If secretory proteins are isolated from secretory vesicles and injected into the cytosol, they will A. remain in the cytosol until they are degraded. B. be secreted through channels in the plasma membrane. C. be taken up into the rough ER and follow the secretory pathway. D. be taken up into secretory vesicles and secreted.

Answer: Option C

Explanation:

The secretory proteins are found inside the cell which is secreted by the Endoplasmic reticulum and moves from the same route towards the Golgi apparatus.

Although it is secreted from the endoplasmic reticulum of the cell, but if it is injected from the outside to the inside of the cell then it moves to the rough endoplasmic reticulum and follows the secretory pathway of the cell.

Hence, the correct answer is option C