The common childhood illness called "hand-foot-and-mouth disease" because it causes lesions in these areas is caused by
A) an echoviruse.
B) a rhinoviruse.
C) a strain of coxsackie A virus.
D) a strain of coxsackie B virus.
E) the rubella virus.
C
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The increase in cytosolic calcium within the egg during fertilization initiates
A. the slow block to polyspermy. B. the cortical reaction. C. signaling for the first cell division. D. the release of enzymes by the egg. E. All of the choices are correct.
In great tits, increased warming has resulted in
A) earlier egg laying. B) earlier migration schedules. C) greater mortality. D) larger body size.
Why do mammals adapted to dry climates tend to have considerably more long-looped nephrons than those adapted to wet climates?
A) So that their blood pressure does not drop to dangerously low levels during periods of drought B) So that a lower concentration of salt can be produced in the interstitial fluid of the kidney medulla, causing less water to be reabsorbed into the capillaries C) So that the wastes can be excreted as uric acid instead of urine D) So that the excess urea they produce as a result of dehydration can be properly filtered by the nephrons and excreted E) So that a higher concentration of salt can be produced in the interstitial fluid of the kidney medulla, causing more water to be reabsorbed into the capillaries
A population in which death rates are higher than birth rates, and the prereproductive group is smaller than the reproductive group, is best represented by an age structure diagram with a(n) ________-shape.
A. pyramid B. urn C. S D. bell E. J