The relationship above is
a. a parasitic association.
b. predation.
c. resource partitioning.
d. a mutualistic association.
e. none of these
D
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During muscular contraction, cross-bridges form between _____ and _____ .
A. actin, myosin B. actin, tropomyosin C. myosin, troponin D. myosin, tropomyosin E. troponin, calmodulin
Under the Biological Speces Concept, what criterion is used to assign populations of organisms to the same biological species?
A. Being able to interbreed and produce fertile offspring B. A very similar appearance C. Having 99% of their genes in common D. Responding the the environment in the same way
The normal hosts for St. Louis encephalitis virus are
A) birds. B) small mammals. C) horses. D) humans. E) horses and humans.
What is the difference between an intolerance and an allergy?
A) Intolerances produce symptoms that last several days, while patients having an allergic reaction recover in less than 24 hours. B) Intolerances can change over a patient's lifetime, but allergic reactions do not change throughout a patient's life. C) Intolerances tend to have a delayed onset of symptoms, while allergic reactions occur rapidly. D) Intolerances occur due to a patient's exposure to the environment, while allergic reactions are genetically determined. E) Intolerances have mild symptoms, while allergic reactions can be life threatening.