Question

Electron transport chain mechanism for generation of ATP is carried out in

• A. Outer membrane of Endoplasmic reticulum
• B. Mitochondrial Matrix
• C. Mitochondrial folded inner membrane cristae
• D. In Golgi bodies

Hint:

• Aerobic Respiration Stages in Eukaryotes:
  • Glycolysis: Cytoplasm
  • Pyruvate Oxidation & Krebs Cycle: Mitochondrial matrix
  • Electron Transport Chain & Oxidative Phosphorylation: Inner mitochondrial membrane (cristae)
• The cristae increase surface area for the ETC components and ATP synthase.

Answer 1

The Correct Option is C

The electron transport chain (ETC) is a series of protein complexes located in the inner mitochondrial membrane, specifically on the cristae of the mitochondria. These cristae are inward folds that increase the surface area available for energy-producing reactions.

The ETC is crucial for oxidative phosphorylation, a process that generates ATP. Here's why the electron transport chain mechanism for ATP production occurs in the mitochondrial folded inner membrane cristae:

• Location Specificity: The inner membrane of the mitochondria contains the essential components of the electron transport chain. The proteins and complexes involved are embedded in this membrane and are responsible for the transfer and movement of electrons.
• Increased Surface Area: The cristae's folded structure increases the surface area, allowing more space for electron transport chain proteins and subsequently more sites for efficient ATP production.
• Proximity to ATP Synthase: ATP synthase is also a transmembrane protein located in the inner membrane. The proton gradient created by the electron transport chain drives ATP synthesis as protons flow back through ATP synthase, converting ADP to ATP.

Therefore, the correct answer is Mitochondrial folded inner membrane cristae.