Biology · CELL THE UNIT OF LIFE

Which structural and chemical feature correctly distinguishes the inner mitochondrial membrane and matrix from the outer mitochondrial membrane?

1. A
   The outer membrane forms deep tubular infoldings called cristae, whereas the inner membrane forms a smooth continuous limiting boundary.
2. B
   The matrix lacks any genetic material and depends exclusively on nuclear 80S ribosomes for protein synthesis.
3. C
   The inner membrane forms infoldings called cristae towards the matrix to increase surface area, and the matrix possesses a single circular DNA molecule, 70S ribosomes, and RNA.
4. D
   The inner membrane contains only lipid pigments while the outer membrane possesses enzymes specifically meant for the Krebs cycle.