Which of the following reactions is involved in the activation of phosphatidylinositol secondary messengers?
A) dephosphorylation
B) phosphorylation
C) reduction
D) oxidation
B
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Carbon dioxide levels in the atmosphere are rising due to the burning of fossil fuels. How might this increased level of carbon dioxide affect rates of weathering?
In what way is color an indicator of soil drainage?
A) Well-drained soils tend to be well aerated and red in color. B) Poorly drained soils tend to be well oxidized and red in color. C) Moderately drained soils tend to be green in color. D) Colors of soils are more reflective of organic matter than of drainage.
Why is the sea otter considered a keystone species in areas of the Pacific Ocean?
A) If sea otter populations were to crash, kelp forests could disappear because of overgrazing by sea urchins that would otherwise be controlled by the sea otters. B) Sea otters eat barnacles and mussels, and if sea otter populations were to crash, barnacles and mussel populations in tide pools would expand, causing a decrease in biodiversity in those areas. C) If sea otter populations were to crash, sea urchins would be unable to survive because kelp forests would become too dense. D) Sea otters were introduced to control kelp and other invasive plants, and without them, the plants would grow too thick to support crab and lobster populations in the area.
Figure 24.5
Why is the National Environmental Policy Act (NEPA), such an important law?
What will be an ideal response?