How do assimilative and dissimilative metabolism of so+2- and coz differ? are the end products in these modes of metabolism?
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All microorganisms need sources of N, S, and C for growth. When an inorganic compound such as nitrate (NO–3), sulphate (SO2-4) or CO2 is reduced for use as a nutrient source, it is said to be ‘assimilated’ and the reduction process is called assimilative metabolism.
But when such inorganic compounds are used as electron acceptors for energy metabolism in anaerobic respiration, they are said to be ‘dissimilated”, and the reduction process is called dissimilative metabolism.
Assimilative and dissimilative metabolisms differ markedly from one another. In assimilative metabolism, only comparatively lesser amount of the compounds (NO–3 SO2-4or CO2) is reduced to fulfill the requirements for cell growth and reduced atoms are eventually converted to macromolecules that constitute the cell material.
In dissimilative metabolism, a comparatively large amount of electron acceptors (NO–3 SO2-4 or CO2-3, etc.) are reduced, and the reduced product is excreted by the organism into the environment as waste product.
Assimilative metabolism is carried out by many organisms (many bacteria, archaebacteria, fungi, algae, and higher plants), whereas only a restricted variety of organisms, primarily the prokaryotic microorganisms, carry out dissimilative metabolism.
But when such inorganic compounds are used as electron acceptors for energy metabolism in anaerobic respiration, they are said to be ‘dissimilated”, and the reduction process is called dissimilative metabolism.
Assimilative and dissimilative metabolisms differ markedly from one another. In assimilative metabolism, only comparatively lesser amount of the compounds (NO–3 SO2-4or CO2) is reduced to fulfill the requirements for cell growth and reduced atoms are eventually converted to macromolecules that constitute the cell material.
In dissimilative metabolism, a comparatively large amount of electron acceptors (NO–3 SO2-4 or CO2-3, etc.) are reduced, and the reduced product is excreted by the organism into the environment as waste product.
Assimilative metabolism is carried out by many organisms (many bacteria, archaebacteria, fungi, algae, and higher plants), whereas only a restricted variety of organisms, primarily the prokaryotic microorganisms, carry out dissimilative metabolism.
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