The amino acid which plays a central role in nitrogen metabolism is/are:

Which is the appropriate sequence for the amino acid synthesis?

The first enzyme that reduces nitrates into nitrites in plants is

The removal of an amino group from an amino acid to transform it into a keto acid is known as:

The processes of nitrification and nitrate assimilation are:

Identify the chemical reaction and the enzyme involved in the following process:
$\alpha$-Ketoglutaric acid + $NH_4^+ + NADPH \rightarrow$ Glutamate + $H_2O + NADP$