Comment by captainmuon

This reminds me of something I always wanted to ask. Are the majority of molecules in the body "named" or "purposeful" molecules, like haemoglobin, vitamins, water, lipids, DNA, etc., or is there a lot of random stuff, where just some atoms are arranged arbitrarily? Ignoring for a second the trival thing that you can make really long polymers, you have mutations in DNA and so on - I would could those into the first case. What is the ratio of "encyclopaedic" molecules (discovered or not) to "random stuff" (useless or not)?