Answer the following questions true (T) or false (F)
1. Zoonotic diseases are spread from animals to humans.
2. The source of an infectious agent is the animate or inanimate habitat where the pathogen is naturally found.
3. The acute phase of an infectious disease, when the pathogen levels are the highest, is the most contagious stage of any pathogen.
1. TRUE
2. FALSE
3. FALSE
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A prokaryote that occupies a habitat consisting of a low pH is a(n)
A. basophile. B. hydrophile. C. thermophile. D. halophile. E. acidophile.
Features that contributed to success on land include a
__________ that protects spores. Fill in the blank(s) with the appropriate word(s).
A benign tumor differs from a malignant tumor in that a benign tumor
A) is cancerous. B) spreads from the original site. C) does not metastasize. D) never causes health problems.
Adult T-cell leukemia is thought to be caused by ________.
A. herpesviruses B. picornaviruses C. retroviruses D. parvoviruses