INTRODUCTION TO MICROSCOPY CELL BIOLOGY
MITOCHONDRIA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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To make proteins
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to hold ribosomes and DNA
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To make oxygen
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Increase the surface area of the inner membrane
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Detailed explanation-1: -Mitochondrial cristae are the folds within the inner mitochondrial membrane. These folds allow for increased surface area in which chemical reactions, such as the redox reactions, can take place.
Detailed explanation-2: -The reason mitochondrial membranes need a high surface area is because the process of using oxygen to make energy is carried out on this membrane. The larger the surface area of this membrane, the more room for the membrane-bound cellular machinery that uses oxygen to make energy.
Detailed explanation-3: -The surface area per crista is 240 nm × 20 nm × 4 + 20 × 20 nm2 or 1.96 104 nm2. Thus the surface area of the inner membrane is 1.96 104 × 294 or 5.76 106 nm2, which is about three times larger than the surface area of the outer member, 1.98 106 nm2.