Which of the following is not a beta-lactam drug?
A) carbapenem
B) quinolone
C) cephalosporin
D) penicillin
E) monobactam
Answer: B
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The bright coloration of the various species of poison arrow frogs from the Amazon is
A. receptivity. B. aposematic. C. intimidation. D. Mullerian mimicry. E. Batesian mimicry.
By the year 1900, the American bison had been hunted to near extinction. From those that survived the slaughter, breeding programs have increased the population of American bison to close to 500, 000 today. This is an example of
a. artificial selection. b. the founder effect. c. the bottleneck effect. d. the Red Queen effect. e. gene flow.
Considerable evidence indicates that the null model of community structure is incorrect because
A) each species responds independently of other species to the prevailing physical environment. B) interactions among species have no significant influence on community structure. C) when one species is removed, the populations of the other species are unaffected. D) species interactions modify the fundamental niche of the species involved, influencing their relative abundance and, in some cases, their distribution.
Which of the following is found within the cochlea?
A. stapes B. semicircular canals C. incus D. tympanic membrane E. spiral organ