Lyme disease is caused by a bacterium found in the bloodstream of small woodland rodents such as mice or chipmunks and also found occasionally in deer. Yet humans get this disease without coming into direct contact with either rodents or deer. Explain
the concept of a biological vector, and discuss how humans contract Lyme disease.
What will be an ideal response?
Although the bacterium that causes Lyme disease is found in animals, it can be transmitted to humans even if the animal is not present. Small external parasites called ticks bite the animal host and pick up the microbes from the bloodstream. Then they may jump on a human who is passing by and bite the person. This bite transmits the bacterium from the tick to the human.
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The default state for the lac operon is off, while the default state for the trp operon is on. Explain this
contradiction and the mechanism of control via the repressor proteins.
What will be an ideal response?The upper layer of warm, less dense water is referred to as the
A) thermocline. B) hypolimnion. C) epilimnion. D) benthic zone.
Modern humans are
A. hominoids. B. primates. C. anthropoids. D. hominids. E. All of the choices apply to humans.
The Irish potato famine in the 1840s was caused in large part by a proliferation of a(n)
A. Oomycote. B. Chlorophyte. C. Fungus. D. Dinoflagellate. E. Paramecia.