Indicate if each of the following descriptions matches lipids (1), nucleic acids (2), polysaccharides (3), or proteins (4). Your answer would be a four-digit number composed of digits 1 to 4 only, e.g. 1332.
( ) Their monomers contain phosphorus and nitrogen.
( ) They constitute almost half of the cell's dry mass.
( ) They are the main constituent of all cellular membranes.
( ) They are largely hydrophobic and can store energy.