Question

a hydrocarbon chain that is sometimes considered to be a monomer of lipids. options: lipids, proteins, nucleic acids, fatty acids.

Explanation:

The question is about identifying the monomer (building block) of lipids. Lipids' monomers are fatty acids (and glycerol, but among the options, fatty acids are the monomer - related option here). Lipids are made up of fatty acid chains (and glycerol in triglycerides, for example), while proteins are made of amino acids, nucleic acids of nucleotides, and fatty acids are the monomer - like units for lipids.

Answer:

Fatty Acids