Which of the following statements regarding mitochondria is incorrect?
A
Mitochondrial matrix contains single circular DNA molecule and ribosomes
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B
Outer membrane is permeable to monomers of carbohydrates, fats and proteins
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C
Enzymes of electron transport are embedded in outer membrane
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D
Inner membrane is convoluted with infoldings
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Solution
The correct option is C Enzymes of electron transport are embedded in outer membrane Mitochondria is a double membrane bound cell organelle found in all the eukaryotic cells.
The outer membrane is smooth and is freely permeable to small molecules such as monosaccharides, fatty acids and amino acids (monomers of macromolecules). This is because it contains porins which form channels that allow the free diffusion of smaller molecules.
The surface of the inner membrane is convoluted with infoldings called cristae. Cristae increase the surface area of the inner membrane.
The enzymes of the electron transport are embedded in the inner mitochondrial membrane, and they are essential to the process of oxidative phosphorylation (a process that generates ATP).
The inner membrane encloses the matrix which contains single circular DNA and ribosomes.