A cell is observed to have a defect in COP I protein function. Predict the impact this would have on vesicular transport.

• A. Transport between the Golgi and plasma membrane would be impaired.
• B. Transport from the ER to the Golgi would be impaired.
• C. Transport from the plasma membrane to the lysosome would be impaired.
• D. Transport from the Golgi to the ER would be impaired.

Answer: (D)