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If earth is filled in di-nitrogen gas, why is the productivity of so many ecosystems limited b availability of nitrogen

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter20: Ecosystems And The Biosphere

Section: Chapter Questions

Problem 7RQ: The process whereby oxygen is depleted by the growth of microorganisms due to excess nutrients in...

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Metabolic pathways

Metabolism is defined as the group of life-supporting, enzyme-mediated chemical reactions in organisms. A metabolic pathway is a set of these chemical reactions that involve anabolism (synthesis of complex biomolecules) and catabolism (breakdown of biomolecules into small molecules) that occur inside a cell. Metabolites are the reacting substances, products, and intermediate substances of an enzymatic process that are altered by a series of chemical events catalyzed by enzymes.

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Figure 46.17 Which of the following statements about the nitrogen cycle is false? Ammonification converts organic nitrogenous matter from living organisms into ammonium (NH4+). Denitrification by bacteria converts nitrates (NO3-) to nitrogen gas (N2). Nitrification by bacteria converts nitrates (NO3) to nitrites (NO2-). Nitrogen fixing bacteria convert nitrogen gas (N2) into organic compounds.
If Earth is filled muchly of di-nitrogen gas, why is the productivity of se many ecosystems limited by availability of nitrogen?
Which nitrogen flux is incorrectly described? O nitrification is the conversion of ammonium to nitrates nitrogen mineralization is the conversion of organic nitrogen to inorganic nitrogen nitrogen immo bilization is the conversion of ammonium to metamorphic rock O denitrification is the conversion of nitrate to nitrogen gas O nitrogen fixation is the conversion of nitrogen gas to bioavailable forms of nitrogen
Nitrogen is often the limiting nutrient (that is, the nutrient in shortest supply relative to demand) across a wide range of ecosystems. This is because: a. nitrogen compounds like ammonia are rapidly stored in rocks and sediments. O b. most nitrogen is in the form of N2, which only specialized bacteria can fix into accessible forms. О с. there is very little nitrogen on Earth, compared with other nutrients. O d. decomposers don't return nitrogen to a usable form.
Why are bacteria required in the nitrogen cycle
Nitrogen fixation and nitrate assimilation are the only ways biological systems can incorporate nitrogen into organic molecules. O True O False
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Matter is continually recycled between abiotic and biotic components of Earth's ecosystem in biogeochemical cycles. the various cycles differ from one another in several key aspects of their storage, conversion and modes of transport. A. Describe the critical processes by which nitrogen is cycled through the biotic and abiotic components of earth’s atmosphere and identify the primary storage sink for nitrogen
An estimated 1000 kg of plant plankton are needed to produce 100 kg of animal plankton. The animal plankton is in turned consumed by 10 kg of fish, the amount needed by a person to gain 1 kg of body mass. i) explain why the amount of biomass declines at each successive trophic level.
Why are nitrogen-containing molecules limited in the biosphere? Give two reasons.