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Which of the following is NOT a cell organelle?

  • A.Ribosome
  • B.Lysosome
  • C.Microsome
  • D.Mitochondria

Answer: C

Microsome is not a cell organelle. Microsomes are small vesicles that form from fragments of the endoplasmic reticulum when cells are broken up in the laboratory, so they are artefacts of preparation and do not exist as organelles in the living cell. Ribosomes make proteins, lysosomes digest waste, and mitochondria produce energy as ATP, and all three are true cell organelles. So the microsome is the one that is not an organelle.

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