Which molecule can be used to quickly regenerate ATP by a direct phosphorylation reaction?
A) creatine phosphate
B) glycogen
C) lactic acid
D) pyruvate

Question

Quizplus · Accepted Answer

Creatine phosphate can be rapidly hydrolyzed by the enzyme creatine kinase to donate a phosphate group to ADP, forming ATP. This allows for quick energy regeneration during short bursts of intense activity, such as in weightlifting or sprinting. Glycogen and pyruvate are both energy sources for ATP production through cellular respiration, but they do not directly contribute a phosphate group for ATP regeneration. Lactic acid is a byproduct of anaerobic metabolism and can accumulate in muscles during strenuous exercise, leading to fatigue, but it is not directly involved in ATP regeneration.

Which Molecule Can Be Used to Quickly Regenerate ATP by a Direct