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The folds of the inner mitochondrial membrane are called

  • A.cristae
  • B.thylakoids
  • C.grana
  • D.lamellae

Answer: A

Correct answer: cristae

The cristae are the infoldings of the inner mitochondrial membrane, and their number and depth track how much oxidative work the cell does - a cardiac muscle mitochondrion is packed with them. Thylakoids and grana belong to the chloroplast, which achieves the same end by a different geometry: stacked flattened sacs rather than folds.

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