Stage I of trypanosomiasis characteristically involves systemic trypanosomiasis infection without central nervous system (CNS) involvement. Lymphadenopathy is also a feature of this disease. The trypomastigotes of which protozoa are involved?
a. T. cruzi
b. T. rangeli
c. T. brucei rhodesiense
d. T. brucei gambiense
D
The trypomastigotes of T. brucei gambiense enter the bloodstream, causing a low-grade parasi-temia that may continue for months with the patient remaining asymptomatic. This is considered stage I disease, during which the patient can have systemic trypanosomiasis without CNS in-volvement. During this time, the parasites may be difficult to detect, even by thick blood film examinations. The infection may self-cure during this period without the development of symp-toms or lymph node invasion.
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An anabolic reaction decreases entropy within the system because the reaction results in a more ordered macromolecule
A. true B. false
Exoskeletons are used for movement by which of the following animals?
A. insects B. cnidarians C. crustaceans D. humans E. insects and crustaceans
Mammals that have and care for only a few offspring are likely to exhibit a:
a. type I survivorship curve. b. type II survivorship curve. c. type III survivorship curve. d. type IV survivorship curve.
Science involves all of the following with one
exception. Select the exception.
a. the systematic study of the observable world. b. using objective evidence to study objects and events. c. collecting data. d. devising observations and experiments to test predictions. e. using the personal biases of the experimenter to draw conclusions..