The preferred fixative for the Warthin-Starry technique is:

a) Carnoy
b) Bouin solution
c) absolute alcohol
d) 10% buffered formalin


Answer: d) 10% buffered formalin

Biology & Microbiology

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Which of the following organisms are resistant to destruction by typical disinfection methods?

A. Endospores of Bacillus and Clostridium B. Pseudomonas C. Non-enveloped viruses D. Mycobacterium spp. E. All of the choices are correct.

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You are a farmer that grows corn. You are offered a genetically modified variety of corn that is 100

percent resistant to corn borers. You have to decide what proportion of your field you should plant in resistant corn versus a variety that is susceptible to corn borers. Explain why you might choose one of the following proportions of resistant to susceptible: 100:0, 90:10, 75:25, or 50:50.

What will be an ideal response?

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Long-term exposure to cold can alter metabolism and encourage __________ in which brown adipose

tissue produces heat. Fill in the blank(s) with the appropriate word(s).

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Which of the following gastrointestinal responses is part of the nonspecific host response?

A) Mucociliary blanket B) Peristalsis C) Insulin production D) Decreasing acid production

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