Question

Membrane bound Krebs cycle enzyme is

• A. Fumarase
• B. Cis-aconitase
• C. Succinic dehydrogenase
• D. Malate dehydrogenase

Answer 1

Answer: (C)

Succinic dehydrogenase

• The membrane-bound Krebs cycle enzyme is Succinic dehydrogenase.
  
• Succinate dehydrogenase (succinate-coenzyme Q reductase) is also known as Complex II is an enzyme complex embedded in the inner mitochondrial membrane.
• It participates in both the citric acid cycle (Krebs cycle) and the electron transport chain.
  
• It catalyses the conversion of succinate to fumarate in the Krebs cycle (dehydrogenation).
  
• So, the correct answer is 'Succinic dehydrogenase'.