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In the electron transport chain during terminal oxidation, the cytochrome, which donates electrons to O2 is ?
  • a)
    Cytochrome-b
  • b)
    Cyto-C
  • c)
    Cyto-a3
  • d)
    Cyto.-f
Correct answer is option 'C'. Can you explain this answer?
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In the electron transport chain during terminal oxidation, the cytochr...
Refer ncert text pic of respiration in higher plants..so option c is crt
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In the electron transport chain during terminal oxidation, the cytochr...
Terminal oxidation in the electron transport chain

In the electron transport chain, terminal oxidation is the final step that occurs in the inner mitochondrial membrane. It involves the transfer of electrons from reduced coenzymes (NADH and FADH2) to molecular oxygen (O2), resulting in the production of water (H2O). This process is essential for generating the majority of ATP in aerobic organisms.

The role of cytochrome in terminal oxidation

During terminal oxidation, electrons are passed through a series of protein complexes called cytochromes. Cytochromes are heme-containing proteins that function as electron carriers. They have a crucial role in shuttling electrons between different complexes in the electron transport chain.

Among the cytochromes involved in the electron transport chain, cytochrome-a3 is the specific cytochrome that donates electrons directly to oxygen (O2). It is a part of complex IV, also known as cytochrome c oxidase. Complex IV is the final electron transport chain complex and is responsible for the reduction of molecular oxygen to water.

Electron transfer to O2

When cytochrome-a3 donates electrons to oxygen, it undergoes a series of redox reactions. It first accepts electrons from cytochrome c and transfers them to a copper center (CuB) within the complex. From there, the electrons are transferred to a heme group (heme a3) within cytochrome-a3. Finally, these electrons are transferred to the bound oxygen molecule, leading to the formation of water.

The process of electron transfer to oxygen is coupled with the pumping of protons across the inner mitochondrial membrane, creating a proton gradient. This proton gradient is essential for the synthesis of ATP by ATP synthase, which harnesses the energy stored in the gradient.

Conclusion

In conclusion, during terminal oxidation in the electron transport chain, the cytochrome that donates electrons directly to oxygen is cytochrome-a3. This cytochrome is a part of complex IV and is responsible for the reduction of molecular oxygen to water. Understanding the role of cytochromes in electron transport is crucial for the efficient production of ATP in aerobic organisms.
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In the electron transport chain during terminal oxidation, the cytochrome, which donates electrons to O2 is ?a)Cytochrome-bb)Cyto-Cc)Cyto-a3d)Cyto.-fCorrect answer is option 'C'. Can you explain this answer?
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