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Inside an active mitochondrion, most electrons follow which pathway ?
  • a)
    Glycolysis → NADH → Oxidative Phosphorylation → ATP → O2
  • b)
    Krebs’ cycle → FADH2 → ETS → ATP
  • c)
    ETS → Krebs’ cycle → ATP → O2
  • d)
    Krebs’ cycle → NADH + H+ → Electron transport chain → O2
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Inside an active mitochondrion, most electrons follow which pathway ?...
Answer:

Electron Flow in Mitochondria

The electron flow in mitochondria starts with the oxidation of glucose to pyruvate followed by the complete oxidation of pyruvate to CO2. During this process, electrons are extracted from glucose and stored in the form of NADH and FADH2.

Krebs’ Cycle

The Krebs’ cycle is a series of enzymatic reactions that take place in the mitochondrial matrix. During this cycle, the acetyl group from acetyl-CoA is oxidized to CO2, and the electron carriers NAD+ and FAD+ are reduced to NADH and FADH2, respectively.

Electron Transport Chain

Electron transport chain (ETC) is a series of electron carriers located in the inner mitochondrial membrane. The ETC is responsible for the transfer of electrons from NADH and FADH2 to oxygen, resulting in the production of ATP. During this process, the energy released by the transfer of electrons is used to pump protons across the inner mitochondrial membrane, creating an electrochemical gradient. The ATP synthase enzyme uses this gradient to produce ATP.

Electron Flow in Active Mitochondria

In an active mitochondrion, most electrons follow the pathway from the Krebs’ cycle to NADH to the electron transport chain, where they are eventually transferred to oxygen to produce ATP. Therefore, option D is the correct answer.

Conclusion

Electron flow in mitochondria is a complex process involving several enzymatic reactions and electron carriers. In an active mitochondrion, most electrons follow the pathway from the Krebs’ cycle to NADH to the electron transport chain, where they are eventually transferred to oxygen to produce ATP.
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Community Answer
Inside an active mitochondrion, most electrons follow which pathway ?...
Option d is correct option
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Inside an active mitochondrion, most electrons follow which pathway ?a)Glycolysis → NADH → Oxidative Phosphorylation → ATP → O2b)Krebs’ cycle → FADH2 → ETS → ATPc)ETS → Krebs’ cycle → ATP → O2d)Krebs’ cycle → NADH + H+ → Electron transport chain → O2Correct answer is option 'D'. Can you explain this answer?
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