Numerous cases of microcephaly have been observed in the newborn babies of women who were infected with Zika virus during pregnancy. This led to the proposed hypothesis that Zika virus was causing the birth defects. This is an example of
A. deductive reasoning.
B. theory development.
C. inductive reasoning.
D. hypothesis testing.
Answer: C
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In the tuberculin skin test, what would be the most likely reason why a positive test would NOT necessarily indicate an infection in progress in a patient who was born and grew up in the United States?
A. False-positives occur all the time. This might simply be an example of that. B. The TB skin test is a measure of reactivation of memory T cells. The memory T cells would be formed either during an active infection or would be remnants of a prior infection that may be cleared. Since the memory of the response persists, the test still shows positive, even though the patient is cleared of actual infection. C. Each person in the United States receives the BCG tuberculosis vaccine. This is an attenuated mycobacterium vaccine. The response to this vaccine makes us positive for the TB skin test, even though we may not have actually had a TB infection at any point in our lives. D. A positive TB skin test ALWAYS indicates a current, active infection.
As rainfall in an African savanna decreases, it would most likely change into
A. tiaga. B. desert. C. tropical rainforest. D. temperate forest. E. tundra.
Which of the following is commonly the source of leptospirosis?
A) infected animal urine B) infected animal bites C) humans infected with leptospirosis D) infected animal feces E) infected human urine
A higher concentration of solutes corresponds to a (higher/lower) concentration of water in a given solution.
Fill in the blank(s) with the appropriate word(s).