A section of lung from a patient with sputum cultures positive for acid-fast organisms is negative when stained with the Ziehl-Neelsen stain. To confirm that no organisms are present in the lung tissue, it would be best to stain new sections with:
a) auramine-rhodamine
b) Giemsa
c) Gram
d) Dieterle
Answer: a) auramine-rhodamine
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The ____ prevents food and fluids from
entering the ____. a. epiglottis; larynx b. pharynx; larynx c. epiglottis; esophagus d. pharynx; trachea e. larynx; pharynx
According to the Red Queen hypothesis,
A) the population density of a predator depends on the population density of its prey. B) natural selection should favor the most efficient foragers. C) prey must continually evolve means of avoiding capture to avoid extinction. D) most predators consume a varied diet in order to meet their nutritional requirements.
The arthropod skeleton is composed of ________
A) cellulose B) peptidoglycan C) chitin D) glycogen