Which property of antibodies is the basis for complement fixation tests?
A. agglutination
B. opsonization
C. neutralization
D. direct killing
E. complement activation
Answer: E
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The pH of seawater is important to living organisms because:
a. it can affect the functioning of enzymes. b. it can interfere with metabolism. c. it can affect growth. d. All the above.
Which of the following receptors detect deep transient pressure, and where are they located?
a. Golgi tendon organs, muscle and connective tissues b. hair receptors, hairy skin c. Pacinian corpuscles, deep dermis d. Merkel’s disks, near the base of the epidermis
The greatest concentration of nitrogen on the planet Earth is found in:
a. living organisms, including bacteria b. the atmosphere c. soil minerals d. fossil fuels e. oceans
A fish circulatory system is indicated by
a. A. b. B. c. C. d. both A and B. e. none of these.