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The inner membrane of a mitochondrion is folded into

Athylakoids
Bmatrix
Cgrana
Dcristae
Answer & Solution
Correct answer: D. cristae
The inner mitochondrial membrane is thrown into folds called cristae. The folds pack more surface area for the electron transport chain. Thylakoids and grana belong to chloroplasts the matrix is the inner fluid of the mitochondrion.
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