A ________ infection is one in which the virus quits reproducing and remains dormant for a period before becoming active again.
A. slow virus
B. latent
C. persistent
D. None of the choices are correct.
Answer: B
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Which of the following is a source of human-fixed nitrogen?
I) industrially produced fertilizers II) cultivation of soybeans III) irrigation agriculture A) only I B) only II C) only III D) only II and III E) only I and II
Which of the following pathogens produce enterotoxins?
A) Bacillus cereus and certain serotypes of E. coli B) Clostridium difficile and Clostridium perfringens C) Salmonella spp. and Shigella spp. D) all of the above
Hagfishes are differentiated from lampreys and all other fishes in that:a
hagfishes do not have gills. b. hagfishes lack a jaw. c. hagfishes are parasitic. d. hagfishes lack vertebrae. e. hagfishes have notochords.
In the United States, solid municipal waste can no longer be dumped ____.
A. in garbage dumps B. in biodegradable bags C. in garbage bags D. in landfills E. in the sea