Question

Which of the following statements regarding mitochondria is incorrect ?

• A. Mitochondrial matrix contains single circular DNA molecule and ribosomes
• B. Outer membrane is permeable to monomers of carbohydrates, fats and proteins
• C. Enzymes of electron transport are embedded in outer membrane
• D. Inner membrane is convoluted with infoldings

Answer 1

The correct option is C Enzymes of electron transport are embedded in outer membrane

The electron transport system (ETS) is present in the inner mitochondrial matrix and hence its enzymes are also present there.
The matrix possesses single circular DNA molecules, a few RNA molecules, ribosomes (70S) and other components required for protein synthesis.
The outer mitochondrial membrane is permeable to small molecules such as monomers of carbohydrates, fats and proteins, through protein channels calles porins.
The inner membrane of the mitochondria forms infoldings called cristae towards the matrix which increases the surface area for maximum production of ATP.