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Q.
The inner membrane of mitochondria forms a number of infoldings called
Cell : The Unit of Life
Solution:
The inner membrane of mitochondrion forms a number of infoldings called cristae.
While Cisternae $\rightarrow$ Long, flattened, parallel sac-like interconnected structures.
Microtubules $\rightarrow$ Cytoskeleton
Mesosomes $\rightarrow$ Invagination of plasma membrane of bacterial cell.