Gas exchange in mammalian lungs occurs in the
a. villi
b. anterior air sacs
c. posterior air sacs
d. bronchioles
e. alveoli
e
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Proteins that react specifically with the chemical structures in the antigen that induced them are called
A. determinants. B. antibodies. C. proteases. D. macroproteins.
Nitrogen gas is first converted into ___ by
certain___ before it enters the land nitrogen cycle.
a. nitrate...bacteria b. ammonium...bacteria c. elemental nitrogen...bacteria d. nitrate...bacteria and fungi e. ammonium...bacteria and fungi
Nitrates and nitrites are used in cured meats to prevent ________.
A. botulism intoxication B. S. aureus food poisoning C. infection from fruits and nuts D. mold growth
Answer the following questions true (T) or false (F)
1. AIDS is an autoimmune disease. 2. Therapy involving Toll-Like Receptors may be useful in treating some autoimmune disorders and cancers. 3. The blood consists entirely of blood cells and water.