Describe the ways in which marine dead zones threaten human society.
What will be an ideal response?
In marine dead zones, many electrons are being passed through the ETS to generate energy. This is because excess nutrients and carbon from human activities will stimulate the growth (and thereby oxidative respiration) of aerobic microbes. As a result, many molecules of oxygen are consumed, and the water begins to become anoxic. This causes die off of many marine animals, including fish. In this process, ammonium from runoff can be converted to nitrate (ammonium oxidation). As oxygen levels decline, nitrous oxide also builds up in marine dead zones, because the nitrates from ammonium oxidation are used as an electron acceptor. There are many denitrifying bacteria in this zone, reducing nitrate to nitrite and N2O. Bacterial denitrification and ammonia oxidation in polluted ocean water may contribute to global warming, because N2O captures about 200 times more heat than CO2.
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In mice, the allele for black fur is dominant to the allele for brown fur. If a male heterozygous black mouse is crossed with a female brown mouse, what percentage of the F1 offspring do you predict will be homozygous? ( Enter the number only without the percent sign. For example, enter 100% as 100 and enter 12.5% as 12.5 )
What will be an ideal response? Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about crosses and genotype ratios? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Pure water has a water activity value of
A. 1.00. B. 0.80. C. 0.70. D. 0.90.
What type of signal often advertises the presence of an animal or group of animals?
a. chemical b. pheromone c. visual d. acoustical e. tactile
What benefit does running a fever provide to a sick person?
What will be an ideal response?