BIO 353 - Cell Biology Exam 2 Version B, BIO353 Exam 2 (100 points)
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Course
BIO 353
Institution
Rasmussen College
BIO 353 - Cell Biology Spring 2019 Exam 2 (100 points) Version A This is a closed-book exam. Collaboration, or the use of books, notes, or handouts, is not allowed. Please turn off and put away all cell phones, pagers, music players, and other electronic devices. The exam consists of 50 multiple- c...
This is a closed-book exam. Collaboration, or the use of books, notes, or handouts, is not allowed. Please
turn off and put away all cell phones, pagers, music players, and other electronic devices.
The exam consists of 50 multiple-choice questions. The questions are worth 2 points each, for a total of 100
points. Select the best answer to each question and enter your answer on a Scantron form. Be sure to
indicate on the Scantron form whether you have version A or version B of the exam. If you make a mistake,
be careful to erase the mistake completely.
Part 1: Membrane Structure and Function
1. Which ONE of the following is a function of the plasma membrane?
a. Breaks down lipids, carbohydrates, and proteins from foods
b. Stores water, salt, proteins, and carbohydrates
c. Regulates which materials enter and leave the cell
d. Keeps the cell wall in place
2. Which ONE of the following is TRUE regarding cell membranes?
a. Cell membranes are inflexible due to the presence of protein molecules
b. Cell membranes are relatively impermeable to large water-soluble molecules due to the
presence of the lipid bilayer
c. Cell membranes contain cholesterol molecules which can act as cell receptors
d. Cell membranes allow substances to pass through only by active transport
3. Which ONE of the following statements is TRUE regarding phospholipids in the plasma membrane?
a. The non-polar tails face outward and are hydrophobic
b. The polar heads face outward and are hydrophobic
c. The polar heads face inward and are hydrophobic
d. The non-polar tails face inward and are hydrophobic
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,4. The terms phosphatidyl serine and phosphatidyl ethanolamine refer to membrane lipids that differ in
their_________________.
a. polar group
b. fatty acids
c. backbone molecule
d. overall polarity
5. True or false: Phosphlolipids in a lipid bilayer commonly diffuse laterally within a membrane.
a. False
b. True
6. In general, increasing the number of double bonds in the fatty acid tails of a
phospholipid______________.
a. decreases membrane fluidity.
b. increases membrane fluidity.
c. decreases their lateral mobility in the membrane
d. increases the likelihood of their flipping from one leaflet to the other.
7. Which ONE of the following statements is FALSE regarding cholesterol?
a. Cholesterol can increase membrane fluidity by pushing apart phospholipids.
b. Cholesterol can decrease membrane fluidity by restricting phospholipid movement.
c. Cholesterol can damage a cell membrane by disrupting membrane proteins.
d. Cholesterol can be inserted in between phospholipids in a membrane.
8. How is the mobility of membrane proteins most often restricted?
a. Binding to membrane phospholipids.
b. Binding to groups of carbohydrates.
c. Binding to cholesterol.
d. Binding to proteins inside the cell.
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, 9. Carbohydrates in a membrane________________.
a. normally project towards the cytoplasm.
b. normally project towards the extracellular environment.
c. play no role in the function of the membrane.
d. are randomly joined to lipids or proteins.
10. Which ONE of the following is a major function of the carbohydrate group associated with plasma
membranes?
a. ATP formation.
b. binding of specific hormones.
c. cell-cell recognition.
d. enzyme catalysis
11. True or false: Membrane proteins cannot function as enzymes
a. False
b. True
Questions 12 and 13 refer to the following figure showing the activity of a protein that can flip lipids
from one side of a membrane to the other.
12. What is one important consequence of the activity of the protein shown above?
a. The membrane is unstable and has no consistent lipid composition.
b. Cellular membranes typically contain only one type of phospholipid.
c. The two leaflets of the bilayer contain only one type of phospholipid.
d. The two leaflets of the bilayer contain different sets of phospholipids.
13. What type of protein is shown in the image above?
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