Which feature unites paramecia, malarial parasites, and dinoflagellates into a single group?
A. The type of ribosomes
B. The possession of alveoli
C. The presence of a nucleus
D. A parasitic life style
E. The use of cilia
Answer: B
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Why do scientists consider HIV to be an emerging virus?
A) HIV infected humans long before the 1980s, but it has now mutated to a more deadly form. B) HIV mutates rapidly making the virus very different from HIV in the early 1980s. C) HIV suddenly became apparent and widespread in the 1980s. D) HIV is now starting to cause diseases other than AIDS, such as rare types of cancers and pneumonias.
Unlike endurance training, weight lifting will
a. convert slow muscle fibers to fast muscle fibers. b. convert fast muscle fibers to slow muscle fibers. c. convert fast muscle fibers from the anaerobic to the aerobic type. d. convert fast muscle fibers from the aerobic to the anaerobic type. e. convert fat to muscle fibers.
In an ecosystem
A. both energy and nutrients cycle. B. energy flows and nutrients cycle. C. energy cycles and nutrients flow. D. both energy and nutrients flow. E. energy is contained with nutrient cycles.
Which category of plant second metabolites includes stimulants like caffeine, nicotine, and cocaine?
A. alkaloids B. phenolics C. tannins D. terpenes E. cyanogenic glycosides