In 2005, a strain of extremely drug-resistant bacteria was isolated from a man in New York City. Public health officials braced themselves for many more cases, but they never appeared. What is the most likely explanation?
A) The strain must have reverted back to a sensitive strain in order to keep infecting more people.
B) The strain may have been less fit in other ways and thus not successful in the population.
C) The strain must have become extinct.
D) The strain must have been dormant and was waiting for the right conditions to reappear.
B
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Which one of the following is not an ecosystem service?
A. maintaining the quality of water supplies B. habitat restoration C. preventing soil erosion D. absorbing pollutants E. moderating climate
If an infant is being fed only its mother’s breast milk and if the woman has not experienced her first postpartum menses, then breastfeeding provides _______ protection from pregnancy in the first 6 months following a birth.
If an infant is being fed only its mother’s breast milk and if the woman has not experienced her first postpartum menses, then breastfeeding provides _______ protection from pregnancy in the first 6 months following a birth. [A] 78-85% [B] 70-78% [C] 70% [D] > 98% [E] 85-92% [F] 92-98%
Why do heavy consumers of alcohol gain weight?
a. Alcohol contains an excessive amount of calories. b. Ethanol is converted directly to fat molecules. c. Oxygen is diverted from breaking down fatty acids to break down ethanol. d. Ethanol inhibits the action of peroxisomes which work to break down fatty acids. e. The hydroxyl group on ethanol is transferred to fatty acids causing them to be stored as fat.
Which area is best known for its large effect of hydroperiod?
A) bottomlands B) prairie potholes C) fens D) bogs