A 17-year-old male with a severe eye infection admits that he does not clean his contact lenses as often as he should. His eye infection is most likely the result of which parasite?
a. Toxoplasma gondii
b. Isospora belli
c. Strongyloides stercoralis
d. Acanthamoeba spp.
D
The free-living amebae, Acanthamoeba spp., is linked to poor contact lens hygiene, which can result in eye infections.
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There is a group of invertebrate animals called rotifers, among which a particular group of species reproduces, as far as is known, only asexually. These rotifers, however, have survived a long evolutionary history without evidence of having been overcome
by excessive mutations. Since the rotifers develop from eggs, but asexually, what can you predict? A) The eggs and the zygotes are all haploid. B) The animals are all hermaphrodites. C) While asexual, both males and females are found in nature. D) All males can produce eggs. E) No fertile males can be found.
The subdividing of some category of similar
resources in a way that allows competing species to exist is
a. competitive exclusion. b. social parasitism. c. predation. d. mimicry. e. resource partitioning
Carbaminohemoglobin differs from hemoglobin in that carbaminohemoglobin
A) is found in blood plasma. B) binds carbon monoxide instead of carbon dioxide. C) is found in red blood cells. D) is bound to carbon dioxide. E) transports oxygen from the lungs to the cells.
Magnetic Resonance Imaging (MRI) quantifies (i) _______ in (ii) _______ utilizing magnetic field.
a) (i) calcium (ii) vessel b) (i) hydrogen, (ii) neuron c) (i) hydrogen (ii) vessel d) (i) calcium, (ii) neuron