After a trip to several South American countries, a middle-aged man becomes ill. He becomes anemic, loses weight, and runs a fever. The clinician notes a recently healed sore near his nose. Microscopic examination of a blood smear does not reveal anything other than the anemia. What parasitic infection is consistent with this scenario?
A) malaria
B) leishmaniasis
C) Chagas' disease
D) giardiasis
E) balantidiasis
B
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What is considered to be the primary method of succession in the marine intertidal zone?
A. facilitation. B. submission. C. logistic growth. D. facilitated growth. E. inhibition.
Which of the following are adaptations to land of both gymnosperms and angiosperms but are lacking in ferns and mosses?
a. pollen and seeds b. fruits and flowers c. vascular system d. true roots, stems, and leaves e. spores
What is the frequency of the b allele?
A) 0.6 B) 0.4 C) 0.36 D) 0.48 E) 0.16
Pasteurization is a technique in which heat is applied to liquids to kill potential agents of infection and spoilage, while at the same time attempting to retain the liquid's flavor and food value.
a. true b. false