Question

What is the direct source of the energy used to attach a phosphate group to adenosine diphosphate (ADP)?

choices

a food molecule
ATP
sunlight
a protein

Answer 1

Answer:
Phosphorylation.

Step-by-step explanation:
It's a chemical energy to be transferred in living cells. During cellular respiration, the energy released by the gradual breakdown of food molecules is used to attach a third phosphate to ADP to this changes the ATP molecule to molecule of ATP.