____ patrol the blood and develop into phagocytic ____ that patrol tissues and interstitial fluid
a. Macrophages; neutrophils
b. Neutrophils; macrophages
c. Dendritic cells; macrophages
d. Monocytes; macrophages
e. Monocytes; dendritic cells
ANSWER: d
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We consider the crash of the groundfish populations off the coast of Cape Cod as an example of ecosystem collapse due to mankind's negligence. How might this forecast our future?
What will be an ideal response?
How do greenhouse gases cause climate warming?
A. Solar energy is absorbed by greenhouse gases in the upper atmosphere and re-emitted toward the earth's surface as heat, causing the climate to warm. B. Greenhouse gases block solar energy from entering the lower level of the atmosphere. C. Greenhouse gases prevent radiation of infrared energy back into space, trapping the heat near the earth's surface and causing the climate to warm. D. Infrared energy from space is absorbed by greenhouse gases in the upper atmosphere, which then re-emit the heat toward the surface of the earth, causing the climate to warm. E. Greenhouse gases absorb solar energy and re-emit it into space before it can reach the earth's surface.
If yeasts are grown under anaerobic conditions, pyruvate is converted first to ____ and then to ____
a. citrate; oxaloacetate b. acetaldehyde; lactate c. lactate; carbon dioxide d. acetaldehyde; ethyl alcohol e. acetyl coenzyme A; citrate
Gene flow contributes to allopatric speciation
a. true b. false