How does the life cycle for the Trypanosoma that causes sleeping sickness differ from the one that causes Chagas' disease?
What will be an ideal response?
Sleeping sickness is caused by T. brucei, and Chagas' disease is caused by T. cruzi, which differ from each other in many ways. First, T. cruzi matures in the hindgut of the kissing bug, whereas T. brucei matures in the salivary gland of the tsetse fly. T. brucei is injected directly through the vector's bite, while T. cruzi enters the host when the vector's feces are rubbed into a bite wound. T. cruzi has an intracellular stage, whereas T. brucei does not. T. brucei remains in fluid compartments of the body (blood and cerebrospinal fluid), whereas T. cruzi penetrates tissues throughout the body, especially the cardiovascular system.
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The number of animal species now known is about
A. 10 million. B. 100 million. C. 1 million. D. 15 million. E. 5 million.
________ occurs as ________ builds up in the system if Enzyme A is nonfunctional because of an inherited mutation. 
A. albinism; melanin B. androgen insensitivity; tyrosine C. xeroderma pigmentosum; tyrosine D. phenylketonuria; phenyalanine
The hobbit-sized hominin whose fossilized remains were recently discovered on a remote oceanic island belonged to the species
A) Homo erectus. B) Homo floresiensis. C) Homo neanderthalensis. D) Homo sapiens. E) Homo habilis.
Two bacterial strains have the same genes for metabolizing a carbohydrate, but one is wild-type for a regulatory inducer while the other does not produce the inducer. Which of the following statements is CORRECT with regard to the metabolism of the bacteria?
A. The two bacterial strains have the same phenotype. B. The two bacterial strains have different phenotypes. C. The genotypes and phenotypes of the two bacterial strains are the same. D. The two bacterial strains have the same phenotype but have different genotypes. E)The two bacterial strains differ in both genotype and phenotype.