NEET
- Exam
- NEET
- Subject
- Botany
- Chapter
- Respiration in Plants
NEET · Botany · Respiration in Plants
What type of phosphorylation occurs during the conversion of...
What type of phosphorylation occurs during the conversion of succinyl-CoA to succinic acid?
Options
- AOxidative phosphorylation
- BSubstrate-level phosphorylation
- CPhotophosphorylation
- DChemiosmotic phosphorylation
Correct answer
B. Substrate-level phosphorylation
Step-by-step solution
During the conversion of succinyl-CoA to succinic acid a molecule of GTP is synthesised. This is a substrate level phosphorylation. In a coupled reaction GTP is converted to GDP with the simultaneous synthesis of ATP from ADP. Also there are three points in the cycle where NAD+ is reduced to NADH + H⁺ and one point where FAD+ is reduced to FADH2 . The continued oxidation of acetyl CoA via the TCA cycle requires the continued replenishment of oxaloacetic acid, the first member of the cycle. In addition it also requires regeneration of NAD+ and FAD+ from NADH and FADH2 respectively.