In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice as
Assertion: Conversion of 1,3 biphosphoglycerate (BPGA) to 3-phospho-glyceric acid (PGA) is an energy-yielding step.
Reason: This energy is trapped in the form of ATP.
If both assertion and reason are true but reason is not the correct explanation of assertion.
One of the two phosphates of 1, 3 biphosphoglycerate (BPGA) is linked by high energy bond. It can synthesise ATP and form 3-phosphoglycerate by phosphoglycerate kinase enzyme. This step of glycolysis is the enzymatic transfer of a phosphate group from 1,3-bisphosphoglycerate to ADP by phosphoglycerate kinase, forming ATP and 3-phosphoglycerate. The direct synthesis of ATP from metabolites is called substrate-level phosphorylation. This is a break-even point of glycolysis where 2ATPs have been consumed and two new ATP molecules have been produced.