Which of the following statements regarding mitochondria is incorrect?
Answer: (B) Enzymes of electron transport are embedded in outer membrane.. Answer: (B) Enzymes of electron transport are embedded in outer membrane.
- A.Outer membrane is permeable to monomers of carbohydrates, fats and proteins.
- B.Enzymes of electron transport are embedded in outer membrane.✓
- C.Inner membrane is convoluted with infoldings.
- D.Mitochondrial matrix contains single circular DNA molecule and ribosomes.
Correct Answer
(B) Enzymes of electron transport are embedded in outer membrane.
Solution & Explanation
Answer: (B) Enzymes of electron transport are embedded in outer membrane. Solution: This statement is INCORRECT and hence the answer: the electron transport (respiratory) enzymes are embedded in the INNER mitochondrial membrane (whose cristae increase surface area), not the outer membrane. The other statements are correct — the outer membrane is permeable to small monomers, the inner membrane is convoluted into cristae, and the matrix contains a single circular DNA molecule and 70S ribosomes. NCERT Reference: Ch 8, p.97, lines 8–11: "The inner membrane forms a number of infoldings called the cristae (sing.: crista) towards the matrix (Figure 8.7). The cristae increase the surface area. The two membranes have their own specific enzymes associated with the mitochondrial function."