Electron affinity: The enthalpy change that results from adding an electron to a gaseous atom.

Electron affinity is becoming less negative (less exothermic) and less likely to gain an electron. 

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Ammonium uptake from the soil is carried by AMT/Rh family transporters

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Two types of symporters (NRT1 and NRT2) and one antiporter (CLC) are involved in nitrate transport in plants.

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#Section 2: General Biology

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Ammonium assimilation in roots

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Nitrate reductase

Homodimers, two identical subunits

Each subunit with 100kD

Each subunit contains 3 prosthetic groups:

FAD, heme, and molybdenum complexed to pterin (an organic molecule). 

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#Section 2: General Biology

The nitrate reductase dimer- Three binding domains