Answer:
Your bloodstream.
Explanation:
The cells in your pancreas produce insulin which needs to be sent to the rest of your body to tell your cells to take in glucose (sugar) for energy. In order to get sent out of the pancreas' cells, the insulin needs to go through your bloodstream.
It is free to bind to another promoter and begin transcription.
Answer: The cell membrane is selectively permeable.
Explanation: going thru last year notes