Question

multiple choice question
what occurs in the reaction called phosphorylation?

the removal of an amino group

addition of inorganic phosphate to an organic molecule

complete oxidation of a glucose or fatty acid molecule

the breakdown of atp to form adp

Explanation:

• The first option is deamination (removal of amino group), not phosphorylation.
• Phosphorylation is defined as the addition of an inorganic phosphate ($P_i$) to an organic molecule.
• Complete oxidation of glucose/fatty acid is cellular respiration (like glycolysis, Krebs cycle, etc.), not phosphorylation.
• Breakdown of ATP to ADP is hydrolysis (ATP → ADP + $P_i$), which can be part of phosphorylation's reverse (dephosphorylation) or energy release, but phosphorylation is the addition, not breakdown.

Answer:

B. Addition of inorganic phosphate to an organic molecule