What is the most important barrier protecting the inner contents of an animal cell from its exterior environment?
a. the cellular membrane
b. the cell wall
c. the nucleus
d. the cytoskeleton
e. Both a) and b) are correct.
Ans: a. the cellular membrane
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The total solute concentration of a solution of water and other substances (salts, proteins, etc.) is referred to specifically as its
A. osmolarity. B. tonicity. C. salinity. D. specific gravity. E. density.
The pathological disorders associated with type I diabetes results from the inability to
A. produce pancreatic insulin. B. counteract rises in blood glucose levels. C. counteract drops in blood glucose levels. D. produce pancreatic insulin to counteract rises in blood glucose levels. E. produce pancreatic insulin to counteract drops in blood glucose levels.
Viruses used in live viral vaccinations have the potential to revert to disease-causing forms within a host, effectively causing the diseases they were intended to prevent. What is the name for this reversion?
a. back mutation b. reverse lysis c. retroviral d. devolution
How many bases does it take to code for a single amino acid?
A) four B) six C) two D) three E) one