Which macromolecule makes up the majority of the cell membrane?

Lipid and proteins

Explanation:

The cell membrane is a lipoprotein membrane. It is consist of lipids and proteins which are the macromolecules. The lipids forms the phospholipid molecules. This is an amphipathic molecule which has both hydrophobic and hydrophilic head.

There are 2 types of proteins are present in the cell membrane- extrinsic and intrinsic proteins. These proteins act as the carriers for different ions and molecules. They help in transportation of hormones, ions, minerals into and out of the cells.

There are some amount of carbohydrates present on the surface of the cell. They form glycocalyx membrane of many bacteria.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.