Once I tried to learn this stuff by asking a biochemist, but I soon became frustrated because it seems there are no 100% rules, only "it is usually like this" all the way down.
Like, did they teach you at school that eukaryotes have two sets of chromozomes, one from each parent? Yeah, "usually". But then also: https://en.wikipedia.org/wiki/Polyploidy
And similarly with everything.
It should be noted that biological systems were one of the exlicit inspirations for extremely dynamic and object oriented languages like smalltalk.
Far from being a negative aspect the 'centerless' design and high degree of decentralization is messy, but also extremely robust.The internet as a whole is another example of a human technology that utilizes that sort of design.
The nature of biology is much like classes and data floating around and all seemingly randomly interacting with each other, because ultimately this is just chemistry with thousands of unique compounds, which makes things messy.
But through natural selection it seems to work. Like a totally incomprehensible compression algorithm learned by neural nets or evolved by genetic code. There should be a source somewhere around here...