In which of these diseases do bird droppings provide nutrients, especially nitrogen, to the fungus?
a) Histoplasmosis
b) Pneumocystispneumonia
c) Coccidioidomycosis
d) Aspergillosis
Answer: a) Histoplasmosis
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Known to cause an inflammatory bowel disease referred to as Johne's disease in cattle, sheep, and goats, which organism has been isolated from the bowel mucosa of patients with Crohn dis-ease?
a. M. paratuberculosis b. M. avium-intracellulare c. Mycobacterium phlei d. Mycobacterium lepraemurium
Chemical cues that help guide a developing pollen tube toward an ovule are released by the ____.
a. antipodal cells b. synergids c. egg d. central cell e. sperm
Which of the following is the most important natural auxin?
a. abscisic acid b. gibberellic acid c. jasmonic acid d. indoleacetic acid e. salicylic acid
To maintain a balanced water cycle, what needs to occur?
a. irrigation for agriculture must stop b. water withdrawals cannot exceed replenishment c. per-capita consumption must decrease d. per-capita consumption must increase e. water withdrawals must exceed replenishment