Question

Outer mitochondrial membrane resembles bacterial membrane and outer chloroplast membrane in having

• A. Selective permeability
• B. Single ion channels
• C. Porins
• D. All of the above

Answer 1

The correct option is C Porins

• Outer mitochondrial membrane resembles bacterial membrane and outer chloroplast membrane in having porins.
  
• The outer mitochondria membrane is a phospholipid bilayer embedded with integral proteins.
  
• This layer contains porins that allow the movement of molecules across them (10,000 Daltons or less) similar to a bacterial membrane or the membrane of the chloroplast.
• It is permeable to water, ions and few proteins to move freely into the inner mitochondrial space.
• So, the correct answer is 'Porins'.