A patient with acquired immunodeficiency syndrome (AIDS) notices skin lesions on his back that have begun to ulcerate. Upon physical examination, his physician also notices hepatomegaly that is most likely caused by hepatitis. The physician prescribes antifungal therapy to prevent the dissemination of which of the following yeasts?
a. C. albicans
b. C. neoformans
c. C. glabrata
d. C. tropicalis
B
In the patient who is immunocompromised, disseminated disease with meningitis caused by C. neoformans is common. Disseminated cryptococcosis and cryptococcal meningitis became well recognized in patients with AIDS, and both infections remain important causes of morbidity and mortality in patients in resource-poor countries who do not have access to highly active antire-troviral therapy (HAART). Patients with disseminated infection may exhibit painless papular skin lesions that may ulcerate. Other less common manifestations of cryptococcosis include en-docarditis, hepatitis, renal infection, and pleural effusion.
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Suppose you are carrying out a series of crosses with an insect where the mechanism of sex determination is unknown. You discover a mutant female with short bristles and decide to cross it with a wild type male that has normal bristles. Half of the F1 progeny have short bristles but all of these short-bristled F1 progeny are males. Based on these results, a valid hypothesis would be
A. Males are ZW, females are ZZ, and short bristles are caused by a dominant allele on the Z chromosome. B. Males are ZZ, females are ZW, and short bristles are caused by a recessive allele on the Z chromosome. C. Males are ZZ, females are ZW, and short bristles are caused by a dominant allele on the W chromosome. D. Males are ZZ, females are ZW, and short bristles are caused by a dominant allele on the Z chromosome. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about sex determination systems? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
As you saw while performing thin layer chromatography, photosynthetic pigments are mostly hydrophobic substances soluble in organic solvents but not in water-based solutions. How does this feature explain the location of these pigments within the chloroplast?
What will be an ideal response?
Which environment would be most likely to produce trees without annual rings?
a. tropical rain forest b. northern evergreen forest c. areas with alternating wet and dry seasons d. temperate-deciduous forests e. annual rings are characteristic of all trees
Why must tropomyosin cover the thin filament in just the right position before the muscle can relax?
A) It is needed in the proper location, or ATP cannot be used. B) It covers the myosin-binding sites and, if left exposed, will allow the myosin to bind and pull. C) Without tropomyosin in the correct position, calcium cannot be released. D) It has a particular binding place that facilitates the removal of calcium.