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What is the role of the electron transport chain in ATP synthesis?

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Question: What is the role of the electron transport chain in ATP synthesis?

Options:

  1. Substrate-level phosphorylation
  2. Oxidative phosphorylation
  3. Fermentation
  4. Glycolysis

Correct Answer: Oxidative phosphorylation

Solution:

The electron transport chain is responsible for oxidative phosphorylation, which generates ATP using the energy from electrons.

What is the role of the electron transport chain in ATP synthesis?

Practice Questions

Q1
What is the role of the electron transport chain in ATP synthesis?
  1. Substrate-level phosphorylation
  2. Oxidative phosphorylation
  3. Fermentation
  4. Glycolysis

Questions & Step-by-Step Solutions

What is the role of the electron transport chain in ATP synthesis?
  • Step 1: Understand that the electron transport chain (ETC) is a series of proteins located in the inner membrane of mitochondria.
  • Step 2: Know that the ETC receives electrons from molecules like NADH and FADH2, which are produced during earlier stages of cellular respiration.
  • Step 3: Realize that as electrons move through the ETC, they release energy.
  • Step 4: This energy is used to pump protons (H+ ions) from the inside of the mitochondria to the outside, creating a proton gradient.
  • Step 5: Understand that the proton gradient creates potential energy, similar to water behind a dam.
  • Step 6: Know that protons flow back into the mitochondria through a protein called ATP synthase.
  • Step 7: As protons flow through ATP synthase, it spins and helps convert ADP and inorganic phosphate (Pi) into ATP.
  • Step 8: Finally, recognize that this process of generating ATP using the energy from electrons is called oxidative phosphorylation.
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