Which molecule is produced alongside ATP when creatine phosphate donates a phosphate to ADP?

Which molecule is produced alongside ATP when creatine phosphate donates a phosphate to ADP?

• A. ADP
• B. Lactate
• C. Creatine
• D. Glucose

Answer: (C)

The main idea here is the phosphagen system in muscle energy. When creatine phosphate donates its phosphate to ADP, a molecule of ATP is formed and the leftover byproduct is creatine. The reaction, catalyzed by creatine kinase, is phosphocreatine + ADP → ATP + creatine. This provides a rapid, short-lived surge of ATP during the first seconds of intense activity, until other pathways take over. Other options don’t fit because lactate comes from anaerobic glycolysis, ADP is a substrate in this step, and glucose is a carbohydrate used in glycolysis, not produced by this transfer.

The main idea here is the phosphagen system in muscle energy. When creatine phosphate donates its phosphate to ADP, a molecule of ATP is formed and the leftover byproduct is creatine. The reaction, catalyzed by creatine kinase, is phosphocreatine + ADP → ATP + creatine. This provides a rapid, short-lived surge of ATP during the first seconds of intense activity, until other pathways take over. Other options don’t fit because lactate comes from anaerobic glycolysis, ADP is a substrate in this step, and glucose is a carbohydrate used in glycolysis, not produced by this transfer.