How does aspirin act to decrease the symptoms of inflammation?
A. it acts as an anti-prostaglandin.
B. it is an anti-toxoid for most microbial toxins.
C. it prevents complement activation.
D. it interferes with the action of interferons.
E. it blocks the release of histamine.
Answer: A
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The overuse of antibiotics has led to a form of antibiotic resistant tuberculosis. This has occurred as a result of:
a. directional selection within the bacterial population. b. stabilizing selection within the bacterial population. c. disruptive selection within the bacterial population. d. balanced polymorphism within the bacterial population. e. a heterozygote advantage within the bacterial population.
In a hypothetical situation, a bacterium lives on the surface of a leaf, where it obtains nutrition from the leaf's nonliving, waxy covering while inhibiting the growth of other microbes that are plant pathogens
If this bacterium gains access to the inside of a leaf, however, it causes a fatal disease in the plant. Once the plant dies, the bacterium and its offspring decompose the plant. What is the correct sequence of ecological roles played by the bacterium in the situation described here? 1. nutrient recycler 2. mutualist 3. commensal 4. pathogen 5. primary producer A) 1, 3, 4 B) 2, 3, 4 C) 2, 4, 1 D) 1, 2, 5
One of the reasons that pufferfish are a good species to compare to humans is because
A. they are so distantly related that it's easy to distinguish mutually conserved sequences. B. it is so easy to hybridize the two and investigate the consequences. C. they have been separated for so many millions of years and yet the gene sequence is almost identical. D. of the rapid response time in pufferfish to artificial selection. E. the introns are often identical.