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Which of the following statement about the electron transport system (ETS) is correct? Statement 1: The metabolic pathway through which the electron passes from one carrier to another. Statement 2: It is present in the inner mitochondrial membrane. 

Which of the following statement about the electron transport system (ETS) is correct? Statement 1: The metabolic pathway through which the electron passes from one carrier to another. Statement 2: It is present in the inner mitochondrial membrane.  Correct Answer Both are correct

The correct answer is 3 i.e. Both are correct.

Explanation: 

  • The metabolic pathway through which the electron passes from one carrier to another is called the electron transport system (ETS) and it is present in the inner mitochondrial membrane.
  • Electrons from NADH produced in the mitochondrial matrix during the citric acid cycle are oxidized by an NADH dehydrogenase (complex I), and electrons are then transferred to ubiquinone located within the inner membrane.
  • Ubiquinone also receives reducing equivalents via FADH2 (complex II) that is generated during the oxidation of succinate in the citric acid cycle.
  • The reduced ubiquinone (ubiquinol) is then oxidized with the transfer of electrons to cytochrome c via cytochrome bc 1 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 the transfer of electrons between complex III and IV.
  • Complex IV refers to cytochrome c oxidase complex containing cytochromes a and a3, and two copper centers.

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