NTA Abhyas NEET2020BotanyRespiration in PlantsPractice
Which of the following is correct, for the mitochondrial ETS?
Options
- ANumber of ATP molecules synthesised does not depend on nature of electron donor
- BUbiquinone receives reducing equivalents via FADH 2 also.
- CCytochrome c is a large protein, attached to outer surface of inner mitochondrial membrane.
- DComplex IV has cyt a and cyt a 3, but no copper centres.
Correct answer
B. Ubiquinone receives reducing equivalents via FADH 2 also.
Step-by-step solution
Electron transport system (ETS) is present in the inner membrane of mitochondrial. Electrons from NADH produced in the mitochondrial matrix during TCA cycle are oxidised by an NADH dehydrogenase (complex I), and are transferred to ubiquinone located within the inner membrane. Ubiquinone also receives reducing equivalents via FADH2 (complex II) that is generated during oxidation of succinate in the TCA cycle. The reduced ubiquinone (ubiquinol) is then oxidised with the transfer of electrons to cytochrome c via cytoc