Colonial cnidarians that exhibit both the polyp stage and the medusa stage in their life cycles are:
a. hydrozoans.
b. scyphozoans.
c. cubozoans.
d. anthozoans.
e. bryozoans.
A
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Individuals help sustain biodiversity by _____
a. reducing resource consumption b. reusing materials c. recycling materials d. all of these
Successful insertion of a DNA fragment into the polylinker region of pBluescript II is detected by
A) production of the enzyme ?-galactosidase. B) absence of the enzyme ?-galactosidase. C) the increased size of the plasmid. D) autoradiography. E) None of these
What has been a consequence of the disease caused by the chytrid Batrachochytrium dendrobatidis?
a. the extinction of many species of frogs b. the killing of trees in temperate forests c. sexual transmission in humans d. the killing of millions of humans each year
In mammals, advanced cognition is usually correlated with a large and very convoluted neocortex, but birds are capable of sophisticated cognition because they have _____
A) a more advanced cerebellum B) a cerebellum with several flat layers C) a pallium with neurons clustered into nuclei D) microvilli to increase the brain's surface area