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Which part of mitochondria has almost 70-75% protein content?

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Which part of mitochondria has almost 70-75% protein content?

(a) Outer membrane

(b) Inner membrane

(c) Both outer and inner membrane

(d) Intermembrane space

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Question is from Mitochondrial Structure and Function topic in division Mitochondrial Structure and Function of Cell Biology

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The correct choice is (b) Inner membrane

Easy explanation: The outer membrane of mitochondria is composed of approximately 50% lipid by weight and contains a mixture of different enzymes. The inner membrane contains more than 100 different polypeptides and has a very high protein to lipid ratio. The protein content exceeds 70% by weight.

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