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Discussion

Consider the following statements about the secretory pathway.
1. Proteins move from the endoplasmic reticulum to the Golgi in vesicles.
2. The Golgi modifies proteins as they pass through its cisternae.
3. Proteins enter the Golgi at its trans face.

  • A.1 only
  • B.All of them
  • C.1 and 2 only
  • D.3 only

Answer: C

The first two are correct. The third reverses the geography: entry is at the cis face nearest the reticulum, and the trans face is where the finished products depart for their destinations. Traffic through the stack runs strictly one way.

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