Practice question · Multiple choice
Peroxisomes carry out essential metabolic degradation yet sit outside the endomembrane system. What structural consequence follows directly from this distinction?
Hints
- How do peroxisomes acquire their protein machinery if not via vesicle traffic?
- What distinguishes the boundary of a standalone metabolic organelle from the connected endomembrane network?
Show the answer
A. They lack transport vesicles and must import proteins from the cytosol
Why
Being excluded from vesicle trafficking means peroxisomes cannot receive lumenal cargo from the rough ER or Golgi. Confusing their distinct direct-import mechanism with lack of compartmentalisation or shared enzyme pools overlooks how parallel organelle pathways operate in eukaryotic cells.
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