Question

The proteins present in the outer membrane of mitochondria are called as

• A. Lysosomes
• B. Porins
• C. Endosomes
• D. Plasmagel

Answer 1

The correct option is B Porins

Mitochondria possess double membranous covering i.e., inner and outer. The thickness of outer membrane ranges from 60 to 75 angstroms ($A{}^o$). It has a protein to phospholipid ratio similar to that of the eukaryotic plasma membrane. It contains large numbers of integral membrane proteins called as porins. These porins form channels that allow molecules of 5000 daltons or less in molecular weight to freely diffuse from one side of the membrane to the other.

Thus, the correct answer is option B.