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In a prokaryotic cell, where does the Krebs cycle take place ?

  • A.The mitochondrion
  • B.The cytoplasm
  • C.The periplasmic space
  • D.The nucleoid

Answer: C

Correct answer: The cytoplasm

Bacteria have no mitochondria, so the Krebs cycle enzymes are dissolved in the cytoplasm. The electron transport chain, by contrast, is embedded in the plasma membrane, which is the prokaryotic counterpart of the inner mitochondrial membrane.

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