Small molecular subunits called ______ form chemical bonds to make larger polymers.

Step 3: Eliminate incorrect options by understanding their definitions: - Nucleotides are specific monomers that form nucleic acids like DNA and RNA, but they are not a general term for all small subunits. - Isomers are molecules with the same chemical formula but different structures, unrelated to forming polymers. - Enzymes are proteins that catalyze chemical reactions, not structural subunits.

Step 4: Recognize that 'monomers' is the correct term because it is the general name for small molecular subunits that bond to form polymers.