Giardiasis involves
A. vector transmission.
B. symptoms of abdominal pain, flatulence, and diarrhea.
C. a protozoan that does not form cysts.
D. infection of the large intestine.
E. All of the choices are correct.
Answer: B
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Fluids should be processed for direct microscopic examination. If one organism is observed per oil immersion field, then at least _____ organisms per milliliter of specimen are present
a. 102 b. 103 c. 104 d. 105
Beta-N-Methylamino-L-Alanine, or BMAA, is a glutamate receptor agonist produced by cyanobacteria. Since Glu is an excitatory neurotransmitter, it is not surprising that BMAA is associated with neurological damage. Buildup of BMAA in fruit bats was hypothesized to cause neurodegenerative disease in islanders that fed on the bats. A recent study found high levels of BMAA in sharks, suggesting that consumption of shark fin soup is also dangerous. The researchers suggested that a secondary effect of BMAA may actually make these hazardous foods surprisingly desirable. What might this be?
A. Since BMAA is a Glu receptor agonist, it promotes incorporation of Glu into proteins, and has health-promoting effects. B. Since BMAA is derived from cyanobacteria, it provides unique nutrients not found in the animal or plant kingdom. C. Since BMAA is a Glu receptor agonist, it imparts a strong umami flavor that makes food more delicious. D. Since BMAA contains alanine, it improves protein synthesis by providing this rare nutrient. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about glutamate? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The main role of myoglobin in muscle fibers is to
a. magnify responses to neurotransmitters. b. sequester ions. c. synthesize ATP. d. store oxygen. e. enhance the strength of the power stroke.
Exposure to benzene is linked to ____
a. leukemia b. lung cancer c. bladder cancer d. skin cancer e. liver cancer