I think I need to give biological components characters, like the cells in Once Upon A Time.... Life.
For example, enzymes can be blocked by non-competitive or competitive inhibitors.
Competitive Inhibitors attach to the enzyme where the enzyme normally binds to the molecule it usually catalyses (the active site). Non- competitive Inhibitors bind to some other part of the enzyme, but change the shape of the active site so the normal molecule it catalyses cannot attach.
I often think of this process in terms of when somebody is in a relationship with someone, but they don't really like them that much, they really fancy someone else. But the boyfriend or girlfriend they have acts as an competitive inhibitor by a blocking potential love between two people who really like each other.
An example of a non-competitive inhibitor might be when all parties are single, but one person has declared an attraction to another person. This declaration prevents another person from trying to form a relationship with them, so as not to compromise a friendship.
Illustration to come....
Other Character Ideas
A manic dopamine molecule, mediating addiction
Serotonin molecules after ecstasy comedown.
DNA- Transcription- Translation
An authoritative DNA molecule dictates instructions to RNA, a tired ribosome translates information from RNA to amino acids.