Discussion
Consider the following statements about the endomembrane system.
1. The nuclear envelope is continuous with the endoplasmic reticulum.
2. Vesicles carry material between its compartments.
3. Mitochondria are part of the endomembrane system.
Answer: C
The first two are correct. Mitochondria are excluded because they import their proteins directly from the cytosol and exchange no vesicles with the rest of the system. Their double membrane and own DNA point to a separate endosymbiotic origin.
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