At what partial pressure of oxygen do half the heme
groups in human blood have oxygen bound?
a. 30 mm Hg
b. 100 mm Hg
c. 70 mm Hg
d. 104 mm Hg
e. all of these
Answer: a
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________ is an aerobic chemolithotrophic process that ultimately oxidizes ammonia to nitrate, whereas ________ is a form of anaerobic respiration involving the oxidation of an organic compound using an oxidized nitrogenous compound, such as nitrate, as the terminal electron acceptor.
A. Denitrification; nitrification B. Ammonification; denitrification C. Nitrification; denitrification D. Ammonification; nitrification
In tracheophyte plants, water and dissolved minerals are conducted away from roots by
A. water vessels. B. stomata. C. phloem tubes. D. xylem tubes. E. chloroplasts.
Bovine spongiform encephalopathy is caused by a _____________
A. bacterium D. protein B. fungus E. lipid C. virus
Which cell type is phagocytic and can migrate out into body tissues to differentiate into macrophages?
A. basophils B. lymphocytes C. neutrophils D. monocytes E. eosinophils