AP BIOLOGY

Detailed explanation-1: -ATP breakdown into ADP and Pi is called hydrolysis because it consumes a water molecule (hydro-, meaning “water”, and lysis, meaning “separation”). Figure 7.6. 1: Adenosine Triphosphate (ATP): ATP is the primary energy currency of the cell.

Detailed explanation-2: -When one phosphate group is removed by breaking a phosphoanhydride bond in a process called hydrolysis, energy is released, and ATP is converted to adenosine diphosphate (ADP). Likewise, energy is also released when a phosphate is removed from ADP to form adenosine monophosphate (AMP).

Detailed explanation-3: -Think of it as the “energy currency” of the cell. If a cell needs to spend energy to accomplish a task, the ATP molecule splits off one of its three phosphates, becoming ADP (Adenosine di-phosphate) + phosphate. The energy holding that phosphate molecule is now released and available to do work for the cell.

Detailed explanation-4: -Mitochondrial adenylate kinase 2 (AK2) catalyzes the reaction of two molecules of ADP to form AMP and ATP (Hamade et al. 1982). Localization of AK2 specifically to the mitochondrial intermembrane space is inferred from studies of the homologous rat enzyme (Criss 1970).