A fence around a building it keeps bad stuff and the other stuff in
Like an egg.
The function of the cell wall is to protect the cell from foreign objects =]
The outer layer of a cell is the cell membrane or plasma membrane
The cell wall is the outer-most layer, found outside the cell membrane. Animal cells only have a cell membrane, not a cell wall. Plant, bacteria, fungi and algal cells usually have a cell wall, as well as some archaea.
The cell wall in a plant cell maintains the shape of the plant cell. It also supports and protects the cell. Animal cells do not consist of cell walls they only have a cell membranes. Hope that helped :)
It could be a gate. It is a gate because the door is the cell membrane. See you need to get past the cell wall before the cell membrane.
a building
A prokaryote is a kingdom but it fits into into the Monera kingdom. Prokaryotes are molecules surrounded by membrane and cell wall.
The fence
I think the border of the city or like a fence or wall would be the best one I can think of.
If cell is a factory, mitochondria is its powerhouse
cell membrain: school doors, regulates traffic inside and out the school cell Wall: the school walls, protects the school cytoplasm: the air in the school that allows people to be there vacuole: closets of the school, stores stuff
You can relate a cell membrane to the school's office because they control who comes into the school. (i.e.: visitor's have to check in at the front office they can't just walk in without checking in)
The Fence because it keeps everything safe from the surrounding environment.
A good analogy for a cell wall is either a city wall which protects the city from attack and holds it together. or possibly a brick wall of a building. which supports the building, protects it from harsh elements and only allows materials to enter through certain entrances and exits.
A nickname for the cell wall is the barrior. It is also called "bricks for building" because it protects the cell and helps it maintain its shape.
A castle. hard outer wall, important nobles inside. protected by knights, etc.