Choose at least three different types of biological molecule having at least two functional groups and argue the case for a study of simple molecules being relevant to the study of larger, biological molecules

Choose at least three different types of biological molecule having at least two functional groups and argue the case for a study of simple molecules being relevant to the study of larger, biological molecules.

the explanation has to be long please and please don't just copy and paste because i need a brief and long explanation and if i could understand it my self from google i wouldn't have come here. i won't be using your work as mine i will just use it as a guide and then make it into my own words.