Gas exchange in mammalian lungs occurs in the

a. villi
b. anterior air sacs
c. posterior air sacs
d. bronchioles
e. alveoli


e

Biology & Microbiology

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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.

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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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology