope
b. Nuclear Lamina
c. Mid-nucleus
d. Nucleolus
35. 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.