A plasma membrane and a cell wall

1. Are two names for the same thing

2. Have the same structure and different functions

3. Have different structures and the same function

4. Have different structures and different functions

Which one would it be?

4) Have different structures and different functions.

The plasma membrane is what regulates what comes in and out of a cell, and a cell wall is a sturdy structure in plant cells that give them there shape (ex. stems).

There structures are very similar, as they are both on the outside of a cell, by I wouldn't say that they're the same.