In all but the simplest animals, osmoregulation and excretion is carried out using tubules that are
a. specialized blood vessels.
b. part of the lining of the digestive tract.
c. modifications of the respiratory and digestive systems.
d. associated with the surface of the skin.
e. formed from transport epithelium.
E
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Most innate immune responses rely on
A. recognition of specific antigens. B. pathogens being engulfed and destroyed. C. plasma cells to secrete antibodies. D. IgM antibodies. E. clonal selection to replicate specific lymphocytes.
Who is credited with the discovery of prions as a new biological principle of infection?
a. Anton van Leeuwenhoek b. Dmitrii Ivanowsky c. Stanley Prusiner d. Stanley Brenner e. Carl Woese
Prokaryotes that require high salt concentrations would be classified as
A. archaeans. B. bacteria. C. thermoacidophiles. D. viruses. E. cyanobacteria.
All parts of the biosphere are linked by
A) high temperatures and low annual rainfall. B) the global water cycle and nutrient cycles. C) acid soil pH and fast wind speed.