In A Paragraph Please Explain What Reaction Occurs As You Break Down Those Macromolecules And The Reaction That

Question

In a paragraph, please explain what reaction occurs as you break down those macromolecules, and the reaction that

occurs when the monomers are used by your body to build new macromolecules for lipids, proteins and nucleic acids. I do not understand the material and would appreciate some sites to get more knowledge also

Science