Pertussis has the following characteristics, except:
A. pathogen has virulence factors to destroy the action of respiratory cilia.
B. catarrhal stage has persistent, hacking coughs with "whoops".
C. early stage resembles a cold with nasal discharge and sneezing.
D. DTaP immunization will prevent it.
E. transmission is by respiratory droplets.
Answer: B. catarrhal stage has persistent, hacking coughs with "whoops".
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Crop sunflowers are attacked by many fungal pathogens, such as downy mildew and Sclerotinia, resulting in economic losses of millions of dollars per year. What genes would be best to target for the development of new fungus-killing crop treatments (fungicides)?
A. Genes encoding metabolite proteins that are shared by downy mildew, Sclerotinia, and humans, but absent in sunflower. B. Genes encoding basic development proteins that are shared by downy mildew, Sclerotinia, sunflower, and humans. C. Genes encoding chitin proteins that are shared by downy mildew and Sclerotinia, but absent in sunflower and humans. D. Genes encoding growth proteins that are shared by downy mildew, Sclerotinia, and sunflower, but absent in humans.
A goiter is an enlarged form of the ____ gland
a. adrenal b. pancreas c. thyroid d. parathyroid e. thymus
The molecules formed by an enzyme-catalyzed reaction are called ________.
Fill in the blank(s) with the appropriate word(s).
The use of the arsenic compound Salvarsan as a treatment for syphilis is credited to ________.
A. Chain B. Waksman C. Ehrlich D. Fleming