Practice question
Question
A mitochondrion retains both its outer and inner membranes, but the infoldings of its inner membrane become completely flattened. The matrix remains intact.
Which outcome is most consistent with this structural change?
Explanation
Cristae are infoldings that increase the surface area of the inner mitochondrial membrane, whose enzymes are associated with mitochondrial activity. Flattening them reduces this area. Matrix components such as circular DNA, RNA and 70S ribosomes need not be removed.
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