Provides clues to identify a new disease or adverse health effect, identifies the extent of the public health problem and obtains a description of the public health problem that can be easily communicated
a. analytical epidemiology
b. descriptive epidemiology
Ans: b. descriptive epidemiology
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Explain how, when improper base pairing escapes repair by the proofreading system, cells are able to detect and repair
mutations. What will be an ideal response?
Although the function of the flexible outer sheath in which the axial filaments of spirochetes lay is unknown, it is nonetheless essential (i.e., the bacteria will not survive if it is removed).
Answer the following statement true (T) or false (F)
Interphase is ____________
Fill in the blank(s) with the appropriate word(s).
Tinbergen observed that after gull nestlings hatch, the parents remove the eggshells from the nest. To understand why (ultimate causation), he painted chicken eggs to resemble gull eggs, which had camouflage coloration to allow them to be inconspicuous against the natural background. He distributed them throughout the area in which the gulls were nesting, placing broken eggshells with their prominent white interiors next to some of the eggs. As a control, he left other camouflaged eggs alone without eggshells. He then noted which eggs were found more easily by crows. Because the crows could use the white interior of a broken eggshell as a cue, they ate more of the camouflaged eggs that were near eggshells. Tinbergen concluded that eggshell-removal behavior is adaptive:
it reduces predation and thus increases the offspring's chances of survival.Rank these experiments from worst to best to study why gulls remove broken eggshells from their nests.____ Place broken eggshells near brown chicken eggs painted with dark brown spots, and record predation by crows.____ Place broken eggshells near real gull eggs, and record predation by crows.____ Place broken eggshells near brown chicken eggs, and record predation by undergraduate students acting as "predators."____ Place broken eggshells near brown chicken eggs painted with dark brown spots, and record predation by undergraduatestudents acting as "predators."____ Place broken eggshells near white chicken eggs, and record predation by undergraduate students acting as "predators." What will be an ideal response?