Most rainfall returns water directly to ____
a. lakes
b. rivers
c. groundwater
d. oceans
e. plants
ANSWER: d
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Which of the following statements about emerging viruses is false?
A. Emerging viruses are able to "jump" from one species to another. B. Hantavirus, which causes a hemorrhagic-type fever, originates in deer mice. C. Ebola is an emerging virus of unknown origins that can have a mortality rate in excess of 50%. D. The emerging virus SARS is a coronavirus. E. The stable genome of the SARS virus makes it an unlikely candidate for vaccine development.
Summarize the results of one of the first investigations of the genetics of skin colorWhat will be an ideal response?
In north-central Florida, the cars, homes, streets, and ponds are covered with an impressive coating of bright yellow dust every spring. Upon closer, microscopic examination, the yellow "dust" turns out to be pollen grains
This area of Florida has pine trees, showy daytime-flowering plants, and often-unnoticed nighttime-flowering plants, with sweet-scented flowers, releasing pollen at the same time of year. Based on this information, which group of plants do you think is responsible for the yellow pollen? Why? A) The pines are responsible, because conifers are pollinated by wind and must produce enormous amounts of pollen in order to ensure that some of it reaches the female cones. B) The nighttime-flowering plants are responsible. Because they spend energy producing sweet-scented flowers that attract bat and moth pollinators, nighttime-flowering plants need to produce lots of pollen for the bats and moths to eat. C) The daytime-flowering plants are responsible. Because they spend energy producing showy flowers that attract animal pollinators, daytime-flowering plants need to produce lots of pollen for the animals to eat.
Cell extension involves
A. water leaving the central vacuole. B. expansion of cellulose microfibrils. C. loss of water. D. enzymes that produce polysaccharides. E. low acidic condition.