The tsetse fly is responsible for the spread of
A. African sleeping sickness.
B. Chagas' disease.
C. filariasis.
D. kala-azar.
E. toxoplasmosis.
Answer: A
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Salmonella typhimurium can change flagellar proteins to evade immune response by host systems. What is this process called?
A. lysogeny B. bacterial transduction C. phase variation D. transposition E. cointegration
Since 2008, grizzly bears (Ursus arctos horribilis) have been spotted farther north than their historic range. As a result, grizzly bear habitat now overlaps polar bear (Ursus maritimus) habitat. The two species of bears, which are capable of mating and producing viable offspring, are considered separate “ecological” species because historically they lived in different habitats and never met. However, in 2006 a hunter shot a wild grizzly-polar bear hybrid known as a grolar bear, the first wild hybrid ever found. This overlap is due to which of the following threats to biodiversity?
a. overharvesting b. habitat loss c. global climate change d. introduction of exotic species
Which of the following produces no seeds?
a. cycads b. conifers c. horsetails d. ginkgos e. tomatoes
Select the best response to the question. ? Hand hygiene with an alcohol-based hand rub is indicated in which of the following situations?
A) after eating B) before repositioning a patient in bed C) if hands are visibly soiled D) after using the restroom