What does this sentence mean? I was reading the book: " Nanotechnology: A Gentle Introduction to the Next Big Idea" and I came across this sentence:


  For these molecules to perform useful functions, they must be easy to
  assemble and easy to recognize and bind to by other molecules.


Who can explain this sentence? I have problem with "easy to assemble and easy to recognize" part?

It was in the paragraph below:-


  Generally, the molecules found in nature are complex and the source of
  much dismay to beginning organic chemistry students. For these
  molecules to perform useful functions, they must be easy to assemble
  and easy to recognize and bind to by other molecules. They must also
  be made by biological processes and have variable properties.
I think the sentence means that the molecule the nanotechnician is using has to be quite easy for other molecules to interact with, either by chemically bonding to it or acting like a catalyst (or otherwise).