Question

Both the membranes of mitochondria are

• A. Structurally different but functionally similar.
• B. Structurally as well as functionally different.
• C. Structurally similar but functionally different.
• D. None of these

Answer 1

Answer: (B)

Structurally as well as functionally different.

The outer membrane of mitochondria protein-to-phospholipid ratio in 1:1 ratio and contains integral membrane proteins called porins. Whereas the inner membrane protein-to-phospholipid ratio of 3:1 and contains unusual phospholipid, cardiolipin. Outer membrane imports proproteins and inner membrane also imports proteins but involved in ATP synthesis which outer membrane does not perform.

So the correct answer is 'Structurally as well as functionally different.'