Question

which macromolecule forms a double layer as the primary structure of cell membranes?
fats
oils
phospholipids
steroids

Explanation:

Cell membranes have a phospholipid - bilayer structure. Phospholipids have a hydrophilic head and hydrophobic tails, which arrange themselves in a double - layer to form the basic structure of the cell membrane. Fats, oils, and steroids do not form the primary double - layer structure of cell membranes.

Answer:

phospholipids