Which among the following represents amidation during nitrogen...

Amidation is the process in which an amino acid reacts with an ammonium ion to form an amide. This process requires energy in the form of ATP.

In plants, the hydroxyl part of the acid group of an amino acid is replaced by another amino radical ($ext{NH}_2^-$). For example, glutamic acid reacts with $ext{NH}_4^+$ in the presence of ATP to form glutamine.

The reaction is:
Glutamic acid $+ ext{NH}_4^++$ ATP → Glutamine $+$ ADP $+$ Pi

The first option represents reductive amination.
The second option represents transamination.
The fourth option represents nitrification.

Answer: Glutamic acid $+\text{NH}_4+$ ATP $\rightarrow\alpha$-glutamine $+$ ADP