Spring has arrived, and you notice your neighbors are cutting their grass. When you walk outside to check if your mail has arrived, your eyes begin to water and feel itchy. You are more than likely experiencing
A) an overreaction to pollen.
B) a reaction due to an autoimmune disease.
C) inflammation.
D) a secondary immune response.
Answer: A
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In an enzyme-catalyzed reaction, the reactant is called the
A. coenzyme B. catalyst C. substrate D. product
The production of second messengers in signal transduction offers at least two advantages, speed and
A. specificity. B. amplification. C. one-to-one stochiometry. D. reversibility. E. affinity.
When imbalances occur in the sex ratio of sexual species that have two sexes (that is, other than a 50:50 ratio), the members of the minority sex often receive a greater proportion of care and resources from parents than do the offspring of the
majority sex. This is most clearly an example of _____. A) sexual selection B) balancing selection C) stabilizing selection D) frequency-dependent selection
In a prokaryotic cell, all of the following are functions of a capsule EXCEPT:
a. attachment to environment surfaces b. attachment to body tissues c. protection from phagocytosis d. movement