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The mannose-6-phosphate tag added in the Golgi directs a protein to the

  • A.cell exterior
  • B.lysosome
  • C.nucleus
  • D.mitochondrion

Answer: B

Receptors in the trans Golgi network recognise the tag and package the protein accordingly. A defect in adding it causes I-cell disease, in which the enzymes are secreted instead of being delivered. The lysosomes then fill with undigested material, which is what damages the tissue.

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