Question

Assertion : This conversion of $1$, $3$-bishosphoglycerate $(BPGA)$ to $3$-phosphoglyceric acid $(PGA)$ is an energy yielding step.
Reason : This energy is trapped by the formation of $ATP$.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (B)

The conversion of $1$, $3$ - bisphosphoglycerate $(BPGA)$ to $3$ phosphoglyceric acid $(PGA)$ is an energy yielding step. One of the two phosphates of bisphosphoglycerate is linked by high energy bond. It can synthesise $ATP$ and form $3$-phosphoglycerate. The enzyme is phosphoglycerate kinase. The direct synthesis of $ATP$ from metabolites is called substrate level phosphorylation.