The drug used for several protozoan infections is ________.
A. nystatin
B. amphotericin B
C. sulfa drugs
D. metronidazole
E. griseofulvin
Answer: D
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The recessive allele that causes phenylketonuria (PKU) is harmful, except when an infant's diet has appropriate levels of the amino acid phenylalanine. What maintains the presence of this harmful allele in a population's gene pool?
A) heterozygote advantage B) stabilizing selection C) diploidy D) balancing selection
Which of the following has the strongest influence on the ability of a male white-crowned sparrow to sing at all?
a. acoustical stimuli b. social interaction with any songbird c. visual stimuli d. social interaction with other white-crowned sparrows e. innate behaviors
Almost every element of bird anatomy is modified for what?
A) laying eggs B) eating seeds C) enhancement of flight D) singing unique songs
Which of the following statements are fundamental to the clonal-selection theory of how the adaptive immune system functions? I) Each lymphocyte has a unique membrane receptor that recognizes one antigen
II) When the lymphocyte binds an antigen, it is activated and begins dividing to form many identical copies of itself. III) Cloned lymphocytes have slight differences and are selected by the spleen for removal if they do not bind an antigen. IV) Cloned cells descend from an activated lymphocyte and persist even after the pathogen is eliminated. A) only I and III B) only II and IV C) only I, II, and IV D) only II, III, and IV