Which of the following statements regarding mitochondria is incorrect?

Which of the following statements regarding mitochondria is incorrect?
  1. Outer membrane is permeable to monomers of carbohydrates, fats and proteins.
  2. Enzymes of electron transport are embedded in outer membrane.
  3. Inner membrane is convoluted with infoldings.
  4. Mitochondria matrix contains single circular DNA molecule and ribosomes.

Solution

The thickness of the outer mitochondrial membrane, which encloses the entire organelle, is 60 to 75 angstroms Å . It has a protein-to-phospholipid ratio similar to that of the cell membrane (about 1:1 by weight). It consists of a large number of porins, an integral membrane proteins. The pore-forming voltage-dependent anion channel is the major trafficking protein.
The inner membrane of mitochondria has convoluted foldings.
The inner membrane encloses the matrix. It consists of 2/3 of the total protein in a mitochondrion. The matrix is important in ATP synthesis with the aid of the ATP synthase contained in the inner membrane. The matrix contains a highly concentrated mixture of hundreds of enzymes, special mitochondrial ribosomes, tRNA, and several copies of the mitochondrial DNA genome. Therefore, 2 is the answer.

Asked in: NEET 2019 (All India)

Practice more Cell The Unit of Life questions on Aicharya