Question

what occurs in the reaction called phosphorylation?
o the removal of an amino group
o the breakdown of atp to form adp
o addition of inorganic phosphate to an organic molecule
o complete oxidation of a glucose or fatty acid molecule

Explanation:

Phosphorylation is a biochemical process where an inorganic phosphate group ($\text{Pi}$) is added to an organic molecule. This can activate or modify the molecule's function. The removal of an amino - group is deamination, ATP breakdown to ADP releases energy but is not the general definition of phosphorylation, and complete oxidation of glucose or fatty - acid is part of cellular respiration but not phosphorylation.

Answer:

Addition of inorganic phosphate to an organic molecule