No, that's incorrect. A dehydration reaction that builds larger molecules from smaller units removes a water molecule.

Here's why:

* Dehydration: The name itself hints at the process. "Dehydration" means removing water.

* Building Larger Molecules: When smaller units (monomers) join to form larger molecules (polymers), a bond forms between them. To form this bond, a water molecule is released.

Example:

Think of building a chain with links. Each link represents a monomer. To connect two links, you need to remove a small piece from each link. In a dehydration reaction, that "small piece" is a hydrogen atom (H) from one monomer and a hydroxyl group (OH) from another monomer. These combine to form a water molecule (H2O), which is released.

Contrast with Hydrolysis:

* Hydrolysis is the opposite of dehydration. It breaks down large molecules into smaller units by adding a water molecule.

Let me know if you have any other questions!