Content Frame
Note for screen reader users: There is text between the form elements on this page. To be sure that you do not miss any text, use item by item navigation methods, rather than tabbing from form element to form element

Key Concepts Quiz

 

This activity contains 23 questions.

Question 1
1
Open Hint for Question 1 in a new window
The eukaryotic cell has multiple membrane-enclosed compartments. This evolutionary innovation provides what advantage to the cell?
 
End of Question 1


Question 2
2
Open Hint for Question 2 in a new window
Frequently, transplanted organs are rejected by the recipient's body. How is this reaction is related to plasma membranes?
 
End of Question 2


Question 3
3
Open Hint for Question 3 in a new window
Overall, membranes seem to have a great deal in common, but on closer inspection it is revealed that membranes of different cells have unique properties. What is the primary component of membranes that gives membranes cell-specific properties?
 
End of Question 3


Question 4
4
Open Hint for Question 4 in a new window
In an oil-based, nonpolar environment phospholipds would arrange themselves so that they _____.
 
End of Question 4


Question 5
5
Open Hint for Question 5 in a new window
What controls the direction of a molecule, such as oxygen, involved in passive transport?
 
End of Question 5


Question 6
6
Open Hint for Question 6 in a new window
Osmosis is often viewed incorrectly as a process driven directly by differences in solute concentration across a selectively permeable membrane. What really drives osmosis?
 
End of Question 6


Question 7
7
Open Hint for Question 7 in a new window
Utah's Great Salt Lake has an average salinity seven times higher than that of the oceans. Very few multicellular organisms live in this harsh environment. An example is the brine shrimp, which must devote a large portion of its metabolic energy to osmoregulation. These brine shrimp must _____.
 
End of Question 7


Question 8
8
Open Hint for Question 8 in a new window
When placed in a hypotonic environment, where the solute concentration is below that of the cell, a houseplant will _____.
 
End of Question 8


Question 9
9
Open Hint for Question 9 in a new window
You're on the pilot episode of a new reality show called "The Transport Factor." The host hands you three different amino acids, four different sugars, and two different ions. Then the host shouts, "How many different proteins does the cell need to move these molecules across the plasma membrane using facilitated transport?" Quickly, you correctly respond: _____.
 
End of Question 9


Question 10
10
Open Hint for Question 10 in a new window
Which of the following is an accurate comparison of active transport and facilitated diffusion?
 
End of Question 10


Question 11
11
Open Hint for Question 11 in a new window
Macrophages are white blood cells that roam the body searching for invading microbes. Inside macrophage vacuoles these invaders are destroyed. How do the microbes get inside the macrophages?
 
End of Question 11


Question 12
12
Open Hint for Question 12 in a new window
New drugs are being developed to lower levels of circulating cholesterol. A successful drug would be one that _____.
 
End of Question 12


Question 13
13
Open Hint for Question 13 in a new window
Cells store energy that they use for work in the _____.
 
End of Question 13


Question 14
14
Open Hint for Question 14 in a new window
Light is _____ energy, which is converted by plants into molecules, which possess _____ energy.
 
End of Question 14


Question 15
15
Open Hint for Question 15 in a new window
What happens to the chemical energy that is extracted from molecules by cellular activities but that is not used for cellular work?
 
End of Question 15


Question 16
16
Open Hint for Question 16 in a new window
In plant cells, carbon dioxide and water are joined to form carbohydrates. Plant cells can also break down carbohydrates such as glucose, releasing carbon dioxide, water, and energy. No one has ever observed such reactions between water and carbon dioxide outside of living cells. What allows simple molecules to assemble into more complex molecules, and also disassemble, in cells but not in other, nonbiological environments?
 
End of Question 16


Question 17
17
Open Hint for Question 17 in a new window
In a theoretical world where all things are possible, how could you increase the amount of energy that could be stored in a molecule of ATP?
 
End of Question 17


Question 18
18
Open Hint for Question 18 in a new window
Table sugar, or sucrose, is quite stable, and left on its own at room or even human body temperature, breakdown occurs very slowly. The breakdown of sucrose into the simple sugars fructose and glucose is an exergonic reaction. Sucrase, an enzyme, can increase the reaction rate at least one-million-fold. How does the net amount of energy released during the breakdown of sucrose compare between a spontaneous reaction and one catalyzed by sucrase?
 
End of Question 18


Question 19
19
Open Hint for Question 19 in a new window
A pharmaceutical company wishes to focus on an enzyme to develop new medications. What type of study would be of the greatest benefit?
 
End of Question 19


Question 20
20
Open Hint for Question 20 in a new window
Which statement regarding enzyme function is true?
 
End of Question 20


Question 21
21
Open Hint for Question 21 in a new window
The synthesis of an amino acid follows this pathway: precursor A → intermediate B → amino acid C. Each reaction is catalyzed by a different enzyme. This metabolic pathway is controlled by feedback inhibition with amino acid C inhibiting the conversion of precursor A to intermediate B. Amino acid C acts as a _____ of the first enzyme in the pathway.
 
End of Question 21


Question 22
22
Open Hint for Question 22 in a new window
Antibiotics—for example, penicillin—cannot be used to treat viral infections, such as the common cold. Why?
 
End of Question 22


Question 23
23
Open Hint for Question 23 in a new window
Azidothymidine (AZT) is an antiretroviral drug used in the treatment of HIV. It shares a structural similarity to a nucleotide. What might be the mode of action for this drug?
 
End of Question 23


Clear Answers/Start Over





Pearson Copyright © 1995 - 2011 Pearson Education . All rights reserved.
Legal Notice | Privacy Policy | Permissions

[Return to the Top of this Page]