What is absorption and assimilation?
Absorption is the release of digested food into the blood stream. Assimilation is the use of digested food in the organisms cells. Egestion is the removal of indigestible waste materials from the body.
What is assimilation in geology?
Assimilation is the process whereby solid or fluid foreign material is incorporated into magma. The term implies no specific mechanism and the process depends on many factors, including temperature, cooling rate of the magma, gas pressure, and the composition of the material being assimilated.
Where does nitrogen assimilation occur?
Nitrogen assimilation and recycling in young leaves mainly takes place within the chloroplast where nitrite reduction occurs and ammonium is assimilated by the GS/GOGAT cycle involving chloroplastic GS2 and Fd-GOGAT (Fig.
How do plants use nitrates?
Plants use nitrates as a supply of nitrogen, which is needed to make proteins for healthy growth. Plants absorb nitrates in water through their roots. Nitrates are present in high levels in plant fertilisers. This reduces the plant’s ability to photosynthesise and grow properly, which reduces the farmers’ crop yield .
Which enzyme is responsible for nitrate assimilation in plant?
In photosynthetic eukaryotes, nitrate assimilation is performed by two transport and two reduction steps: First, nitrate is transported into the cell, then a cytosolic Nitrate Reductase (NR) catalyzes nitrate reduction to nitrite, which subsequently is transported into the chloroplast, where the enzyme Nitrite …
Do plants use ammonia or nitrate?
Plants absorb ammonium and nitrate during the assimilation process, after which they are converted into nitrogen-containing organic molecules, such as amino acids and DNA. Animals cannot absorb nitrates directly.
What is the function of nitrate reductase?
Abstract Nitrate reductase (NR; EC 1.6. 6.1-3) catalyzes NAD(P)H reduction of nitrate to nitrite. NR serves plants, algae, and fungi as a central point for integration of metabolism by governing flux of reduced nitrogen by several regulatory mechanisms.