NEETBotanyRespiration in Plants
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): In the TCA cycle, the conversion of succinyl-CoA to succinic acid is an example of substrate-level phosphorylation. Reason (R): During this conversion, a molecule of GTP is synthesised directly without the involvement of the electron transport chain. In the light of the above statements, choose the
Options
- ABoth Assertion (A) and Reason (R) are false statements.
- BAssertion (A) is true but Reason (R) is false.
- CBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
- DBoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
Correct answer
D. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
Step-by-step solution
Assertion (A) is true: The conversion of succinyl-CoA to succinic acid in the TCA cycle involves the synthesis of a molecule of GTP (which can be coupled to ATP synthesis). This process is known as substrate-level phosphorylation. Reason (R) is also true and correctly explains the Assertion: Substrate-level phosphorylation is defined as the direct synthesis of ATP/GTP from ADP/GDP and an inorganic phosphate, driven by the energy released from the cleavage of a substrate, completely independent of the electron trans