Enterobius vermicularis is
A. often fatal in heavy infestations.
B. a whipworm.
C. common only to the tropics and subtropics.
D. an intestinal worm that easily contaminates fingers and fomites.
E. All of the choices are correct.
Answer: D
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When DNA probes are used to identify bacterial DNA similarities by hybridization, the probe DNA is heated and the template DNA is treated to separate the two strands.Why would the probe DNA be heated?
A. This is the only way to properly label the probe DNA. B. The probe may contain portions that are double-stranded. Heating it up breaks any possible hydrogen bonds that may have formed allowing the single-stranded sequences to hybridize with their complementary targets. C. Heating it up activates the tag on the probe DNA before it hybridizes to the bacterial template DNA. D. DNA hybridization can only take place at high temperatures, so all the DNA must be heated up prior to hybridization.
The Na+/K+ pump creates a ____ charge inside the cell and a ____ charge outside the cell
a. negative; negative b. positive; negative c. positive; positive d. negative; positive e. neutral; positive
What do structures like breakwaters and jetties inhibit?
a. Geographic distributions b. Species diversity c. Sediment transport d. Wetlands
There are not many species of fish living deep in the oceans, but the deep-sea fish occasionally pulled up by fisherman have been bizarre creatures, such as the deep-sea anglerfish with its giant fangs and bioluminescent lure. Why have these fascinating deep-sea fish never been shown live on exhibit in an aquarium?
A. They might frighten visitors. B. They are adapted to cold temperatures and total darkness. C. Their diet is too specialized. D. They are adapted for high pressure, and will die at low pressure.