Question

In which part of the mitochondria does the Krebs cycle take place?

• A. Inner mitochondrial membrane
• B. Outer mitochondrial membrane
• C. Cristae
• D. Mitochondrial matrix
• E. Inter-membrane space

Answer 1

Answer: (D)

Mitochondrial matrix

The Krebs cycle is also known as citric acid cycle or tricarboxylic acid (TCA) cycle. This cycle involves series of reactions in which the energy is released by the break down of the molecules like carbohydrates, proteins and fats. The energy is released in the form of ATP. The reaction of this cycle is carried out in the mitochondrial matrix. The enzymes for this pathway are present in the matrix of the mitochondria.

Thus, the correct answer is option D.