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publish date: 2026/06/15 06:28:28.277031 UTC
The mitochondrion has two membranes. The inner membrane is highly folded to increase surface area.
These inwardly directed folds of the inner mitochondrial membrane are called (1), and they extend into a semifluid (2).
Please drag and drop the selected option in the right place or type it instead
matrix
stroma
grana
cristae
Correct Answer
(1) cristae
(2) matrix
Explanation
The inner membrane of the mitochondrion has many inwardly directed folds called cristae, which extend into a semifluid matrix. It is along the cristae and in the matrix where the energy-transfer enzyme systems that manufacture ATP are found.
Reference
Biology: A Self-Teaching Guide