Antigens that elicit allergic reactions are called ________.
A. superantigens
B. autoantigens
C. heterophilic antigens
D. allergens
Answer: D
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When geographic variation occurs among the members of a species, individuals
a. may be mistaken for separate species. b. cannot mate successfully. c. cannot produce offspring with intermediate characteristics. d. may be absent in most locations. e. may be from different subpopulations
All cells produce waste products during the normal course of their metabolic activities. These wastes called _______ may contribute to cell aging and death.
Fill in the blank(s) with the appropriate word(s).
Biomagnification occurs with chemicals that
A. dissolve in only acidic solvents. B. dissolve in water. C. are not readily degraded and dissolve in fat. D. are not readily degraded and dissolve in water. E. dissolve in only basic solvents.
The type of learning that is associated with an organism solving a problem without any prior experiences with the situation is called
A. associative learning. B. insight learning. C. imprinting. D. operant conditioning.