Humans have become so dependent on fossil fuels that despite an increasing body of evidence that indicates burning these fuels is destroying aspects of the environment, little change in the sources of fuels has occurred
What types of alternative fuels can be used to reduce negative impacts on the environment?
There are many alternative fuel sources that could be utilized, although the technologies for maximizing use still need to be further developed. Hydroelectric power and solar power both offer a tremendous source of energy. They also have the added benefit of being renewable resources that have very few negative consequences. Other fuels being explored include nuclear energy and biomass fuels. Public fears have slowed development of nuclear energy because of incidents at Three Mile Island in the United States and Chernobyl in the Ukraine.
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Alternation of heteromorphic generations
(a) is found only in the bryophytes. (b) is common to all land plants. (c) is typical of most green algae. (d) occurs in the liverworts but not mosses.
Which one of the following is not a major plant hormone?
A. auxins B. brassino-steroids C. ethylene D. cytokinins E. ethanol
An example of local control over breathing is ____
a. automated lung ventilation and perfusion adjustments to changing O2 levels in the blood b. the aortic bodies signaling an increase in breathing rate when blood pH is acidic c. refinement by the interneuron groups of the pons of contractions involved in inhalation and exhalation d. the carotid bodies signaling an increase in breathing rate when O2 levels are low e. the ventral group of interneurons signaling an increase in breathing rate and depth during exercise
Insulin lowers glucose concentration in the blood, by binding to receptors on liver cells, adipose tissue, and skeletal muscle cells. What type of receptor does insulin bind to?
1.adrenergic receptor 2.G-protein–coupled receptor 3.internal receptor 4.receptor tyrosine kinase