On occasion, a stressful factor such as disease, starvation, or drought kills a large proportion of the individuals in a
population, producing ____ that dramatically reduces the population size.
a. natural selection
b. artificial selection
c. a lethal mutation
d. a founder effect
e. a population bottleneck
ANSWER: e
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The United States is most likely to have a pyramid-shaped age structure because it has more older individuals than young ones.
a. In West Africa b. In Southeast Asia c. In Western Europe d. In the Middle East
A pinniped is observed as lacking external ears, and it appears to propel through the water using its hind flippers only. What kind of pinniped might this be?
a. Phocids b. Sirenia c. Eared seals d. Walruses
Eyes contain ____
A. chemoreceptors. B. mechanoreceptors. C. photoreceptors. D. nociceptors. E. thermoreceptors.
If you forgot the decolorization step while performing a Gram stain, which outcome would you expect?
A. Gram-positive bacteria would be unstained B. Gram-negative bacteria would stain purple C. Gram-positive bacteria would stain pink D. Gram-negative bacteria would be unstained