1. Dehydration Synthesis (or Condensation Reaction): This process builds macromolecules by removing a water molecule from two smaller monomers. The monomers then bond together to form a larger polymer.

2. Hydrolysis: This process breaks down macromolecules by adding a water molecule to the bond between two monomers. This breaks the bond, separating the monomers.

Here's a simple analogy:

* Dehydration Synthesis: Imagine building a chain by linking together individual links. To join each link, you need to remove a small piece of metal (representing water).

* Hydrolysis: Imagine taking apart that chain. You need to add a piece of metal (representing water) to each link to break the bond and separate them.

In summary:

* Dehydration Synthesis: Builds polymers by removing water.

* Hydrolysis: Breaks down polymers by adding water.