Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 15, Problem 8RQ
Summary Introduction
To review:
The different environmental sources of nitrogen and the utilization of different sources by nitrogen.
Introduction:
Nitrogen is a vital limiting factor in plant growth and development. It is a major component of chlorophyll that is the most significant pigment required for photosynthesis. Nitrogen is also evident in the formation of amino acids that are monomers of protein. Although it is one of the most abundant elements, plants can only use reduced forms of this element.
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Why is nitrogen fixation so energetically costly?
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.
Organic forms of nitrogen are converted to inorganic forms via what process?
a)photosynthesis
b)consumption
c)nitrogen fixation
d)decomposition
Chapter 15 Solutions
Microbiology: An Evolving Science (Fourth Edition)
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- Why is nitrogen a limiting nutrient for so many organisms, and what is it used for? (consider the four types of organic molecules)arrow_forwardWhat is nitrogen fixationarrow_forwardBiofuels offer an attractive alternative to fuel, but there are concerns about the resources and logistics of producing mass amounts of corn. Which organism is being considered as an alternative source of biofuel? A) cyanobacteria B) Escherichia coli C) yeast D) algaearrow_forward
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