Enzymes that catalyze the dephosphorylation of this molecule are named ATPases. What molecule is the substrate?

Enzymes that catalyze the dephosphorylation of this molecule are named ATPases. What molecule is the substrate?

• A. Adenosine triphosphate
• B. Nicotinamide adenine dinucleotide
• C. Adenosine diphosphate
• D. Glucose

Answer: (A)

ATPases are enzymes that hydrolyze ATP, removing a phosphate group to release energy for cellular work. In their action, the molecule being dephosphorylated is ATP (adenosine triphosphate), which is converted to ADP and inorganic phosphate. That’s why ATP is the substrate here. NAD and glucose are involved in other pathways and processes, not the dephosphorylation step performed by ATPases, and ADP is the product of ATP hydrolysis, not the substrate.

ATPases are enzymes that hydrolyze ATP, removing a phosphate group to release energy for cellular work. In their action, the molecule being dephosphorylated is ATP (adenosine triphosphate), which is converted to ADP and inorganic phosphate. That’s why ATP is the substrate here. NAD and glucose are involved in other pathways and processes, not the dephosphorylation step performed by ATPases, and ADP is the product of ATP hydrolysis, not the substrate.