The Transfer of a Phosphate Group from Creatine Phosphate to ADP

Question

The transfer of a phosphate group from creatine phosphate to ADP is classified as:
A)second phosphorylation.
B)oxidative phosphorylation.
C)substrate-level phosphorylation.
D)first phosphorylation.

Accepted Answer

The transfer of a phosphate group from creatine phosphate to ADP is considered substrate-level phosphorylation, as the phosphate group is transferred directly from the substrate (creatine phosphate) to ADP to form ATP. This is different from oxidative phosphorylation, which involves the transfer of phosphate groups to ADP through the electron transport chain, and from the first phosphorylation, which refers to the initial addition of a phosphate group to glucose during glycolysis. The term "second phosphorylation" is not a commonly used classification in cellular respiration.