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The three kinds of molecules make up the cell membrane are:
 * 1) The Phospholipids
 * 2) The Proteins
 * 3) Carbohydrate strand

Phospholipids are arranged in a cell membrane because they are attracted to the watery surfaces so they are on the outside of the membrane.

The 3 different jobs the proteins do within a cell membrane are: First the membrane proteins they are like a gate which transports materials they also control the chemical reactions that happen in the cell they also help communicate with each other.

In the other book... The main purpose of the Cell Membrane is to let certain things in and out.

According to the book, a cell membrane is similar to a bubble

The Cell membrane located inside of the Cell Wall if there is a Cell Wall.

The difference between a Cell Wall and a Cell Membrane is that a cell wall is on a plant cell and a cell membrane is on any cell.