alleryStart learning →In a mitochondrion, what are the folds of the inner membrane called and what do they enclose?
AGrana enclosing the stroma
BThylakoids enclosing the lumen
CCristae enclosing the matrix
DCisternae enclosing the cytosol
Answer & Solution
Correct answer: C. Cristae enclosing the matrix
1. A mitochondrion is an oval-shaped organelle with two membranes, each a phospholipid bilayer embedded with proteins.
2. The inner layer carries folds, and those folds are called cristae.
3. The area surrounded by the folds is the mitochondrial matrix.
4. Grana and thylakoids belong to the chloroplast, not the mitochondrion, so that pairing is misplaced.
5. The folds are cristae and they enclose the matrix.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 4 "Cell Structure", section 4.3 Eukaryotic Cells_
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