volume_mute
Complete the sentence:
publish date: 2026/06/15 08:00:37.768443 UTC
The inner membrane of the mitochondrion is highly folded to increase the surface area available for energy-transfer reactions.
These folds 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
stroma
matrix
grana
cristae
Correct Answer
(1) cristae
(2) matrix
Explanation
The inner mitochondrial membrane folds inward to form cristae, which greatly increase the surface area for ATP synthesis. These cristae extend into a semifluid matrix. Both the cristae and matrix contain the energy-transfer enzyme systems responsible for manufacturing ATP.
Reference
Biology: A Self-Teaching Guide