Answered: Nitrogen fixation and nitrate…

Nitrogen fixation and nitrate assimilation are the only ways biological systems can incorporate nitrogen into organic molecules. True O False

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter19: Viruses, Bacteria, And Archaea

Section: Chapter Questions

Problem 9SA

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Concept explainers

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.

Question

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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Dissimilatory nitrate reduction carried out by bacteria can lead to loss of nitrogen as N, from the environment. A) O True B) O False
Nitrogen fixation is carried out by.
Fixing free nitrogen from the air means converting into ions that can be used by many types of organisms. O nitrite nitrate Can nitrate be utilized by all organisms? O nitronium O ammonium
Regarding nitrogen fixation, are the following statements True or False? a) Atmospheric nitrogen is reduced to the biologically useful form NH3 (or NH4 ). b) Nitrogen fixation in nature and in the lab requires a metal cofactor or catalyst. c) The availability of fixed nitrogen limits biological productivity. d) Ammonium from the atmosphere is fixed to more usable forms of nitrogen, such as nitrite (NO2–). e) Nitrogen fixation is energetically neutral, using a negligible amount of ATP. f) The enzyme nitrogenase, which takes part in nitrogen fixation, is inactivated by oxygen.
Which of the following is not correct about nitrogen fixation? Carried out only by few prokaryotic organisms termed diazotrophs It requires metabolic energy None of the above Enzyme that catalyzes the reduction of nitrogen is termed as nitrogenase complex
Fill in the blanks. In the Nitrogen cycle, into are responsible for converting denitrifying bacteria/ammonium and ammonia/atmospheric nitrogen O nitrifying bacteria/ammonium and ammonia/nitrites and nitrates nitrogen-fixing bacteria/ammonium and ammonia/atmospheric nitrogen Onitrogen-fixing bacteria/ammonium and ammonia/nitrites and nitrates
Figure 22.19 Which of the following statements about the nitrogen cycle is false? Nitrogen fixing bacteria exist on the root nodules of legumes and in the soil. Denitrifying bacteria convert nitrates (NO3 ) into nitrogen gas (N2). Ammonification is the process by which ammonium ion (NH4+) is released from decomposing organic compounds. Nitrification is the process by which nitrites (NO2-) are converted to ammonium ion (NH4+).
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 you are a farmer and want to increase plant growth without adding artificial fertilizers to your fields/crops, which microbial process(es) would you consider beneficial/useful? nitrogen reduction and denitrificaiton nitrogen fixation and nitrification O nitrogen oxidation followed by reduction O denitrification and re-nitrification
All of the following are ways microorganisms adapt to limited nutrients except: synthesize increased amount of enzymes for uptake and metabolism of limited nutrients form metabolically active highly resistant endospores synthesize enzymes needed to use a different nutrient acetic acid adjust the rate at which they metabolize nutrients
1. Nitrogen-fixing bacteria reduce ammonia to nitrogen gas. true or false
The process by which nitrogen gas is converted to a usable form is called nitrogen