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Question
In the electron transfer chain, during terminal oxidation, oxygen receives electrons from
In the electron transfer chain, during terminal oxidation, oxygen receives electrons from
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Solution
The correct option is C cyt-a3
The metabolic pathway through which the electron passes from one carrier to another and finally passed on to O2 resulting in the formation of H2O is called the electron transport system (ETS). It occurs in the inner mitochondrial membrane.
Electrons from NADH produced in the mitochondrial matrix during citric acid cycle are oxidised by an NADH dehydrogenase (complex I).
Electrons are then 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 citric acid cycle.
The reduced ubiquinone (ubiquinol) is then oxidised with the transfer of electrons to cytochrome c via cytochrome bc1 complex (complex III).
Cytochrome c is a small protein attached to the outer surface of the inner membrane and acts as a mobile carrier for transfer of electrons between complex III and IV.
Complex IV refers to cytochrome c oxidase complex containing cytochromes a and a3, and two copper centres.
The oxygen receives electrons from cyt-a3. The diagramatic representation is shown below:
The metabolic pathway through which the electron passes from one carrier to another and finally passed on to O2 resulting in the formation of H2O is called the electron transport system (ETS). It occurs in the inner mitochondrial membrane.
Electrons from NADH produced in the mitochondrial matrix during citric acid cycle are oxidised by an NADH dehydrogenase (complex I).
Electrons are then 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 citric acid cycle.
The reduced ubiquinone (ubiquinol) is then oxidised with the transfer of electrons to cytochrome c via cytochrome bc1 complex (complex III).
Cytochrome c is a small protein attached to the outer surface of the inner membrane and acts as a mobile carrier for transfer of electrons between complex III and IV.
Complex IV refers to cytochrome c oxidase complex containing cytochromes a and a3, and two copper centres.
The oxygen receives electrons from cyt-a3. The diagramatic representation is shown below:
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